СПОСОБ ОПРЕДЕЛЕНИЯ ИЗМЕНЯЮЩИХСЯ ВО ВРЕМЕНИ ТЕРМОМЕХАНИЧЕСКИХ НАПРЯЖЕНИЙ И/ИЛИ ГРАДИЕНТОВ НАПРЯЖЕНИЯ ПО ТОЛЩИНЕ СТЕНОК МЕТАЛЛИЧЕСКИХ ТЕЛ

Использование: для определения изменяющихся во времени термомеханических напряжений и/или градиентов напряжения по толщине стенок металлических тел, в частности трубопроводов. Сущность изобретения заключается в том, что измеряют температуру на наружной поверхности тела для определения на ее основании температурной последовательности и последовательности напряжений. Кроме того, электромагнитные ультразвуковые преобразователи используют по меньшей мере в одном месте измерения на наружной поверхности для определения изменения напряжений и/или градиентов напряжения с течением времени по толщине стенок тела вместе с результатом измерения температуры. Технический результат: обеспечение возможности контроля усталости трубопроводов в случае быстрых изменений напряжения. 6 з.п. ф-лы, 7 ил.

СПОСОБ ИЗМЕРЕНИЯ ВИБРАЦИОННЫХ НАГРУЗОК НА ДВИГАТЕЛЕ ЛЕТАТЕЛЬНОГО АППАРАТА

Изобретение относится к метрологии, в частности к способам вибрационной диагностики. Способ измерения вибрационных нагрузок на двигателе летательного аппарата предполагает измерение вибраций с последующим определением спектральной плотности мощности ускорения вибрационного процесса W(f), рассчетом интегральной характеристики Q(f), представляющей накопленную по частоте площадь под кривой спектральной плотности мощности. Затем определяют амплитудные уровни и частоты вибрационных нагрузок путем выбора частот с пиковыми уровнями спектральной плотности в W(f) и выявления скачкообразных приращений Δординат площади. Определяют амплитуды ускорения по результатам приравнивания каждой Δна частотах fк среднему значению квадрата амплитудыгармонического колебания. Все остальные частоты, где отсутствуют скачкообразные приращения, относят к случайным составляющим измеренного вибрационного процесса с уровнями полученной спектральной плотности мощности. Сопоставляют их с аналогичными параметрами, установленными ...

Способ определения оптимальных размеров и количества уравнительных рельсов и ремонтных звеньев бесстыкового железнодорожного пути

Изобретение относится к области исследования напряженно-деформированного состояния упругих объектов. Способ определения оптимальных размеров и количества уравнительных рельсов и ремонтных звеньев бесстыкового железнодорожного пути заключается в том, что осуществляют построение геометрически подобных физических моделей участков соединений рельсовых плетей и уравнительных рельсов посредством компенсационных накладок, создают конечно-элементные модели построенных физических моделей. При этом варьируют длины и количество уравнительных рельсов. Создают геометрически подобные физические и конечно-элементные модели для каждой длины уравнительных рельсов, нагружают указанные модели нагрузками. Измеряют на физических моделях и рассчитывают на конечно-элементных моделях частоты и амплитуды максимальных резонансных колебаний параметров напряженно-деформированного состояния. Сравнивают полученные значения на близких по величине частотах и выбирают ту физическую и конечно-элементную модель, у которой ...

МОНИТОРИНГ ИНФРАСТРУКТУРЫ ТРАНСПОРТНОЙ СЕТИ

... 1. Способ мониторинга состояния конструкции, образующей часть транспортной сети, содержащий этапы, на которыхосуществляют распределенное акустическое зондирование на одном или нескольких оптических волокнах, размещенных так, чтобы осуществлять мониторинг упомянутой конструкции, для выдачи сигнала измерения из каждого из множества акустических чувствительных элементов;анализируют сигналы измерения, генерируемые от движения транспорта по транспортной сети вблизи упомянутой конструкции, для выявления акустических сигналов, связанных с упомянутой конструкцией; ианализируют акустические сигналы, связанные с упомянутой конструкцией, для обеспечения индикации любых изменений в состоянии упомянутой конструкции.2. Способ по п. 1, в котором при анализе акустических сигналов, связанных с упомянутой конструкцией, сравнивают упомянутые акустические сигналы с ранее полученными акустическими сигналами.3. Способ по п. 1 или 2, в котором при анализе акустических сигналов, связанных с упомянутой конструкцией ...

SCHAUFELANOMALIE-ERFASSUNGSVORRICHTUNG, SCHAUFELANOMALIE-ERFASSUNGSSYSTEM, ROTATIONSMASCHINENSYSTEM UND SCHAUFELANOMALIE-ERFASSUNGSVERFAHREN

Eine Schaufelanomalie-Erfassungsvorrichtung weist eine Vibrationserlangungseinheit (52), die eine Vibration einer Dampfturbine erlangt, wenn sich eine Drehzahl eines Rotors zusammen mit der Drehzahl ändert, eine Frequenzanalyseeinheit, die eine Frequenzanalyse gemäß einem Erlangungsergebnis der Vibrationserlangungseinheit (52) durchführt und bei jeder Drehzahl einer Rotorschaufelreihe eine Eigenfrequenz erlangt, eine Kontaktdrehzahlerlangungseinheit (54), die eine Kontaktdrehzahl erlangt, die als eine Grenze zwischen einem Zustand, bei dem Abdeckungen benachbarter Rotorschaufeln miteinander in Kontakt stehen, und einem Zustand, bei dem die Abdeckungen gemäß einem Analyseergebnis der Frequenzanalyseeinheit voneinander beabstandet sind, dient, und eine Bestimmungseinheit (55), die bestimmt, ob die Rotorschaufelreihen gemäß der von der Kontaktdrehzahlerlangungseinheit (54) erlangten Kontaktdrehzahl abnormal ist oder nicht, auf.

System und Verfahren zur Überwachung von mechanisch gekoppelten Strukturen

Es wird ein System und ein Verfahren zur Überwachung einer mechanisch gekoppelten Struktur (101, 403, 502, 506, 602) vorgestellt mit einem ersten Sensor (102), der ausgebildet ist, um seine Orientierung relativ zur Erdrotationsachse (202) zu vorgegebenen Zeitpunkten als erstes Messergebnis zu bestimmen, wobei der erste Sensor (102) mit einem ersten Teil der mechanisch gekoppelten Struktur (101, 403, 502, 506, 602) verbindbar ist, mit mindestens einem zweiten Sensor (104, 402, 504, 604), der bei Inbetriebnahme des Systems in einer bekannten ersten Orientierung zum ersten Sensor (102) steht und dazu ausgebildet ist eine Drehrate oder eine Beschleunigung als zweites Messergebnis zu ermitteln, wobei der mindestens eine zweite Sensor (104, 402, 504, 604) mit einem zweiten Teil der mechanische gekoppelten Struktur (101, 403, 502, 506, 602) verbindbar ist, mit einer Zentraleinheit (106), und mit einem Kommunikationsnetzwerk (108), über das die Zentraleinheit (106) mit dem ersten Sensor (102) und ...

Verfahren zum Erkennen von störenden Schwingungen

Verfahren zum Erkennen von durch äußere Einwirkung stoßartig oder spontan angeregten, um den Wert Null mit einer bauteiltypischen Frequenz oszillierenden Schwingungen, insbesondere von Torsionsschwingungen in einem Antriebsstrang eines Kraftfahrzeugs. Um in einem Signal, das die Schwingungen enthält, Schwingungen in einem vorher bestimmten Frequenzband schnellstmöglich zu erkennen und die Information Schwingung erkannt bereitzustellen, werden die Schwingungen, die erkannt werden sollen, durch bauteiltypische Frequenzgrenzen und vorgebbare Mindestamplituden charakterisiert, während Schwingungen, die eine geringere Schwingungsamplitude und eine höhere Frequenz aufweisen, nicht als Schwingung erkannt beurteilt werden. Wenn die Information Schwingung erkannt bereitgestellt wird, dann wird eine Steuerschaltung angesteuert, um ein Gegensteuern gegen die erkannte Schwingung zur zumindest teilweisen Kompensation derselben einzuleiten.

Testverfahren und Testvorrichtung für einen Fahrradgepäckträger

Ein Testverfahren für einen Fahrradgepäckträger (20), an dem ein Fahrradkindersitz (30) befestigt werden kann, umfasst die Verfahrensschritte des Durchführens eines Fahrradgepäckträger-Belastungstests mit dem Fahrradgepäckträger (20) und des Durchführens eines Fahrradkindersitz-Belastungstests mit dem Fahrradgepäckträger (20). Eine entsprechende Testvorrichtung (50) ist dazu geeignet ein derartiges Testverfahren durchzuführen.

SMART-SKIN STRUKTUREN

Determination of a physical condition of a pole-type structure

A system and method for determining a physical condition of a pole-type structure (which may be a bollard) is described. The system comprises: an impulsive source (for example, a hammer with in-built accelerometer) for emitting a first frequency signal into the pole-type structure; one or more sensors (for example, accelerometers), coupled to the pole-type structure for detecting a second frequency signal; and a data acquisition module, for processing the second frequency signal based on the first frequency signal. A sensor for determining a physical condition of a marine mooring bollard is also described.

Fatigue testing of a wind turbine blade

Wind Turbine Monitoring

A method of monitoring the performance of a wind turbine 1 uses bending moment data from strain sensors 4 in the turbine blades 2 to calculate rotational speed of the turbine 1, angular position of the turbine blades 2, angle of inclination of the turbine blades about an axis extending radially from the rotor by comparison of the components of mechanical strain in two non-parallel directions, drive torque and resultant load on the rotor 3. The method has the advantage that the inputs to the drive train of the wind turbine can be measured directly.

System and method for monitoring bending of a flexible riser

A system and method for monitoring bending curvature of a flexible pipe structure, including at least one conduit configured to conform to a profile of a bend stiffener of a flexible pipe structure, and the at least one conduit including one or more sensors, wherein each sensor is configured for measuring a bending curvature of the bend stiffener.

Fatigue testing of a wind turbine blade

The application relates to an apparatus (100) for fatigue testing a wind turbine blade specimen (10), and to a method using such an apparatus (100). The apparatus (100) comprises first and second support assemblies (120, 130) and an actuator (140) for cyclically deflecting the specimen (10) in a first transverse direction. The first and second support assemblies (120, 130) comprise first and second holders (121, 131) for holding first and second ends (12, 14) of the specimen (10), respectively, such that the longitudinal direction (16) of the specimen (10) extends between the first and second holders (121, 131). The first and second support assemblies (120, 130) are arranged such that the first and second holders (121, 131) are rotatable about a second transverse direction perpendicular to the first transverse direction and to the longitudinal direction (16) of the specimen (10).The first support assembly (120) is further arranged such that the first holder (121) is moveable in the longitudinal ...

A method for detecting degree of development of asphalt pavement fracture based on infrared thermal image analysis

A method for leakage detection of underground corridor based on static infrared thermal image processing

Method and system for structural health monitoring of bonded joints

Wireless passive sensing unit

A method for detecting degree of crack development of asphalt pavement

A method for detecting crack development degree index of asphalt pavement

A method for detecting crack development degree index of asphalt pavement based on infrared thermal image analysis, comprising; establishing a model for crack development degree detection; collecting IR thermal images of a fracture zone of pavement and recording ambient temperature; processing the IR images and obtaining measured temperature difference data between crack samples in said fracture zone and pavement surface; obtaining reference temperature difference data by introducing the ambient temperature into said model; and obtaining crack development degree index by introducing said reference temperature difference data and said measured temperature difference data into said model.

Handhabungsvorrichtung und Verfahren zum Erkennen eines Zustandes

Handhabungsvorrichtung zur Handhabung von Gegenständen, wobei ein Endstück (12) der Handhabungsvorrichtung in Form eines Aufnahme- und/oder Übernahmekopfes über wenigstens einen Antriebsstrang (14) mittels eines Riemens (4, 9) bewegbar ist und wenigstens ein Sensor (6) zum Erfassen einer Istgröße eines kinematischen Parameters des Endstückes (12) und/oder einer anderweitigen durch den Antriebsstrang (14) bewegbaren Komponente der Handhabungsvorrichtung (1) vorgesehen ist, wobei eine mit dem wenigstens einen Sensor (6) signalleitend verbundene oder verbindbare Auswerteeinheit (15) vorgesehen ist, die dazu ausgebildet ist, aufgrund der durch den wenigstens einen Sensor (6) gemessenen Signale eine Schwingung des Riemens (4, 9) festzustellen.

PROCEDURE AND SYSTEMS FOR THE MONITORING OF THE FIXED WINDING OSCILLATION

PROCEDURE FOR DETERMINING THE QUALITY OF BALL RACQUETS.

Monitoring the structural health of columns and like structures

... apparatus for monitoring the structural health of a column or a stock of columns or a column or columns within that stock is dosclosed in the application. The apparatus comprises a microcontroller located on the or each column which includes an integrated MEMS device programmed to measure and record accelerations, angular velocities and magnetic field strengths in X, Y and Z axes. The apparatus includes means for connecting said microcontroller to a source of power, and means operable to transmit said measured data to a central data hub and from there to a remote server for analysis using bespoke software.

Smart skin structures

Comprehensive assessment system and assessment method for vibration and load of wind generating set

The invention discloses a comprehensive assessment system and a comprehensive assessment method for vibration and load of a wind generating set. The system comprises a 5 wind generating set model simulation module, which is configured to simulate a wind generating set model to acquire wind generating set model simulation data; a wind generating set sample assessment module, which is configured to assess wind generating set samples to 10 acquire wind generating set sample assessment data; a wind generating set assessment module, which is configured to assess the vibration and the load of the wind generating set to acquire wind generating set assessment data; and a wind generating set expert analysis system, which is 15 configured to analyze the wind generating set sample assessment data, the wind generating set model simulation data and the wind generating set assessment data to acquire an assessment result. The invention can be used for accurately testing, analyzing and assessing the load ...

Method and system for pipeline condition analysis

A method and system for assessing the condition of a pipeline in a pipeline system is disclosed. The method includes generating a pressure wave in the fluid being carried along the pipeline system at a generation location along the pipeline system, detecting a first pressure wave interaction signal at a first measurement location along the pipeline system resulting from an interaction of the pressure wave with localised variations in the pipeline and then detecting synchronously a second pressure wave interaction signal at a second measurement location along the pipeline system resulting from the interaction of the pressure wave with localised variations in the pipeline. The method then involves comparing the first and second pressure wave interaction signals to determine a location of individual features in the first and second pressure wave interaction signals with respect to the generation location, the individual features corresponding to pressure wave reflections from localised variations ...

Method for vibration analysis

PIPE SENSORS

Methods, systems, and apparatuses are provided for detecting and determining conditions of and conditions within a fluid conduit.

METHODS FOR HANDLING A MOBILE PLATFORM IN A TANK CONTAINING NON-CONDUCTIVE HAZARDOUS SUBSTANCES

A mobile platform uses a charge accumulation control system to control a charge accumulation while the mobile platform is in the tank. Alternatively or additionally, the mobile platform includes a retrieval system having a buoyant body, a primary tether, and a secondary tether. Alternatively or additionally, an electrical cable is used to reduce a voltage difference between the mobile platform and the tank or other structure by electrically connecting to an electrically conductive member on the mobile platform.

NON-DESTRUCTIVE TESTING OF THE LINING OF A PROCESS VESSEL

... ²²²A process for the non-destructive testing of a refractory lined process vessel ²comprising the steps of: (a) striking an external wall of a process vessel ²internally lined with a refractory material with an impulse hammer; (b) ²measuring selected frequency characteristics of the refractory lined process ²vessel; and (c) analysing the measured frequency characteristics and ²determining the integrity of the internal lining of refractory material from ²said measured frequency characteristics.² ...

METHOD FOR MONITORING THE LOAD ON ROTOR BLADES OF WIND ENERGY INSTALLATIONS

The invention, which relates to a method for monitoring the load on rotor blades of wind energy installations by means of acceleration measurements o n at least one rotor blade of a wind energy installation and the determinati on of the load on the rotor blade from the picked-up acceleration signals, i s based on the object of specifying a method with which dynamic, even uncrit ical load states can be detected, in differentiated fashion, and combined in a suitable form for evaluation in order to influence, if possible prior to the onset of damage to the rotor blade, the mode of operation of the wind en ergy installation, in particular the design of the pitch control or angle se tting of stall-regulated rotor blades, on the basis both of all of the rotor blades together and of a single rotor blade. This problem is solved by the frequency of the occurrence of the load values over a certain period of time being determined from the amplitudes of the time signal or the amplitudes o f selected ...

AUTOMATED STRUCTURAL INTERROGATION OF AIRCRAFT COMPONENTS

A structural health monitoring system and method includes a plurality of sensors configured to collect sensed data, a first structural component, and a controller configured to receive the sensed data and detect a first condition based upon the sensed data. The controller is further configured to initiate a first structural interrogation of the first structural component upon detection of the condition.

METHOD FOR DETECTING TEMPORALLY VARYING THERMOMECHANICAL STRESSES AND/OR STRESS GRADIENTS OVER THE WALL THICKNESS OF METAL BODIES

The present invention relates to a method for detecting temporally varying thermomechanical stresses and/or stress gradients over the wall thickness of metal bodies (1), in particular pipelines. In the method, the temperature on the outer surface of the body (1) is measured in order to determine a temperature progression and stress progression therefrom. In addition, electromagnetic ultrasonic transducers (3-6) are used at at least one measuring point on the outer surface in order to determine the progression of the stresses and/or stress gradients over time over the wall thickness of the body (1) in conjunction with the result of the temperature measurement. The method allows the fatigue monitoring of pipelines even in the event of rapid stress changes.

METHOD FOR DETERMINING A STRUCTURAL STATE OF A MECHANICALLY LOADED UNIT

The present invention relates to a method for determining a structural state of at least one component of a mechanically loaded target unit, in particular a target unit of a rail vehicle, the method comprising, in an actual excitation step (109.4) of an evaluation cycle (109.3), introducing a defined actual mechanical input signal into the target unit (105.1), in an actual capturing step (109.5) of the evaluation cycle (109.3), capturing an actual mechanical response signal of the target unit (105.1) to the mechanical input signal, and, in an actual evaluation step (109.6) of the evaluation cycle (109.3), comparing the actual mechanical response signal to a previously recorded baseline signal to establish an actual differential feature and using the actual differential feature to determine the structural state. The baseline signal is representative of a previous mechanical response signal of the target unit (105.1) to a previous mechanical input signal, the previous mechanical input signal ...

PROCEDURE FOR DETERMINING THE QUALITY OF BALL RACQUETS.

SYSTEM AND METHOD FOR REMOTE MONITORING INTEGRITY OF PIPES UNDER PRESSURE BY MEANS OF VIBROACOUSTIC SOURCES

Photodynamic tunnel

VIBRATORY TEST DEVICE FOR TURBINE BLADES OF A TURBOMACHINE

A METHOD FOR CONTROLLING the STATIC STABILITY Of a CONCRETE FOUNDATION Of UNPYLONE OF AIR LINES

PROCESS AND SYSTEM TO SUPERVISE (MONITORING) the BEHAVIOR Of UNETUYAUTERIE CONTAINING a FLUID UNDER PRESSURE

NONDESTRUCTIVE INSPECTING DEVICE Of a STRUTURE BY VIBRATORY ANALYSIS

Process and testing apparatus of the body of vehicles

METHOD OF DETERMINING THE THRESHOLD RF NON-PROPAGATING FATIGUE CRACK

AND PROCEEDED TOGETHER OF MONITORING TO DETECT STRUCTURAL DEFECTS BEING ABLE TO APPEAR IN a NACELLE Of AIRCRAFT

PROCESS OF MEASUREMENT OF the DYNAMIC PROPERTIES Of a MECHANICAL STRUCTURE

METHOD FOR PRODUCING A VIBRATION FATIGUE TEST OF A MECHANICAL PART

STRUCTURAL SENSOR FOR AIR VEHICLES

Method for determining validation profile of part that is fixed on motor and subjected to vibrations, involves obtaining density by calculating density from corrected effective displacement value by utilizing transfer function

L'invention concerne un procédé d'obtention d'une densité spectrale de puissance d'accélération d'un processus stationnaire, gaussien, à bande étroite, à partir d'un spectre de dommage par fatigue, comprenant une étape de calcul de la valeur efficace de déplacement d'un oscillateur harmonique à partir du spectre de dommage par fatigue, suivi d'une étape d'estimation d'une densité spectrale de puissance d'accélération approchée, en utilisant une fonction de transfert simplifiée, à partir de la valeur efficace de déplacement. Selon l'invention, le procédé comprend une étape de calcul de la valeur efficace de déplacement de la densité spectrale de puissance d'accélération approchée, une étape de comparaison des deux valeurs efficaces de déplacement, une étape de calcul d'une valeur efficace de déplacement corrigée à partir de la comparaison des valeurs efficaces de déplacement de sorte que la valeur efficace de déplacement calculée à partir du spectre de dommage par fatigue soit borné par ...

Process and testing device applicable mainly to the material of aviation

Improvements brought to the processes and devices to determine rigidity or solidity, even tiredness, of a metal or different work

Diagnostic instrumentation for concrete art object - has shock generator with steel projectile bombarding object surface while piezoelectric accelerometer and optoelectronic displacement sensors detect shock waves and transmit information to measuring bridge

MEMS 센서를 이용한 구조물의 안전 모니터링 시스템 및 안전 진단방법

... 본 발명은 MEMS 센서를 이용한 구조물의 안전 모니터링 시스템 및 안전 진단방법 관한 것이다. 보다 구체적으로, 가속도 센서, 자이로 센서, 콤파스 센서 및 고도계 센서를 포함하는 MEMS 센서에서 감지된 신호를 통해 구조물의 각변위 및 구조물에 가해지는 진동을 도출하고, 각변위 변화에 따른 구조물의 상태를 진단할 수 있는 안전진단 방법에 관한 것이다.

System for Measuring Deflection of Bridge Plate and Vibration Freqency

AN INTEGRITY MONITORING SYSTEM AND A METHOD OF MONITORING INTEGRITY OF A STATIONARY STRUCTURE

The invention concerns an integrity monitoring system for monitoring integrity of at least a part of a stationary structure. The system comprises a vibration sensor for sensing vibration as a function of time, a computer, transmitting means for transmitting vibration data from the vibration sensor to the computer, means for acquiring position as a function of time data of a movable object, such as a vessel, a vehicle or a digging tool, where the movable object comprises a transmitter,and transmitting the position as a function of time data to the computer when the movable object is within a selected distance to a monitoring site. The monitoring site comprises the part of the stationary structure to be monitored and the vibration sensor is arranged to sense vibrations within the monitoring site. The computer comprises hardware and software for comparing the vibration data with the position as a function of time data.

SENSOR NETWORK AND STATE MONITORING DEVICE FOR AN AIRCRAFT AND STATE MONITORING METHOD

The invention relates to a sensor network for measuring environmental parameters on the structure of an aircraft. For this purpose, a plurality of sensor units (12) is fastened on the structure of an aircraft, with which identifiers are associated for localization of the sensor units (12).

TEST APPARATUS AND OSCILLATORY MASS ARRANGEMENT FOR A ROTOR BLADE OF A WIND ENERGY INSTALLATION

The invention relates to a test apparatus (5, 5', 5'') for a rotor blade (3) of a wind energy installation, having an eccentric (8) which can be driven by a motor (10), at least one set of load scissors for fastening the test apparatus (5, 5', 5'') to the rotor blade (3) and means for transmitting the inertial forces of the eccentric (8) to the at least one set of load scissors. The invention also relates to an oscillatory mass arrangement having a mass body (13, 13') and fastening means for fastening the oscillatory mass arrangement to a rotor blade (3). The invention is characterized in that the test apparatus (5, 5', 5'') comprises a rocker (15) which is fastened, by means of a bearing, to a body bearing the weight force of the test apparatus (5, 5', 5''), in that the motor (10) and the eccentric (8) are arranged on the rocker, and in that the rocker (15) is connected to the at least one set of load scissors via a coupler. The invention is also characterized in that the oscillatory mass ...

System for in-situ delamination detection in composites

In a system for in-situ delamination detection in composites, the invention employs a system which evaluates the mechanical vibration response of composite material structures. The damping characteristics of the composite structure are extracted from the detected wave properties generated by imbedded piezoelectric ceramic actuators and received by imbedded high strain sensitive fiber optic sensors. Such a sensor system is simple to operate for real-time non-destructive strain and displacement monitoring and delamination detection, without the need to remove the tested surface from operation. During the routine structural integrity monitoring operation, mechanical vibration pulses are launched into the composite from one actuator. The strain signal's propagation patterns are measured in real time by the fiber-optic sensors at different grating locations. Different travel times are computed dependent on the location of the receiving gratings. Propagation of the waves through a delaminated ...

Active damage interrogation method for structural health monitoring

An active damage interrogation (ADI) system (and method) which utilizes an array of piezoelectric transducers attached to or embedded within the structure for both actuation and sensing. The ADI system actively interrogates the structure through broadband excitation of the transducers. The transducer (sensor) signals are digitized and the transfer function of each actuator/sensor pair is computed. The ADI system compares the computed transfer function magnitude and phase spectrum for each actuator/sensor pair to a baseline transfer function for that actuator/sensor pair which is computed by averaging several sets of data obtained with the structure in an undamaged state. The difference between the current transfer function and the baseline transfer function for each actuator/sensor pair is normalized by the standard deviation associated with that baseline transfer function. The transfer function deviation for each actuator/sensor pair is then represented in terms of the number of standard ...

GAS TURBINE ENGINE VANE EMBEDDED BEAM INTERRUPT OPTICAL TIP-TIMING PROBE SYSTEM

A method of observing an airflow passage within a gas turbine engine includes locating a support in view of an airflow passage and housing an optical fiber within the support.

Methods for Maintaining Difficult-to-Access Structures Using Unmanned Aerial Vehicles

Methods for performing maintenance operations using unmanned aerial vehicles (UAVs). The methods are enabled by equipping a UAV with a maintenance tool capable of performing a desired maintenance operation (e.g., nondestructive inspection) on a limited-access surface of a large structure or object (e.g., a wind turbine blade). The UAV uses re-orientation of lifting means (e.g., vertical rotors) to move the maintenance tool continuously or intermittently across the surface of the structure while maintaining contact with the surface of the structure undergoing maintenance. 1. An unmanned aerial vehicle comprising:a frame comprising a plurality of standoff support members and a plurality of tool support members;a plurality of rotor motors coupled to the frame;a plurality of rotors coupled to respective rotor motors of the plurality of rotor motors;a plurality of motor controllers for controlling operation of the respective rotor motors of the plurality of rotor motors;a plurality of standoff contact elements coupled to distal ends of respective standoff support members of the plurality of standoff support members; and a maintenance tool supported by the plurality of tool support members in a fixed position relative to the plurality of standoff contact elements.2. The unmanned aerial vehicle as recited in claim 1 , wherein the plurality of standoff contact elements comprise first through fourth ball rollers or first through fourth wheels or have surfaces suitable for sliding along a surface of a structure.3. The unmanned aerial vehicle as recited in claim 1 , wherein the maintenance tool is a nondestructive inspection sensor unit.4. The unmanned aerial vehicle as recited in claim 1 , wherein the maintenance tool is a sensor array.5. The unmanned aerial vehicle as recited in claim 1 , wherein the plurality of rotors comprise a first rotor having a first axis of rotation that is vertical when the unmanned aerial vehicle is level and a second rotor having a second axis of ...

DEVICE AND METHOD OF VERIFYING PROTECTIVE CASE USAGE

A device and method of verifying protective case usage, is described. The device includes one or more processors to drive an electromechanical transducer with an input signal. The electromechanical transducer generates an input force based on the input signal, and a sensor of the device generates a test output signal in response to the input force. The one or more processors determine, based on the test output signal, a level of verification that a protective case is mounted on the device. The determination can include determining whether the test output signal matches a predetermined impulse response signal indicative of an unprotected device or a protected device. A digital identification tag of the protective case can be read by a radio-frequency transceiver of the device to provide an additional level of verification that the protective case is mounted on the device. Other aspects are described and claimed.

METHOD AND DEVICE FOR ANALYSING A STRUCTURE

A method for analyzing a structure, including a measurement of a duration T, a mechanical S or acoustic energy Sacand/or a spatial extension ξ of a sequence and/or a number of mechanical or acoustic events N or Nacin that sequence and/or of the mechanical A or acoustic Aacenergies of the events of that sequence, and/or a measurement of a mechanical energy A or acoustic energy Aacof an event, and/or of a temporal frequency of mechanical events dN/dt or acoustic events dNac/dt, and/or of a dissipated mechanical energy rate dE/dt or of an acoustic energy rate dEac/dt at the time of that event, and according to the measurement of an event and/or the measurement of a sequence of events, a calculation by technical means of a data r representative of a state of health of the structure or of a time tcto failure of the structure.

МОНИТОРИНГ ИНФРАСТРУКТУРЫ ТРАНСПОРТНОЙ СЕТИ

Изобретение относится к области измерительной техники, в частности к мониторингу технического состояния конструкций, в частности туннелей. Описанный способ включает осуществление распределенного акустического зондирования на одном по меньшей мере оптическом волокне, размещенном так, чтобы осуществлять мониторинг конструкции. Акустическую реакцию на движение транспорта по сети вблизи упомянутой конструкции обнаруживают и подвергают анализу, чтобы определить акустическую реакцию конструкции. Затем акустическую реакцию конструкции подвергают анализу, чтобы определить любое изменение в состоянии. Упомянутый способ использует обычное движение транспорта по сети, например поездов по железнодорожной сети, для акустического возбуждения конструкции и обнаружения результирующей реакции. Технический результат заключается в возможности обеспечения непрерывного мониторинга состояния конструкций транспортной инфраструктуры. 5 н. и 17 з.п. ф-лы, 8 ил.

СПОСОБ И УСТРОЙСТВО ЧАСТОТНОГО АНАЛИЗА ДАННЫХ

Группа изобретений относится к частотному анализу данных. В частности, к анализу данных испытаний самолетов на допуск к области полетных режимов. Способ частотного анализа данных, отличающийся тем, что содержит: этап (310) ввода сигналов, поступающих от первого датчика, этап (315) ввода сигналов, поступающих, по меньшей мере, от второго датчика, при этом каждый второй датчик расположен вблизи первого датчика, чтобы сигналы, поступающие от каждого второго датчика, были сильно коррелированными с сигналами, поступающими от первого датчика, этап оценки для каждого датчика передаточной функции или модели, реализуемой на основании совокупности сигналов от первого датчика и от каждого второго датчика, и этап (320) извлечения структурных свойств системы на основании каждой из оценочных моделей. Также заявлен компьютерный программный продукт, реализующий способ. 2 н. и 17 з.п. ф-лы, 10 ил.

Система для мониторинга искусственных сооружений высокоскоростной магистрали

Изобретение относится к мониторингу на искусственных сооружениях высокоскоростных магистралей. Технический результат - повышение достоверности оценки состояния искусственных сооружений высокоскоростной магистрали. Система содержит блок мониторинга опор, включающий двухосевые датчики наклона опор и трехосевые датчики вибрации, блок мониторинга пролетных строений, включающий двухосевые датчики наклона пролетных строений и трехосевые датчики вибрации, блок мониторинга верхнего строения пути, включающий датчики линейного перемещения рельсов, рельсовых плит и балок, блок мониторинга внешних климатических воздействий, включающий датчики контроля скорости и направления ветра, влажности, температуры окружающей среды и узлов конструкции искусственного сооружения, давления, интенсивности и количества осадков, блоки сбора и преобразования данных, блоки сравнения измеряемых датчиками сигналов с их критическими данными, блок обработки и анализа данных мониторинга искусственного сооружения, блок диагностики ...

СПОСОБ ОПРЕДЕЛЕНИЯ ИЗМЕНЯЮЩИХСЯ ВО ВРЕМЕНИ ТЕРМОМЕХАНИЧЕСКИХ НАПРЯЖЕНИЙ И/ИЛИ ГРАДИЕНТОВ НАПРЯЖЕНИЯ ПО ТОЛЩИНЕ СТЕНОК МЕТАЛЛИЧЕСКИХ ТЕЛ

МОБИЛЬНОЕ УСТРОЙСТВО ДЛЯ ОПРЕДЕЛЕНИЯ ПАРАМЕТРОВ СОСТОЯНИЯ И РАБОЧИХ ПАРАМЕТРОВ ВИБРАЦИОННЫХ МАШИН, ВИБРАЦИОННАЯ МАШИНА, ОСНАЩЕННАЯ ТАКИМ УСТРОЙСТВОМ, И СПОСОБ ОПРЕДЕЛЕНИЯ РАБОЧИХ ПАРАМЕТРОВ И ПАРАМЕТРОВ СОСТОЯНИЯ ВИБРАЦИОННЫХ МАШИН

Группа изобретений относится к измерительной технике и может быть использована при вибродиагностике оборудования. Устройство содержит блоки (26', 26", 26"') датчиков, данные измерений с которых можно посредством беспроводной связи передать на вычислительный блок (29). Каждый блок датчиков оснащен по меньшей мере тремя датчиками ускорения, задающими локальную систему координат, датчиком силы тяжести для детектирования ориентации/направления локальной системы координат в пространстве и интегральной схемой для обработки данных измерений, полученных блоками датчиков. Блоки датчиков можно прикреплять к вибрационной машине (1) с возможностью отсоединения и на расстоянии друг от друга в произвольной ориентации/направлении. Вибрационной машиной может являться вибрационный грохот, вибрационный конвейер, вибрационная сушилка или футеровочно-возбуждаемый грохот. Способ содержит следующие этапы: прикрепляют по меньшей мере четыре блока датчиков к вибрационной машине; измеряют ускорение вибрационной ...

СПОСОБ РЕКОНСТРУКЦИИ ТРЕХМЕРНОГО ОБРАЗА ФИЗИЧЕСКОГО СОСТОЯНИЯ ОБЪЕКТА МОНИТОРИНГА В ИЗМЕРИТЕЛЬНОЙ ТОЧКЕ

Способ реконструкции трехмерного образа физического состояния объекта мониторинга в измерительной точке, включающий измерение посредством, по крайней мере, одного синхронно измеряющего три ортогональные проекции вектора ускорения средства измерения пространственной вибрации, получение полного спектра амплитудно-частотной и фазовой информации о векторе деформационного состояния объекта мониторинга в измерительной точке, накопление массива векторных величин деформаций и отображение на мониторе компьютера визуального образа пространственных деформаций в измерительных точках, отличающийся тем, что перед отображением на мониторе визуального образа информацию о спектре векторов деформаций вводят в блок напряженно-деформированных соотношений, где через определяющие уравнения причинно-следственной связи параметров фундаментальных законов механики осуществляют синхронно с измерениями аналитический синтез 3D-суперпозиции спектра напряжений, обоснованный законами Гука и Пуассона для чувствительного ...

Strukturbauteil aus faserverstärktem Kunststoff für ein Fahrzeug und Verfahren zur Schadensdiagnose eines solchen Strukturbauteils

Die vorliegende Erfindung betrifft ein Strukturbauteil (100) aus faserverstärktem Kunststoff für ein Fahrzeug, wobei das Strukturbauteil (100) wenigstens einen Körperschallsensor (1) aufweist, mit welchem ein Körperschall des Strukturbauteils (100) aufnehmbar ist und welcher zur Ausgabe eines elektrischen Signals ausgebildet ist.

Vorrichtung, die zur Eigenfortbewegung längs einer Tragstruktur befähigt ist, sowie deren Verwendung

Vorrichtung (1), die zur Eigenfortbewegung längs einer Tragstruktur befähigt ist, mit wenigstens zwei Fügemodulen (3, 4), die jeweils zur Ausbildung einer lösbar festen Formschlussverbindung mit der Tragstruktur (2) aktorisch betätigbar sind, sowie wenigstens einem aktorisch in seiner Länge veränderlichen Vortriebsmodul (5), längs dem voneinander beabstandet die wenigstens zwei Fügemodule (3, 4) angebracht sind, dadurch gekennzeichnet, dass wenigstens ein Fügemodul (3, 4) mit einer Einheit zur Detektion mechanischer Schwingungen (22) in Wirkverbindung steht, die über das wenigstens eine Fügemodul (3, 4) Schwingungen der Tragstruktur (2) zu detektieren und in elektrische Schwingungssignale umzuwandeln vermag, und dass eine Auswerte- und Steuereinheit (23) vorgesehen ist, an die die Schwingungssignale übertragbar sind und die unter Zugrundelegung der Schwingungssignale Steuersignale generiert, die der aktorischen Betätigung der wenigstens zwei Fügemodule (3, 4) sowie des Vortriebsmoduls ( ...

Method and system for structural health monitoring of bonded joints

Method and apparatus for detection of structural damage

Apparatus for testing and supervising structures or parts thereof with the aid of mechanical oscillations

... 308,266. Schieferstein, G. H. March 20, 1928, [Convention date]. Testing physical qualities of materials. - Comprises a method of testing and supervising structures or parts thereof, in which the oscillation characteristics of individual members of, or of the whole structure, are taken from time to time and compared in order that defects or deterioration may be detected. A microphone casing a is mounted at the point of an oscillating member to be tested, the casing being provided with a diaphragm b in the middle of which is mounted a mass m provided on both sides with carbon plates c, c<1>. Microphone contacts d, d<1> are disposed opposite to the plates c, c<1>. Wires i, i<1> lead from the contacts to batteries e, e<1> which are connected by a resistance f over which works a contact k connected by a wire i' to the two carbon plates. If the contact k be set so that the two halves of the differential circuit are equally loaded any vibration of the microphone casing upsets the balance and ...

Pipework Fatigue Lifetime Measurement

Underwater structure monitoring systems and methods

Wind turbine monitoring

A test apparatus and a method of testing

Improvements in and relating to the testing of vehicle bodies

... 919,203. Testing vehicle strengths. BUDD CO. Nov. 8, 1961 [Nov. 14, 1960], No. 40066/61. Drawings to Specification. Class 79(3). A method of testing the strengths of motor vehicle bodies, especially those of unit construction, comprises securing one or more light, rigid frames to a stable rigid part of the vehicle body, dynamically loading the vehicle and measuring the deflection between each frame and a body part at a point distant from the point of securement of the frame. For measuring the distances, mechanical micrometer length measuring gauges, differential transformers or variable rheostats with multi-channel recorders may be used. The tests may be made whilst running the car along a road or in a laboratory.

A method for detecting degree of crack development of asphalt pavement

Damage indictor

Apparatus for testing the resistance of structural parts, particularly parts of aeroplanes

... 440,198. Testing structural parts of aeroplanes. BUGATTI, J., Molsheim, Bas-Rhin, France. June 19, 1934, Nos. 18124 and 18125. Convention dates, March 12 and April 25. [Class 4] In apparatus for testing the resistance to stresses of structural parts, more particularly the wings and other parts of aeroplanes, one or more of the surfaces of the wing are subjected to fluid pressure through the medium of inflatable bags, the wing being subjected to vibration by the aircraft or other engine and/or to rapid variation of the said fluid pressure. Each wing 16 may be gripped by two bags 8, 9, or by a single V-shaped bag connected to one or more sources of fluid pressure 10, which by valve control may set up vibrations of the pressure supply. The bags are supported by metal jaws 5 slidable on columns 4 arranged on a mass of concrete 1 having a central tank 2 for use when testing hydroplanes. The jaws 5 are held in a selected position by tensioning devices, suspension cables with or without counterweights ...

Improvements relating to apparatus for determining the rigidity of a structure

... 390,894. Testing physical qualities of materials. LE ROLLAND, P. M., 3, Rue St. Clement, Nantes, Loire-Inferieure, France. Dec. 30, 1931, No. 36024. Convention date, Dec. 31, 1930. [Class 106 (ii).] To determine the rigidity of a structure a rigid member having secured thereto two vibrating masses is connected to the structure so that the masses are free to vibrate, one mass is vibrated and the vibrations communicated through the structure to the other mass observed whereby the rigidity of the structure may be deduced. As applied to testing a metal pylon A, the member b connected to the top of the pylon carries two pendulums cl, c<2> of equal mass. One c<1> is set into oscillation and the character and extent of the oscillation imparted to the other c2 observed. In a second form the member is vertical and is connected to the middle of a horizontal beam supported at the ends. The member has connected to it by bowed leaf springs two masses. In a third form a depending rod has secured to the ...

METHOD AND APPARATUS FOR SIMULATING DYNAMIC STRESSES

DEVICE FOR CONTROLLING A MAST

PROCEDURE FOR THE SCHWINGUNGSANALYSE

VERFAHREN ZUM ÜBERPRÜFEN DER STANDSICHERHEIT EINES BETONFUNDAMENTES EINES FREILEITUNGSMASTES

VERFAHREN ZUM ÜBERPRÜFEN DER STANDSICHERHEIT EINES BETONFUNDAMENTES EINES FREILEITUNGSMASTES

DEVICE AND PROCEDURE FOR EXAMINING THE STABILITY OF A MAST

Apparatus for testing the pressure training of doors, windows and the like, of railroad cars

Die Erfindung betrifft eine Vorrichtung (1) zum Testen von Türen, Fenster, Abdeckungen, Portalen und dergleichen Bauteilen von Eisenbahnwaggons im Hinblick auf deren Druckertüchtigung. Sie weist zumindest eine hydraulische Zylinder-Kolben-Einheit (2) und zumindest zwei den zu testenden Gegenstand kontaktierenden oder an ihm haftenden Druckplatten (6) auf. Zur gleichmäßigen Druckaufbringung ist vorgesehen, dass zwischen der hydraulischen Zylinder-Kolben-Einheit (2) und den Druckplatten (6) zumindest ein Verteilerstab (3) oder eine Verteilerplatte (7) vorgesehen ist, die einerseits, gegebenenfalls indirekt, mit der hydraulischen Zylinder-Kolben-Einheit (2) verbunden ist, und andererseits, gegebenenfalls indirekt, mittels zumindest zweier Übertragungsstäbe (5) mit den Druckplatten (6) verbunden ist. Durch entsprechende Kaskadierung – Anordnen mehrerer derartiger Kraftteilungsvorrichtungen hintereinander - erreicht man eine besonders gleichmäße Druckaufbringung.

MONITORING AND DIAGNOSIS OF A TECHNICAL INSTALLATION USING PURELY MECHANICAL OF ACTIVATIONS INDICATION GIFT MEANS

SENSOR FOR AIR VEHICLES

Method for determining a structural state of a mechanically loaded unit

The present invention relates to a method for determining a structural state of at least one component of a mechanically loaded target unit, in particular a target unit of a rail vehicle, the method comprising, in an actual excitation step (109.4) of an evaluation cycle (109.3), 5 introducing a defined actual mechanical input signal into the target unit (105.1), in an actual capturing step (109.5) of the evaluation cycle (109.3), capturing an actual mechanical response signal of the target unit (105.1) to the mechanical input signal, and, in an actual evaluation step (109.6) of the evaluation cycle (109.3), comparing the actual mechanical response signal to a previously recorded baseline signal to establish an actual differential o feature and using the actual differential feature to determine the structural state. The baseline signal is representative of a previous mechanical response signal of the target unit (105.1) to a previous mechanical input signal, the previous mechanical input ...

NON-DESTRUCTIVE TESTING OF THE LINING OF A PROCESS VESSEL

A process for the non-destructive testing of a refractory lined process vessel comprising the steps of: (a) striking an external wall of a process vessel internally lined with a refractory material with an impulse hammer; (b) measuring selected frequency characteristics of the refractory lined process vessel; and (c) analysing the measured frequency characteristics and determining the integrity of the internal lining of refractory material from said measured frequency characteristics.

METHOD AND SYSTEM FOR MONITORING THE PERFORMANCE OF A PIPE CONTAINING A PRESSURISED FLUID

Procédé et système pour surveiller (monitoring) le comportement d'une tuyauterie contenant un fluide sous pression, cette tuyauterie comportant au moins une zone courante t des zones singulières. Ce procédé comprend : une surveillance (monitoring) statique d'un nombre prédéterminé de zones singulières, pour fournir des informations de dilatations circonférentielles, et un calcul, à partir desdites informations de dilatations circonférentielles, de la rigidité effective K(ti) de la tuyauterie et de sa section d'acier résiduelle mesurée As(ti). Ce procédé peut aussi comprendre une surveillance (monitoring) dynamique de la tuyauterie, pour fournir des informations de modes et de fréquences propres de vibration de cette tuyauterie.

METHOD AND APPARATUS FOR DETECTION OF STRUCTURAL DAMAGE

A method and apparatus for detecting and monitoring fractures in a structure by monitoring acoustic energy transmitted within the structure by receiving continuously over a period of time electrical signals from a plurality of acoustic transducers carried by the structure in a pulse processor and selecting pulses from the signals to form data bursts and deriving, for each of a plurality of the data bursts, delta-t values representing the differences between burst arrival times at each sensor, the delta-t values forming a delta- t pattern, and generating a damage indication signal when the delta-t pattern is repeated to a predetermined degree.

WIRELESS APPARATUS AND METHOD FOR ANALYSIS OF DRIVEN PILES

A system (100) for the determination of pile parameters includes at least one structure for measuring pile data. It includes a crane (10) on which is mounted a boom (11), which is mounted to swivel at its upper end by hammer leads 812), and at its lower end by a bottom brace (13). The structure for measuring pile data is disposed within a measurement range from a pile. A wireless transmitter is communicably connected to the structure for measuring pile data, the wireless transmitter for transmitting the pile data to at least one remotely located receiver. Pile data is preferably encloded in the transmitted data signal. The remotely located receiver is communicably connected to a device for determining at least one pile parameter from the pile measurement data. A method for driving piles includes the steps of wirelessly transmitting pile data to at least one remote receiver, determining at least one pile driving process parameter from the pile data, and driving the pile using the determined ...

SMART SKIN STRUCTURES

A smart skin structure (100) has vibration energy managing and steering capabilities. The skin can be used to managing vibrations in the skin or shell of a system, subcomponent, device, or structure. The skin has sensors coupled to the skin to obtain a response to vibrations. Actuators (102) integral with the skin can be selectively activated to apply forces to the skin to confine or redirect vibration energy to one or more predetermined skin regions. The forces applied by the actuators (102) can be controlled to create confinement power flows. Further, the skin actuators can be controlled using spatial derivatives of the vibration forces. The structure can be used in, but is not limited to, watercraft, aircraft, space vehicles, automobiles, marine devices, industrial machinery, machine tools, home appliances, buildings, bridges, and offshore oil platforms.

Method and system for determining static and/or dynamic, loads using inverse dynamic calibration

Methods and systems are described for the identification and determination of loads by inverse analysis. A new combination of instrumentation and measurements is provided which allows accurate identification/measurement of static and/or dynamic forces, or loads, working on arbitrary test-objects or systems (i.e. test objects), through measurements of the results of the loads on the test object, signals like pressures, electrical potential, magnet flux displacement, strain, etc. This procedure allows the measurement/identification of arbitrary single or multiple loads, in arbitrary combinations, and multiple directions. The procedure also allows the measurement/identification of loads with arbitrary evolution in time, including static and dynamic loads.

Multi-ferroic structural health monitoring systems and methods

A method for testing a multiple layer structure is described. The method includes monitoring strains experienced by strain sensitive, magnetic particles disbursed within an adhesive between a first layer and a second layer, and analyzing any changes in the strains experienced by the particles to determine an amount of damage or degradation to the structure.

Tunable Vibration Dampers and Methods of Manufacture and Tuning

Embodiments are directed to tunable damper embodiments and methods of using the same for damping resonant and non-resonant vibrations present within an object that the tunable damper is secured to. In some cases, the tunable damper may be tuned before, during or after being secured to an object.

Damage detection and remediation system and methods thereof

A damage detection and remediation system includes a sensing device for detecting damage events related to a structure of interest. Such damage events may include impact from a ballistic object, a tamper event, a physical impact, or other events that may affect structural integrity or cause failure. Illustratively, the sensing device is in communication with a measurement system to determine damage criteria, and a processing system which is configured to use the damage criteria to determine, for example, a direction of the initiation point of a ballistic causing the damage event.

Vehicle damage detection system and method of manufacturing the same

An impact detection and remediation system includes a sensing device for detecting damage events related to a structure of interest. Such damage events may include impact from a ballistic object, a tamper event, a physical impact, or other events that may affect structural integrity or cause failure. Illustratively, the sensing device is in communication with a measurement system to determine impact criteria, and a processing system which is configured to use the impact criteria to determine a direction of the initiation point of a ballistic causing the damage event.

Method for analyzing structure safety

The present invention discloses a method for analyzing structure safety, and the method uses valid vibration measurement signals to obtain mutual feedbacks for a structural model analysis and a calibrated structural model to simulate a disaster situation to obtain the critical force exertion and deformation scale of a structure. The method is applied to capture the stability index of the structure to analyze the structure safety or applied for a structure safety evaluation or a health monitoring, or even for a structure multi-hazards safety determination.

Method and system for monitoring a thin structure

A method and a system for monitoring a thin structure foresee acquiring the acceleration signals emitted by a plurality of accelerometers associated with the structure, obtaining the frequency spectrum of such signals, detecting their frequency peaks and temporal variations to calculate, for each of the frequency peaks, an average value and a statistical value that define a range of frequency values. Subsequently, at predetermined time periods, the frequency peaks are detected and, with respect to each average value, it is verified whether the corresponding peak frequency is outside of the respective range of frequency values and an error signal is generated as a function of such verification. In this case, the error signal and the processed signals of the accelerometers are sent to a remote unit where the signals are analysed to determine the state of the structure and its past data and to evaluate whether it is necessary for it to have technical personnel intervention.

System and method for obtaining and de-noising vibratory data

In one aspect, a method for de-noising vibratory data of a test component is disclosed. The method may generally include obtaining data related to a plurality of modeled mode shapes of a finite element model of a test component, obtaining data related to a plurality of experimental mode shapes of the test component from a plurality of non-contact vibration measurement devices and de-noising with a computing device the plurality of experimental mode shapes using the plurality of modeled mode shapes to create a plurality of de-noised mode shapes for the test component.

Wireless power transmission

A method, apparatus and software are disclosed for wireless power transmission in which the power transmission frequency is optimised.

Entropy-based impact load identification

Methods and apparatus for identifying the location of the load on a structure. Various embodiments include calculating a plurality of potential loading sites, assessing the statistical order of each of those predictions, and selecting regions of the structure where the load most likely occurred based on the orderliness (or randomness) of the assessments.

METHOD FOR DETECTING TEMPORALLY VARYING THERMOMECHANICAL STRESSES AND/OR STRESS GRADIENTS OVER THE WALL THICKNESS OF METAL BODIES

The present invention relates to a method for detecting temporally varying thermomechanical stresses and/or stress gradients over the wall thickness of metal bodies, in particular pipelines. In the method, the temperature on the outer surface of the body is measured in order to determine a temperature progression and stress progression therefrom. In addition, electromagnetic ultrasonic transducers are used at at least one measuring point on the outer surface in order to determine the progression of the stresses and/or stress gradients over time over the wall thickness of the body in conjunction with the result of the temperature measurement. The method allows the fatigue monitoring of pipelines even in the event of rapid stress changes. 1. A method for detecting temporally varying thermomechanical stresses and/or stress gradients over the wall thickness of metal bodies , in particular pipelines , in which a temperature is measured at at least one measurement point on an outer surface of the body and additional measurements are carried out using electromagnetic ultrasound transducers in the region of the measurement point to determine the stresses and/or stress gradients over the wall thickness of the body via the measured temperature from the additional measurements ,wherein a temperature curve between an inner surface and the outer surface is ascertained from the measured temperature and is used for the determination of the stresses and/or stress gradients over the wall thickness of the body from the additional measurements.2. The method as claimed in claim 1 ,characterized in that ultrasound runtime, amplitude, and/or eddy current impedance measurements are carried out using the electromagnetic ultrasound transducers, wherein the stresses and/or stress gradients are determined by analyzing the ultrasound runtime, amplitude, and/or eddy current impedance measurements in conjunction with the measured temperature or the ascertained temperature curve.3. The method as ...

Analyzing device, diagnosing device, analysis method, and computer-readable recording medium

Provided is an analysis device which enables highly accurate diagnosis of a structure state. An analysis device includes a system identification unit, an input modeling unit, an input generation unit, and a response calculation unit. The system identification unit identifies a model representing time evolution of a structure using a non-Gaussian random process, based on a distribution of response of the structure. The input modeling unit generates a probability model representing a distribution of an input, based on data indicating fluctuation of the input to the structure. The input generation unit generates an input signal for the structure based on the probability model. The response calculation unit random response of vibration occurring in the structure in response to the input signal, based on the model and the input signal.

CONNECTION END FITTING OF A FLEXIBLE LINE, MEASUREMENT DEVICE AND ASSOCIATED METHOD

An end fitting including an end part of the tubular sheath, an end section of each elongate element, an end vault, and a cover defining a chamber for receiving each end section. The end fitting includes at least one transducer for generating an ultrasonic wave guided in the elongate element, the generation transducer being placed on the elongate element in the receiving chamber, the generation transducer having a volume of less than 200 mm, in particular comprised between 20 mmand 50 mm. 1. A connection end fitting of a flexible line , the flexible line comprising at least one tubular sheath and at least one elongate element arranged around the tubular sheath , the end fitting comprising:an end part of the tubular sheath;an end section of each elongate element;an end vault and a cover defining a chamber for receiving each end section;{'sup': '3', 'at least one generation transducer configured for generating an ultrasonic wave guided in the elongate element, the at least one generation transducer being placed on the elongate element in the receiving chamber, the generation transducer having a volume of less than 200 mm.'}2. The end fitting according to claim 1 , wherein the generation transducer has a thickness claim 1 , considered relative to the sheath claim 1 , of less than 2 mm.3. The end fitting according to claim 1 , including a filler material filling the receiving chamber claim 1 , the filler material being in contact with the end section of the elongate element and covering the generation transducer.4. The end fitting according to claim 1 , wherein the flexible line comprises at least one armor ply claim 1 , the elongate element being an armor element of the armor ply.5. The end fitting according to claim 4 , wherein the flexible line comprises at least one inner armor ply and at least one outer armor ply claim 4 , the end fitting comprising at least one inner end section of at least one armor element of the inner armor ply claim 4 , and at least one outer ...

Reusable piezoelectric sensor for damage identification

A reusable piezoelectric sensor for damage identification includes a piezoelectric ceramic plate and a metal box bonded to the surface of a test piece, where a wire through hole is formed in the center of a top plate of the metal box, and a side wall of the metal box extends vertically upwards to form a striking face for being struck to remove the metal box from the test piece; the piezoelectric ceramic plate arranged in the metal box is closely and fixedly bonded to a bottom plate of the metal box; and wires of the piezoelectric ceramic plate penetrate through the wire through hole to be connected to an external impedance analyzer. The reusable piezoelectric sensor for damage identification is easy to manufacture and convenient to operate and can effectively eliminate the testing error caused by the difference of the piezoelectric ceramic plate.

STRUCTURE EVALUATION SYSTEM AND STRUCTURE EVALUATION METHOD

According to one embodiment, a structure evaluation system according to an embodiment includes a plurality of sensors, a position locator, and an evaluator. The plurality of sensors detect elastic waves. The position locator locates positions of elastic wave sources by using the elastic waves among the plurality of elastic waves respectively detected by the plurality of sensors having an amplitude exceeding a threshold value determined according to positions of the sources of the plurality of elastic waves and the positions of the plurality of disposed sensors. The evaluator evaluates a deteriorated state of the structure on the basis of results of the position locating of the elastic wave sources which is performed by the position locator. 1. A structure evaluation system comprising:a plurality of sensors which detect elastic waves;a position locator which locates positions of elastic wave sources on the basis of the plurality of elastic waves respectively detected by the plurality of sensors;a density distribution generator which generates an elastic wave source density distribution representing a distribution of densities of the elastic wave sources on the basis of results of the position locating of the elastic wave sources which is performed by the position locator;a corrector which corrects an elastic wave source density distribution serving as a comparison target which is obtained in advance by a sound structure by using a correction magnification for correcting the elastic wave source density distribution serving as a comparison target, in accordance with positions of the plurality of disposed sensors; andan evaluator which evaluates a deteriorated state of the structure on the basis of the elastic wave source density distribution generated by the density distribution generator and the elastic wave source density distribution serving as a comparison target which is corrected by the corrector.2. The structure evaluation system according to claim 1 , further ...

TUNABLE VIBRATION DAMPERS AND METHODS OF MANUFACTURE AND TUNING

Embodiments are directed to tunable damper embodiments and methods of using the same for damping resonant and non-resonant vibrations present within an object that the tunable damper is secured to. In some cases, the tunable damper may be tuned before, during or after being secured to an object. 1. A method of reducing vibration in an object , comprising:operatively coupling one or more vibration sensors to the object;measuring vibration in the object with the vibration sensor and outputting the measured vibration characteristics on a display; andadjusting a load mechanism of a tunable damper assembly which is coupled to the object by adjusting a biasing force to at least one flexible mass engaging member of the tunable damper assembly and so as to adjust a mechanical compliance of the flexible mass engaging member until a desired or acceptable measured vibration characteristic is displayed on the display.2. The method of claim 1 , wherein measuring vibration in the object comprises conducting a dynamic test including a dynamic compliance test of the object coupled to the tunable damper assembly.3. The method of claim 1 , wherein adjusting the load mechanism comprises turning a threaded member of the load mechanism so as to adjust the biasing force to the at least one flexible mass engaging member and adjust the mechanical compliance of the flexible mass engaging member.4. The method of wherein adjusting the load mechanism comprises adjusting the load mechanism so as to change an effective flexibility of the at least one flexible mass engaging member.5. The method of wherein the tunable damper assembly comprises one or more engaging member supports having a sloped surface which allows for a change in a contact area between the sloped surface and a highly damped element as a result of a change in the biasing force and adjusting the load mechanism to minimize the output of the sensor comprises changing the contact area between the sloped surface and the highly damped ...

NONDESTRUCTIVE INSPECTION TOOLS FOR TIMBER DISTRIBUTION POLES, AND RELATED METHODS

Electronic nondestructive inspection tools for timber distribution poles are provided herein. An electronic nondestructive inspection tool includes a vibration sensor configured to perform a vibration measurement of a timber distribution pole. In some embodiments, the electronic nondestructive inspection tool includes a processor configured to perform operations including estimating decay of the timber distribution pole, using the vibration measurement and a physics model of the timber distribution pole; and outputting an indication of the decay of the timber distribution pole. Related methods are also provided. 1. A first electronic device configured to perform vibration-based condition assessment of a timber distribution pole , the first electronic device comprising:a vibration sensor configured to perform a vibration measurement of the timber distribution pole;wireless communications circuitry configured to provide wireless communications with a second electronic device that is spaced apart from the timber distribution pole;a processor;a storage medium coupled to the processor and comprising computer readable program code that when executed by the processor causes the processor to perform operations comprising estimating decay of the timber distribution pole, using the vibration measurement and a physics model of the timber distribution pole; andan output interface configured to output an indication of the decay of the timber distribution pole to a user of the first electronic device.2. The first electronic device of claim 1 ,wherein the indication of the decay comprises an indication of whether it is safe for the user to climb the timber distribution pole, andwherein the output interface comprises an indicator light, a speaker, and/or a display screen of the first electronic device that is configured to output the indication of whether it is safe for the user to climb the timber distribution pole.3. The first electronic device of claim 1 , wherein the vibration ...

Integration of Digital Image Correlation with Acoustic Emission

An inventive approach is disclosed to integrate Digital Image Correlation (DIC) with the Acoustic Emission method that may be used for structural health monitoring and assessment of critical structural components in civil, mechanical, and aerospace industries. The inventive approach relies on passively recording acoustic emission across the specimen being tested and activating the DIC cameras automatically to measure deformation on the specimen's surface. The resulting acousto-optic system can be used to determine damage initiation, progressive damage development, identify critical regions and make lifetime predictions of the tested specimen. 1. A nondestructive method of determining the structural integrity of a specimen as a load is applied to the specimen , the method comprising the steps of:attaching at least one acoustic sensor to the specimen;applying a contrasting pattern on the surface of the specimen;calibrating a pair of stereoscopic cameras at the contrasting pattern;passively recording acoustic stress waves propagating in the specimen in an Acoustic Emission (AE) system electronically coupled to the at least one acoustic sensor;triggering operation of the cameras by the AE system;measuring deformation in the specimen based on load-induced movement of the contrasting pattern in a Digital Image Correlation (DIC) system, the DIC system being electronically coupled to the cameras; andcorrelating acoustic stress waves and strain data to determine the structural health of the specimen.2. The method according to claim 1 , further comprising claim 1 , after calibrating the cameras at the contrasting pattern claim 1 , applying a load to the specimen.3. The method according to claim 2 , wherein the load applying step comprises attaching the specimen to a load applying test stand.4. The method according to claim 3 , wherein the at least one acoustic sensor and the cameras are electrically connected to the test stand.5. The method according to claim 4 , wherein a ...

METHODS FOR PERFORMING TASKS IN A TANK CONTAINING HAZARDOUS SUBSTANCES

A method of performing a selected task in a tank containing an energetic substance uses an inherently safe mobile platform that includes a marker detector, a control unit, a power supply, a propulsion system, and an inherently safe enclosure. The inherently safe enclosure prevents a spark occurring inside the inherently safe enclosure from passing to an exterior of the inherently safe enclosure. All spark-generating components of the mobile platform are positioned inside the inherently safe enclosure. The method includes lowering the mobile platform into the tank, at least partially submerging the mobile platform in the energetic substance, and detecting a marker using the marker detector. No active physical carrier connects the mobile platform to an object exterior of the tank while the mobile platform is in the tank. 112-. (canceled)14. The method of claim 13 , further comprising: configuring the at least one inherently safe enclosure to not exhibit plastic deformation that forms a path allowing a spark occurring inside the at least one inherently safe enclosure from passing to an exterior of the at least one inherently safe enclosure after an interior of the at least one inherently safe enclosure is subjected to at least three and one-half bar for at least ten seconds.15. The method of claim 13 , further comprising: configuring the mobile platform to have at least two different degrees of freedom in the tank; and moving the mobile platform along the at least two different degrees of freedom using the propulsion system.16. The method of claim 13 , further comprising: configuring the mobile platform to weigh less than 10 claim 13 ,000 pounds.17. The method of claim 13 , further comprising: programming the at least one control unit to determine a heading for the mobile platform based on the at least one detected marker claim 13 , the heading being used to generate the at least one control signal.18. The method of claim 13 , further comprising:configuring the at ...

ARTICLE SORTING APPARATUS

An article sorting apparatus, comprising a sorting mechanism () that performs sorting operation to convey an inspected articles (W) in one of a plurality of sorting directions (D D and D); and a control unit that receives a sorting control signal (RJ) and controls operation of the sorting mechanism (), wherein the sorting mechanism () includes rejection arms () that change posture between a rejection posture that the rejection arms contact with the article (W) to change the conveyance direction to a specific sorting direction (D or D) and a pass allowance posture that the rejection arms allow the article (W) to pass without contacting with the article, and air cylinders (A, B) that operate the rejection arms to change the posture thereof, and an acceleration sensor () and a detection unit () and a deterioration determination circuit () that determine the deterioration of the movable portion (M). 1. An article sorting apparatus , comprising:a sorting mechanism that performs sorting operation so as to convey articles to be conveyed after a predetermined inspection in one of a plurality of sorting directions; anda control unit that receives a sorting control signal corresponding to a result of the inspection and controls operation of the sorting mechanism, whereinthe sorting mechanism includes a sorting member that changes posture between a first sorting posture that the sorting member contacts with the article being conveyed to change a conveyance direction of the article to a specific sorting direction and a second sorting posture that the sorting member allows the article to pass in the conveyance direction without contacting with the article, and an actuator that operates the sorting member to change the posture thereof,the article sorting apparatus is provided with a vibration detection unit that detects vibration of a movable portion from the actuator of the sorting mechanism to the sorting member, andthe control unit determines a deterioration state of the ...

SENSOR FOR A HIGH-PRESSURE LINE, AND METHOD FOR PRODUCING SAME

Sensor for high-pressure line and method for manufacturing thereof. The sensor detects parameters or properties of fluid conducted in a high-pressure line while maintaining the high pressure of the fluid. The sensor includes an inner tube extending concentrically in the outer tube that together form a tube and at least one groove which extends in the inner surface of the outer tube or in the outer surface of the inner tube in a longitudinal direction, at least one signal line arranged in the groove, and at least one pick-up element connected to the signal line and arranged at least in the groove or in at least one recess which is provided at least in the outer surface of the inner tube or in the inner surface of the outer tube in addition to the at least one groove. The outer tube is in frictional connection with the inner tube. 1. A sensor for a high-pressure line comprising:an outer tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, and an inner tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, wherein the inner tube extends concentrically in the outer tube such that the inner tube and the outer tube together form a tube, and wherein the overall wall thickness measured as half of the difference between the outer diameter of the outer tube and the inner diameter of the inner tube is equal to or larger than the inner diameter of the inner tube;at least one groove extending in a longitudinal direction of the tube in the inner surface of the outer tube or in the outer surface of the inner tube;at least one signal line placed in the groove; and,at least one pick-up element connected to the signal line,wherein the pick-up element is placed at least in the groove or in at least one recess provided in addition to the groove at least in the outer surface of the inner tube or in the inner surface of the outer tube, andwherein the outer tube is in a frictional connection with the inner ...

REMOTE TOWER MONITORING SYSTEM

A tower monitoring system for monitoring a remote tower for structural evaluation and analysis. The tower monitoring system includes a sensor unit that takes tower data readings that include displacement readings. The sensor unit provides the tower data readings to a ground control unit near the tower. A remote server is in communication with the ground control unit and includes a secondary source of data, such as historical data of the tower, current data or historic data from nearby towers, and nearby weather and geological data. The monitoring system implements a modal analysis to determine contributions to the displacement readings and alarms an operator if the modal readings indicate structural stress beyond a predetermined threshold. Data is saved and can be used in a trend analysis to review any changes in the tower displacement readings over a period of time. 1. A tower monitoring system , comprising:a sensor unit for attachment to a tower and having at least one displacement sensor to obtain displacement readings reference to the principle axes of the structure;a remote server in communication with the sensor unit for receiving and saving the displacement readings; anda processor configured to review the displacement readings and perform a modal analysis that separates mean displacement from the displacement readings due to at least one mode of oscillation of the tower.2. The tower monitoring system of claim 1 , wherein the processor converts the displacement readings into the at least one mode as a frequency representation.3. The tower monitoring system of claim 2 , wherein the at least one mode includes a first mode and a second mode claim 2 , the first mode including the natural frequency.4. The tower monitoring system of claim 2 , wherein the remote server includes predetermined threshold values and the processor is further configured to compare the at least one mode to the predetermined threshold values and generate an alarm if the predetermined ...

Method And Apparatus For Testing Nonlinear Parameter of Motor

A method and an apparatus for testing a nonlinear parameter of a motor are provided. The method includes exciting the motor to vibrate by an excitation signal; performing synchronous information acquisition on the vibrating motor to obtain a measured voltage value and a measured current value; acquiring an initial value of a linear parameter and an initial value of a nonlinear parameter of the motor; calculating a target value of the linear parameter of the motor according to the measured voltage value, the measured current value and the initial value of the linear parameter; performing adaptive filtering calculation according to the measured voltage value, the measured current value, the target value of the linear parameter and the initial value of the nonlinear parameter to obtain a target value of the nonlinear parameter of the motor. A terminal device and a computer-readable storage medium are also provided. 1. A method for testing a nonlinear parameter of a motor , comprising:exciting the motor to vibrate by an excitation signal;performing synchronous information acquisition on the vibrating motor to obtain a measured voltage value and a measured current value;acquiring an initial value of a linear parameter and an initial value of a nonlinear parameter of the motor;calculating a target value of the linear parameter of the motor according to the measured voltage value, the measured current value and the initial value of the linear parameter;performing adaptive filtering calculation according to the measured voltage value, the measured current value, the target value of the linear parameter and the initial value of the nonlinear parameter to obtain a target value of the nonlinear parameter of the motor.2. The method for testing a nonlinear parameter of a motor according to claim 1 , wherein the step of performing the adaptive filtering calculation comprises:acquiring a system initial value which affects the nonlinear parameter;calculating an update value of the ...

ABRADING TOOL FOR SENSING VIBRATION

A computing system may send and receive data from a variety of other devices, such as abrading tools and consumable abrasive products. The computing system may use this data for various purposes, such as tracking worker vibration dosage, monitoring inventory, promoting use of personal protective equipment, and other purposes. 1. An abrading tool comprising:a drive component configured to move a consumable abrasive product;one or more sensors, wherein the one or more sensors comprise a vibration sensor configured to measure a vibration level of the abrading tool;a communication unit configured to communicate with one or more external devices, wherein the communication unit is configured to send, to the one or more external devices, data based on one or more measurements from the one or more sensors; andone or more light emitting devices (LED) configured to indicate the vibration level of the abrading tool to a user.25-. (canceled)6. The abrading tool of claim 1 , wherein:the abrading tool further comprises a vibration sensor generating vibration measurements of the abrading tool, andthe abrading tool further comprises a microcontroller configured to perform an action in response to determining, based on the vibration measurements generated by the vibration sensor, that a user of the abrading tool has received a vibration dose greater than or equal to a threshold.7. The abrading tool of claim 6 , wherein:the communication unit is configured to receive an indication of a vibration dose already received by the user of the abrading tool, andthe microcontroller is configured to perform the action in response to determining, based on the vibration measurements generated by the vibration sensors and the indication of the vibration dose already received by the user, that the user has received the vibration dose greater than or equal to the threshold.8. The abrading tool of claim 6 , wherein performing the action comprises generating a warning.9. The abrading tool of claim 6 ...

An automatic method for tracking structural modal parameters

Structural health monitoring relating to an automatic method for tracking structural modal parameters. First, Natural Excitation Technique is used to transform the random responses into correlation functions and Eigensystem Realization Algorithm combined with the stabilization diagram is used to estimate modal parameters from various response segments. Then, modes from the latter response segment are classified as traceable modes or untraceable modes according to correlations between their observability vectors and subspaces of the existing reference modes. Final, traceable modes will be grouped into specified clusters with the same structural characteristics on the basis of maximum modal observability vector correlation and minimum frequency difference. Meanwhile, union of the untraceable modes and existing reference modes are updated as the new reference modes which can be applied into the next tracking process. This can track the modal parameters automatically without artificial thresholds and the specified reference modes.

A sensor placement method for capturing structural local deformation and global modal information

Sensor placement for structural health monitoring relating to modal estimation of bridge structures using structural data from strain gauges and accelerometers. Arrange strain gauges at large deformation positions of the structure for monitoring local deformation information. Adjust positions of strain gauges to include as much important displacement modal information as possible. Use strain mode shapes of strain gauge positions to estimate the displacement mode shapes of the structure and increase accelerometer to improve distinguishability of estimated displacement mode shapes, while reducing redundancy information among obtained displacement mode shapes. Different structural information contained in the strain gauges and the accelerometers are used, and placement of strain gauges can give local deformation information of key positions of the structure and obtain accurate structural displacement modal information. Placement of accelerometers improves displacement modal information obtained by estimation of strain mode shapes, and high-quality structural overall displacement modal information is obtained.

Structural Health Management Apparatus and System

A structural health management system may include a structural health management apparatus including a carbon nanotube element configured to generate an electrical output in response to a deformation of the carbon nanotube element, a piezoelectric element configured to actuate in response to an electrical voltage applied to the piezoelectric element, electrode elements coupled to the carbon nanotube element and the piezoelectric element, and a controller communicatively coupled to the structural health management apparatus, wherein the controller is configured to convert the electrical output into data representing a measurement value of a structural abnormality and to initiate application of the electrical voltage to the piezoelectric element to counter the structural abnormality upon the measurement value being equal to or greater than a predetermined threshold value.

HIGH SENSITIVITY ENVIRONMENTAL SENSOR NETWORK AND NETWORK SERVICES FOR STRUCTURAL HEALTH MONITORING

A high sensitivity structural health monitoring network includes a plurality of sensor nodes disposed apart from each other and communicating through one or more sensor channels. The nodes include smart sensor circuit boards with an interface to a wireless smart sensor board platform, a multi-axis accelerometer having a measurement range and resolution set to provide sensitivity to measure ambient structural vibrations an analog to digital converter for converting signals that includes a plurality of individual channels being individually programmable for signal conditioning for providing data to the interface. A network framework provides network services including a time synchronization service with network-wide global timestamps for sensor data and a unified sensing service that supports collection of data for all sensor channels from all nodes together with a single set of associated time stamps. 1 an interface to a wireless smart sensor board platform;', 'a multi-axis accelerometer having a sensitivity that can measure ambient structural vibrations resulting from non-catastrophic routine environmental factors;', 'an analog to digital converter (ADC) for converting signals from the multi-axis accelerometer, the ADC having a plurality of individual channels, each channel including being individually programmable for signal conditioning for providing data to said interface;, 'a plurality of sensor nodes disposed apart from each other and communicating through one or more sensor channels, each sensor node comprising a smart sensor circuit board, the sensor board comprisinga network framework providing network services for the plurality of sensor nodes through the one or more sensor channels, the network framework including a time synchronization service with network-wide global timestamps for sensor data and a unified sensing service that supports collection of data for all sensor channels from all nodes together with a single set of associated time stamps.. A high ...

METHODS AND SYSTEMS FOR STRUCTURAL HEALTH MONITORING

Methods and apparatus for structural health monitoring are described. In one example, a method for use in designing a structural health monitoring (SHM) system for use in monitoring a host structure is described. The method includes one or more of a process for designing SHM systems for any given piece of structural hardware, a process for evaluating a given SHM system, a method to quantify the performance of a given SHM system in comparison to current inspection processes, a finite element modeling approach to determining excitation frequencies to detect damage and for selecting the best time window to use for sensed excitation signals, a Bayesian Network based data fusion technique that fuses in environmental information (load cycles induced on the structure) with a damage index (DI) to produce crack detection and estimation of crack length, and a damage location and sensor selection technique. 1. A method for use in designing a structural health monitoring (SHM) system for use in monitoring a host structure , the SHM system including at least one actuator and at least one sensor , said method comprising:creating a first model of the SHM system using a finite element model (FEM);creating a second model of the SHM system using a FEM, wherein the first model includes structural damage and the second model does not include the structural damage;simulating signal propagation and response of the first model and the second model for a first frequency range comprising a plurality of excitation frequencies; anddetermining, based at least in part on said simulating, a second frequency range within the first frequency range in which the simulated response of the SHM system exhibits a relatively high correlation with the structural damage.2. A method in accordance with claim 1 , wherein said simulating signal propagation and response comprises claim 1 , for each excitation frequency of the plurality of excitation frequencies claim 1 , simulating signal propagation and ...

Vibration Test-Cell with Axial Load and In-Situ Microscopy

A new vibration test-cell that allows a static load to be applied simultaneously with lateral vibration coupled with in-situ microscopy that allows for the ability to open a fatigue crack up to a desired gap, as well as generate acoustic emission (AE) from vibration excitation, micro-fracture events are captured by the AE measurement while the physical observation of the crack faying surfaces is performed in-situ with an optical microscope embedded in the test cell.

SYSTEM FOR WIND TUNNEL OPERATION

A system for monitoring a model in a wind tunnel is provided. The system includes a plurality of sensors attached to a model in a wind tunnel. Each sensor of the plurality of sensors is configured to measure an attribute of the model. The system also includes a computing device in communication with the plurality of sensors. The computing device is programmed to receive a plurality of signals from the plurality of sensors, store a first threshold and a second threshold based on normalized alarm limits associated with at least one of the plurality of sensors, analyze the plurality of signals based, at least in part, on the first threshold and the second threshold, determine that a potentially negative condition is occurring based on the analysis, and alert a user to the potentially negative condition. 1. A system , comprising: receive signal data indicative of a plurality of signals from the plurality of sensors associated with a model of a wind tunnel, wherein the plurality of signals represent measurements of the attributes of the model;', 'store a first threshold based on normalized alarm limits associated with at least one of the plurality of sensors;', 'analyze the signal data based, at least in part, on the first threshold; and', 'in response to a determination that the first threshold has been exceeded, facilitate a transmission of one or more messages to instruct the wind tunnel to shut down without user interaction., 'a computing device configured to communicate with a plurality of sensors, wherein said computing device comprises a processor in communication with a memory, wherein said computing device is programmed to2. The system in accordance with claim 1 , wherein said computing device is further programmed to:determine that a second threshold has been exceeded; andin response to determining that the second threshold has been exceeded, initiate a short alarm, wherein the short alarm is at least one of an audible alarm or a visual alarm.3. The system in ...

METHOD OF DRILLING STRING ASSEMBLY FOR SECONDARY OPENING OF A PRODUCTIVE FORMATION

A method of a drilling string assembly for drilling small-diameter branched channels, including installation of operating elements arranged in a dynamically perturbed section of a loaded part of the drilling string. Moreover, a drilling string assembly, comprising oscillators arranged as coupled oscillators, a bit, a spindle section of a bottom-hole motor, power sections of a screw bottom-hole motor, assemblies of rigid and flexible pipes, as well as a device for regulating the axial load, are installed on a test bench. Bench tests are carried out according to modelled programs of possible emergency or non-emergency operating modes of the assembly, both as a whole and of the separate elements. 1. A method for drill string assembly as a technical dynamic system of connected oscillators for drilling branched channels of small diameter , including an assembly of operating components of various natural frequency positioned in a dynamically disturbed zone of the loaded part of the drill string ,whereina drill string assembly including oscillators positioned as coupled units, a drill bit, a bearing section of the mud motor, power sections of the mud motor, rigid and coiled tubing assemblies with viscoelastic mechanical properties and different natural frequencies, and an axial load control unit, is mounted on a test benchconducting tests following modeled programs of possible emergency and emergency-free operation modes for an assembly as a whole and its individual components,measuring amplitude, vibration speed and vibration acceleration for longitudinal, transverse and torsional vibration are measured for drilling each kind of bed rock, trends for cumulative wave motion are obtained for oscillators moving with collective group speed,analyzing said obtained values are analyzed to determine areas of dynamic stability at the test bench, displacement amplitude, determining vibration speed and vibration acceleration trends for longitudinal, transverse and torsional ...

SYSTEM AND METHOD FOR TESTING STRUCTURE MODE OF VIBRATION BASED ON DIGITAL IMAGE RECOGNITION

Disclosed is a system and method for testing a structure mode of vibration based on digital image recognition, which comprises a camera, targets, a bridge, a vertical acceleration sensor and a lateral acceleration sensor; the camera is arranged near the bridge head of the bridge; the bridge is equipped with a plurality of targets equidistantly inside guardrails on both sides; and the vertical acceleration sensor and the lateral acceleration sensor are fixedly arranged on the camera. The present application avoids the arrangement of a large number of sensors and complicated wiring in the bridge vibration detection, saves time and reduces economic cost, is convenient to operate, has relatively high precision, and has broad application prospects. 1123451332451. A system for testing a structure mode of vibration based on digital image recognition , comprising a camera () , targets () , a bridge () , a vertical acceleration sensor () and a lateral acceleration sensor (); the camera () is arranged near a bridge head of the bridge (); the bridge () is equipped with a plurality of targets () equidistantly inside guardrails on both sides; and the vertical acceleration sensor () and the lateral acceleration sensor () are fixedly arranged on the camera ().21883. The system for testing the structure mode of vibration based on digital image recognition according to claim 1 , the camera () is arranged on a camera tripod () claim 1 , and the camera tripod () is arranged near the bridge head of the bridge ().3233. The system for testing the structure mode of vibration based on digital image recognition according to claim 1 , the targets () on both sides of the bridge () are aligned correspondingly in the transverse direction of the bridge () claim 1 , and the target planes is perpendicular to the line of sight of the camera.467145676. The system for testing the structure mode of vibration based on digital image recognition according to claim 1 , also comprising a data acquisition ...

A sensor device for monitoring structural elements, a clamping element, an examination unit and a method for constructing said sensor device

Sensor device (1) for monitoring structural elements, comprising a container (4), which is preferably box-shaped and has a first elastic modulus (E1), a processing device (11), which is housed inside the container (4) and comprises a processing unit (11a), a support (12) on which the processing unit (11a) is installed, at least one inclinometer (3) and/or one accelerometer (15), which is/are housed on the support (12) and operatively connected to the processing unit (11a), the support (12) being secured to the container (4) by means of a fixing element (12a) having a second elastic modulus (E2) that is greater than or equal to the first elastic modulus (E1).

VIBRATION EXCITATION SYSTEM FOR AIRCRAFT AND AIRCRAFT

The present invention provides a vibration excitation system which allows a vibration exciter to be easily mounted on/removed from a wing. The present invention is a vibration excitation system for an aircraft which imparts vibration to a main wing of an aircraft subjected to a test flight, for evaluation of vibration resistance to flutter. A vibration exciter which generates vibration is removably mounted on the main wing through a fixing structure. It is preferable that the fixing structure transmit the vibration of the vibration exciter as a shearing force to a front spar and a rear spar of the main wing. 1. A vibration excitation system for an aircraft which imparts vibration to one or both of a main wing and a tail of an aircraft subjected to a test flight , for evaluation of vibration resistance to flutter , wherein a vibration exciter which generates the vibration is removably mounted on one or both of the main wing and the tail through a fixing structure.2. The vibration excitation system for an aircraft according to claim 1 , wherein the fixing structure transmits the vibration of the vibration exciter as a shearing force to a front spar and a rear spar of one or both of the main wing and the tail.3. The vibration excitation system for an aircraft according to claim 2 , wherein the fixing structure transmits the vibration of the vibration exciter to the front spar and the rear spar along a direction of the vibration of one or both of the main wing and the tail which matches a direction required for evaluation of the vibration resistance.4. The vibration excitation system for an aircraft according to claim 1 , wherein the fixing structure has a box structure.5. The vibration excitation system for an aircraft according to claim 1 , wherein the vibration exciter is mounted on the fixing structure through a fitting and is mounted/removed along with the fitting.6. The vibration excitation system for an aircraft according to claim 1 , wherein the vibration ...

STRETCHABLE SENSOR LAYER

A structural health monitoring system comprises: a flexible substrate configured for attachment to a structure, the flexible substrate having a plurality of sensors affixed thereon. The flexible substrate comprises a first portion configured for attachment to the structure, a second portion extending in continuous manner from the first portion, and a third portion extending in continuous manner from the second portion and being configured for attachment to the structure. The second portion includes a first section extending in continuous manner from the first portion, a second section connected between the first section and the third portion and having an edge extending in a direction different from an edge of the first section. 1. A structural health monitoring system , comprising:a flexible substrate configured for attachment to a structure, the flexible substrate having a plurality of sensors affixed thereon;wherein the flexible substrate comprises a first portion configured for attachment to the structure, a second portion extending in continuous manner from the first portion, and a third portion extending in continuous manner from the second portion and being configured for attachment to the structure; andwherein the second portion includes a first section extending in continuous manner from the first portion, a second section connected between the first section and the third portion and having an edge extending in a direction different from an edge of the first section.2. The structural health monitoring system of claim 1 , wherein the first and second portions are substantially linear portions.3. The structural health monitoring system of claim 2 , wherein the first and second portions are collectively arranged in a chevron shape in plan view.4. The structural health monitoring system of claim 1 , further comprising a plurality of the first portions claim 1 , a plurality of the second portions claim 1 , and a plurality of the third portions claim 1 , each ...

Measurement device and measurement method

A measurement device and a measurement method capable of measuring a depth of a damage source in a structure having a thickness of a predetermined value or more. According to an embodiment, a measurement device includes a first detector and a signal processing device. The first detector selectively detects surface waves that are excited when first elastic waves generated inside a structure formed of a solid material have reached a surface of the structure. The information processing device obtains information about a depth of a source of the first elastic waves within the structure on the basis of information of at least one of an amplitude and a time of arrival of the surface waves detected by the first detector.

Accelerograph and embedded protocol for structural health monitoring of civil engineering structurers regarding earthquake performance

Accelerometer measuring and recording instrument which automatically performs seismic assessment of building structures. The main scope of the instrument described is civil engineering buildings. It is manufactured using low cost sensor (1) and control unit (2) (low level microcontrollers). By combining proper sensor mounting time (1) and proper automated data processing, the dynamic characteristics of the structures (natural frequencies of vibration) can be accurately derived. The seismic assessment is then extracted by applying the guidelines of modem earthquake regulations defining the performance point for the targeted displacement of an input earthquake. In order to obtain the result, the elements used are the measured eigenfrequencies of the building, the standard Push Over curves for each building category that are parameterized in the instrument memory and the input data through which the category to which the building under measurement belongs is determined. These standard Push Over curves are automatically corrected to match the results of the measurements.

A METHOD FOR TRACKING STRUCTURAL MODAL PARAMETERS IN REAL TIME

Structural health monitoring relating to a real-time tracking method for structural modal parameters. The Natural Excitation Technique transforms structural random responses into free decaying responses used to calculate structural modal parameters by the Eigensystem Realization Algorithm combined with the stabilization diagram. Considering influence of environmental excitation level on the number of identified modes, the reference mode list is formed by union of modes obtained from response sets in a day. Then the modes can be tracked automatically according to rules of minimum frequency difference and maximum Modal Assurance Criterion (MAC). To avoid mode mismatch problem caused by absence of threshold, frequency differences and MACs between all modes from the latter response set and all reference modes are calculated and the mode will be tracked into the cluster corresponding to the specified reference mode only in the case that their frequency difference is smallest and the MAC is largest. 1step 1: extraction of modal parameters from different response sets{'sub': 1', '2', 'z, 'sup': 'T', '(1) select a response set h as y(t)=[y(t), y(t), . . . , y(t)], t=1, 2, . . . , N, where N is number of sampling points, z is number of sensors to measure responses; transform the response set h into correlation function matrices r(τ) with various time delays τ by Natural Excitation Technique. A method for tracking structural modal parameters in real time, wherein:{'sub': ms', 'ms, '(2) construct block Hankel matrices H(k−1) and H(k) with a correlation function matrix r(τ) as'}where r(τ) represents cross correlation function between response of measurement channel i and the response of measurement channel j;{'sub': ms', 'ms', 'u, '(3) set k=1, and then the Eigensystem Realization Algorithm is implemented on the matrices H(k−1) and H(k) to calculate the modal parameters (frequencies, damping ratios and mode shapes) from the model orders ranging from δ to nδ with the increment ...

Method for testing a rotor blade component of a rotor blade for a wind power installation, and rotor blade component

A method for testing a rotor blade component of a rotor blade for a wind power installation, comprising: dividing a rotor blade component of a rotor blade for a wind power installation into two, three or more rotor blade component segments, forming cutouts in a connection interface at a connection end of one of the rotor blade component segments. A rotor blade component segment of a rotor blade for a wind power installation, the rotor blade component segment comprising a connection end which has been formed by dividing a rotor blade component of a rotor blade for a wind power installation into two, three or more rotor blade component segments, a connection interface at the connection end of the rotor blade component segment, and cutouts which are formed in the connection interface and serve for connection of the rotor blade component segment to a test stand.

Support Structure Inspection Devices, Systems and Methods

Devices, systems, and methods for support structure inspection are provided. In one example implementation, a system can include one or more sensors configured to obtain data associated with a condition of a support structure, such as a utility pole. The system can include one or more processors. The system can include a communication circuit operable to communicate a data packet to a remote device. The data packet can include a payload generated based at least in part on the data associated with the condition of the utility pole. The system can include a power source operable to provide electrical power to the one or more sensors, one or more processors, and the communication circuit.

Methods of updating data in a virtual model of a structure

Method and apparatus for updating data descriptive of procedure within a structure to generate a user interface with a representation of the structure from a vantage point and according to a direction of interest. Data is generated by a sensor that records aspects of a procedure and a position of the condition is determined via wireless communications with multiple reference point transceivers. An augmented virtual model viewing interface is generated with positional coordinates and conditions related to the procedure.

Propeller health monitoring

A method for monitoring the health of propellers in an aircraft is provided. The method includes receiving pressure waves generated by at least one rotating propeller and analysing data corresponding to the received pressure waves to detect tonal noise which is within a selected frequency range. If tonal noise at harmonics of the propeller rotational frequency within the selected frequency range is detected within the selected frequency range, it is established that the health of at least one propeller may be impaired and an alert is created for inspection and maintenance to take place.

Optical sensor and method of use

An interferometer apparatus for an optical fibre system and method of use is described. The interferometer comprises an optical coupler and optical fibres which define first and second optical paths. Light propagating in the first and second optical paths is reflected back to the optical coupler to generate an interference signal. First, second and third interference signal components are directed towards respective first, second and third photodetectors. The third photodetector is connected to the coupler via a non-reciprocal optical device and is configured to measure the intensity of the third interference signal component directed back towards the input fibre. Methods of use in applications to monitoring acoustic perturbations and a calibration method are described.

SYSTEMS AND METHODS FOR EMBEDDED SENSORS WITH VARIANCE-BASED LOGIC

A variance-based substrate computing system is disclosed. The variance-based computing system includes a sensor configured to be embedded in a structure, the sensor further configured to generate an electrical output signal in response to a mechanical input, and a processor configured to receive the electrical output signal. The processor includes a measurement module configured to determine a variance of the electrical output signal about a base value, and a transformation module configured to generate a binary output signal based upon the variance. 1. A variance-based substrate computing system , the variance-based substrate computing system comprising:a sensor configured to be embedded in a structure, the sensor further configured to generate an electrical output signal in response to a mechanical input from the structure; and a measurement module configured to determine a variance of the electrical output signal about a base value; and', 'a transformation module configured to generate a binary output signal based upon the variance., 'a processor configured to receive the electrical output signal, the processor comprising2. The variance-based substrate computing system of claim 1 , the measurement module comprising a rectifier.3. The variance-based substrate computing system of claim 1 , the measurement module comprising a peak detector.4. The variance-based substrate computing system of claim 1 , wherein the transformation module is configured to generate a binary HIGH signal in response to the measurement module determining a variance that exceeds a first threshold value.5. The variance-based substrate computing system of claim 1 , wherein the transformation module is configured to generate a binary LOW signal in response to the measurement module determining a variance that is less than a first threshold value.6. The variance-based substrate computing system of claim 1 , wherein the sensor is configured to generate the electrical output signal in response to a ...

Optical measurement device, optical measurement method, and rotary machine

The present invention includes: a laser that can change the emission wavelength of light; a light-emitting fiber that emits light output from the laser onto a rotor; a concave surface that is provided in a recessed manner in the rotor and reflects the light emitted from the light-emitting fiber; a light-receiving fiber that receives the light reflected by the concave surface; a photodetector that detects the intensity of the light received by the light-receiving fiber; and a control device that controls the laser and performs optical measurement. The intensity is detected by the photodetector while changing the emission wavelength of the laser; the emission wavelength at which the intensity is largest is selected; and optical measurement is performed by detecting the intensity of light reflected by the concave surface by using light having an emission angle determined by the selected emission wavelength.

Structural vibration monitoring method based on computer vision and motion compensation

A structural vibration monitoring method based on computer vision and motion compensation provided in the present disclosure adopts a dual-camera system for self-motion compensation. The dual-camera system consists of a primary camera and a secondary camera rigidly connected to each other. The primary camera directly measures a structure displacement. This method inevitably includes an error generated due to motion of the primary camera. Meanwhile, the secondary camera measures displacements of translation and rotation, so as to estimate a measurement error caused by the motion of the primary camera. Then, with the displacement directly measured by the main camera minus the measurement error, a corrected structure displacement is obtained, thereby truthfully and accurately monitoring vibrations of a bridge structure.

DOUBLE FORCE TWO SENSOR VIBRATION METHOD

A testing apparatus, method and system for determining the ovaling mode in a cylindrical object, which may be excited through the synchronous application of two diametrically opposed identical vibrators to the outer perimeter. At least one vibration sensor transforms the vibrations to electrical voltage signals. Two vibration sensors placed at diametrically opposed locations, each halfway between the vibration inducers, may be used with a summer for adding the in phase response signals. The signal response is then converted into a digital signal and transformed into the frequency domain through a Fourier transform for determining the frequencies of the modes of interest. The resonant frequency of the ovaling mode of the element is identified and compared to that of a reference cylindrical object with comparable cross-sectional size to establish the stiffness and soundness degree of the cylindrical object. A structural integrity report including the strength and stiffness is generated. 1. A testing apparatus for determining the structural integrity of a cylindrical object , the cylindrical object having an outer surface , a height , H , and a diameter , D , comprising:{'b': '1', 'first and second vibration inducers, each attached to the outer surface of the cylindrical object at diametrically opposite positions at the same height H;'}a signal generator electrically connected to the first and second vibration inducers;{'b': '2', 'at least one vibration sensor attached at a position on the outer surface halfway between the vibration inducers and at a height H, the vibration sensor configured to output voltage signals representing sensed vibrations;'}a signal amplifier configured to amplify the voltage signals;an A/D converter configured to digitize the voltage signals; translate the digitized voltage signals to the frequency domain;', 'perform a frequency response analysis on the translated digitized voltage signals to determine the ovaling mode frequency and the ...

SELF-POWERED MULTI-FUNCTIONAL STRUCTURAL HEALTH MONITORING SENSOR

A structural health monitoring module including a sensor attached to a surface of a structural member configured to convert a strain on the structural member to electric energy, a gate operationally connected to the sensor and configured to control distribution of the energy, an energy storage device operationally connected to the gate and configured to receive the energy from the sensor, a data collection device configured to receive the energy from the sensor and at least one of process and record data related to the received energy, and a data transmission device configured to wirelessly transmit data from the data collection device to an external receiver. The gate is configured to direct a portion of the energy to the storage device in a storage state and configured to direct a portion of the energy to the data collection device when in load monitoring or interrogation states. 1. A structural health monitoring module comprising:a sensor configured to attach to a surface of a structural member, the sensor configured to convert a strain on the surface of the structural member to electric energy;a gate operationally connected to the sensor and configured to control distribution of the electric energy;an energy storage device operationally connected to the gate and configured to receive the electric energy from the sensor;a data collection device configured to receive the electric energy from the sensor and at least one of process and record data related to the received energy; anda data transmission device configured to wirelessly transmit data from the data collection device to an external receiver,wherein the gate is configured to direct a portion of the electric energy to the energy storage device in a storage state and configured to direct a portion of the electric energy to the data collection device when in a load monitoring state or an interrogation state.2. The module of claim 1 , wherein the data collection device and the data transmission device are ...

DEVICE FOR MEASURING MOMENTS OF A WIND TURBINE, METHOD FOR OPERATING A WIND TURBINE, AND WIND TURBINE

The invention relates to a device for measuring moments of a wind turbine, comprising a carrier pin that can be fixedly connected to a bedplate of a nacelle of the wind turbine, which is arranged on a tower and can be adjusted with respect to yaw, a torque support of a gearbox of the wind turbine being mountable on the carrier pin via an elastomer body, and to a method for operating a wind turbine and the corresponding wind turbine. The carrier pin is provided with one or more sensors that are designed and arranged to detect strains and/or shears of the carrier pin, a signal processing and/or evaluation unit being provided, which is connected to the sensor(s) and which can determine, during operation of the wind turbine, from measurement signals of the sensors, pitch moments and/or yaw moments that act upon the torque support. 1. A device for measuring moments of a wind turbine , comprising a carrier pin that is or can be connected to a bedplate of a nacelle of the wind turbine , which is arranged on a tower and which can be adjusted in respect of yaw , a torque support of a gearbox of the wind turbine being mountable or mounted on the carrier pin , wherein the carrier pin is provided with one or more sensors that are designed and arranged to detect strains and/or shears of the carrier pin , a signal processing and/or evaluation unit being provided , which is connected to the sensor or sensors and which is designed to determine , during operation of the wind turbine , from measurement signals of the sensors of deflections and/or shears of the carrier pin , pitch moments and/or yaw moments that act upon the torque support.2. The device according to claim 1 , wherein strain gauges are attached claim 1 , as sensors claim 1 , to the carrier pin.3. The device according to claim 2 , wherein for the purpose of measuring deflections of the carrier pin one or more strain gauges are aligned in the longitudinal direction of the carrier pin claim 2 , and/or for the purpose of ...

FATIGUE TESTING OF A WIND TURBINE BLADE

The application relates to an apparatus () for fatigue testing a wind turbine blade specimen (), and to a method using such an apparatus (). The apparatus () comprises first and second support assemblies () and an actuator () for cyclically deflecting the specimen () in a first transverse direction. The first and second support assemblies () comprise first and second holders () for holding first and second ends () of the specimen (), respectively, such that the longitudinal direction () of the specimen () extends between the first and second holders (). The first and second support assemblies () are arranged such that the first and second holders () are rotatable about a second transverse direction perpendicular to the first transverse direction and to the longitudinal direction () of the specimen (). The first support assembly () is further arranged such that the first holder () is moveable in the longitudinal direction relative to the second holder () when the specimen () is deflected by the actuator () in the first transverse direction. 1. An apparatus for fatigue testing a wind turbine blade specimen comprising:a first support assembly comprising a first holder for constraining a first end of the specimen;a second support assembly comprising a second holder for constraining a second end of the specimen such that a longitudinal direction of the specimen extends between the first and second holders; andan actuator adapted to cyclically deflect the specimen in a first transverse direction at a loading position between the first and second holders;wherein the first and second support assemblies constrain the specimen from movement in the first transverse direction and are arranged such that the first and second holders are rotatable about an axis extending in a second transverse direction perpendicular to the first transverse direction and to the longitudinal direction of the specimen, and wherein the first support assembly is further arranged such that the first ...

MEASUREMENT INSTRUMENT, MEASUREMENT METHOD, MEASUREMENT SYSTEM, AND PROGRAM

An acquisition unit acquires the width-direction acceleration and the vertical-direction acceleration of a surface of a structure on which a moving object moves from an acceleration sensor provided in the structure on which the moving object moves. A displacement computation unit computes the vertical-direction displacement of the structure on the basis of the vertical-direction acceleration. A correlation determination unit determines the correlation between the width-direction acceleration and the vertical-direction displacement. A movement detection unit detects the movement of the moving object on the structure on the basis of the correlation. 1. A measurement instrument comprising:an acquisition unit that acquires width-direction acceleration and vertical-direction acceleration of a surface of a structure on which a moving object moves from an acceleration sensor provided in the structure on which the moving object moves;a correlation determination unit that determines a correlation between the width-direction acceleration and the vertical-direction acceleration; anda movement detection unit that detects movement of the moving object on the structure on the basis of the correlation.2. A measurement instrument according to claim 1 , further comprising:a displacement computation unit that computes vertical-direction displacement of the structure on the basis of the vertical-direction acceleration.3. The measurement instrument according to claim 1 ,wherein the acceleration sensor is provided in an end portion of the structure which is parallel to a regulation direction of a moving direction regulation unit for the moving object which is provided in the structure and in a central portion of the end portion in the regulation direction.4. The measurement instrument according to claim 1 , further comprising:a filter unit that suppresses intrinsic resonance frequency components of the structure which are included in the width-direction acceleration and the vertical- ...

MEASUREMENT INSTRUMENT, MEASUREMENT METHOD, MEASUREMENT SYSTEM, AND PROGRAM

An acquisition unit acquires at least one of the vertical-direction acceleration and the width-direction acceleration of a surface of a structure on which a moving object moves from an acceleration sensor provided in the structure on which the moving object moves. An analysis unit analyzes the motion of the moving object moving on the structure on the basis of at least one of the vertical-direction acceleration and the width-direction acceleration. 1. A measurement instrument comprising:an acquisition unit that acquires width-direction acceleration of a surface of a structure on which a moving object moves from an acceleration sensor provided in the structure on which the moving object moves; andan analysis unit that analyzes motion of the moving object moving on the structure on the basis of the width-direction acceleration.2. The measurement instrument according to claim 1 ,wherein the acceleration sensor is provided in an end portion of the structure which is parallel to a regulation direction of a moving direction regulation unit for the moving object which is provided in the structure and in a central portion of the end portion in the regulation direction.3. The measurement instrument according to claim 1 ,wherein the acquisition unit has a displacement computation unit that acquires vertical-direction acceleration of the surface of the structure on which the moving object moves and computes vertical-direction displacement of the structure on the basis of the vertical-direction acceleration, andthe analysis unit computes a passing duration of the moving object moving on the structure on the basis of the vertical-direction displacement.4. The measurement instrument according to claim 3 ,wherein the analysis unit computes a passing duration of the moving object on the basis of the wave amplitude of the vertical-direction displacement generated due to movement of the moving object on the structure.5. The measurement instrument according to claim 4 ,wherein the ...

STRUCTURE MONITORING SYSTEM AND STRUCTURE MONITORING METHOD

A structure monitoring system includes a magnetic sensor that detects an intensity of a magnetic field from a structure including a metal portion using characteristics of an energy transition of alkali metal atoms, and a control unit that determines a degree of soundness (a degree of fatigue of the metal portion) of the structure using a result of the detection of the magnetic sensor. 1. A structure monitoring system , comprising:a magnetic sensor that detects an intensity of a magnetic field from a structure including a metal portion using characteristics of an energy transition of alkali metal atoms; anda determination unit that determines a degree of soundness of the structure using a result of the detection of the magnetic sensor.2. The structure monitoring system according to claim 1 , further comprising:a vibration sensor that detects vibration of the structure,wherein the determination unit determines the degree of soundness using a result of the detection of the vibration sensor, in addition to the result of the detection of the magnetic sensor.3. The structure monitoring system according to claim 2 , further comprising:a storage unit that stores vibration data regarding natural vibration of the structure,wherein the determination unit compares the detection result of the vibration sensor with the vibration data and determines the degree of soundness using a result of the comparison.4. The structure monitoring system according to claim 1 ,wherein the determination unit determines a degree of fatigue of the metal portion using the detection result of the magnetic sensor.5. The structure monitoring system according to claim 1 ,wherein the magnetic sensor includes:an atom cell filled with alkali metal;a light source unit that irradiates the atom cell with light; anda light detection unit that detects the light transmitted through the atom cell,wherein a body portion including the atom cell, the light source unit, and the light reception unit and formed as a ...

ACOUSTINC SENSING NODES AND RELATED SYSTEMS AND METHODS

In an example, a system includes a plurality of acoustically coupled nodes. Each of the nodes includes a transducer, a communication circuit and a controller. The transducer is adapted to be mechanically coupled to a medium. The communication circuit is coupled to the transducer to send and receive acoustic signals via the medium according to at least one communication parameter. The controller is to adaptively configure the at least one communication parameter of the communication circuit based on an acoustic signal received from at least one other of the nodes. 1. A system , comprising: a transducer adapted to be coupled to a medium;', 'a communication circuit coupled to the transducer to send and receive acoustic signals via the medium according to at least one communication parameter; and', 'a controller to adaptively configure the at least one communication parameter of the communication circuit based on an acoustic signal received from at least one other of the nodes., 'a plurality of acoustically coupled nodes, each of the nodes comprising2. The system of claim 1 , wherein the controller is further to configure the at least one communication parameter based on analyzing a frequency response determined for the acoustic signal received from the at least one other node.3. The system of claim 1 , wherein the network includes a subnetwork of nodes claim 1 , each of the nodes in the subnetwork having a communication link to at least some of the other nodes in the subnetwork claim 1 , the controller of each of the nodes in the subnetwork adaptively configuring at least one transmit parameter for each communication link to the other nodes in the subnetwork.4. The system of claim 1 , wherein at least one communication parameter is a transmit parameter that includes at least one of frequency claim 1 , data rate claim 1 , modulation protocol and transmit power level.5. The system of claim 1 , wherein one of the nodes is a control node that is adapted to be coupled ...

Methods of analysing apparatus

Engine health monitoring is used to assess the health of an engine, such as a gas turbine engine. Blades mounted on a shaft produce a modal response when excited. The shaft has an order related component that varies with the rotational velocity of the shaft. Modal responses are increased when the natural frequency range of the selected blade mode intersects with one of the order related components. By applying a short time chirp-Fourier transform with a frequency speed that is a function of a rate of change in the rotational velocity of the shaft a selected signal can be isolated. Cracks in the blades can be detected from the isolated signal.

Blade abnormality detecting device, blade abnormality detecting system, rotary machine system, and blade abnormality detecting method

A blade abnormality detecting device has a vibration acquisition unit that acquires vibration of a steam turbine when a rotation speed of a rotor changes, along with the rotation speed, a frequency analysis unit that performs frequency analysis according to an acquisition result of the vibration acquisition unit, and acquires natural frequency in each rotation speed of a rotor blade row, a contact rotation speed acquisition unit that acquires a contact rotation speed, which serves as a boundary between a state where shrouds of neighboring rotor blades are in contact with each other and a state where the shrouds are spaced apart from each other, according to an analysis result of the frequency analysis unit, and a determination unit that determines whether or not the rotor blade row is abnormal according to the contact rotation speed acquired by the contact rotation speed acquisition unit.

Structural impact detection and classification systems and methods

A method for classifying accelerometer data of a structure includes obtaining acceleration data from an accelerometer positioned to monitor a structure and receive vibrations from the structure. The acceleration data includes a plurality of measurements. The method includes selecting a subset of the plurality of measurements as an event signal. The subset of the plurality of measurements have a magnitude that exceeds a noise floor and includes a first measurement, a second measurement, and a plurality of intermediate measurements between the first measurement and the second measurement. The plurality of intermediate measurements exceed an event threshold. The event threshold is greater than the noise floor. The method includes comparing the event signal to a set of historical events and classifying the event signal as an event type.

Non-contact non-destructive inspection system, signal processing device, and non-contact non-destructive inspection method

A non-contact non-destructive inspection system according to an embodiment includes a sensor, a velocity detection unit, and a damage detection unit. The sensor detects a second elastic wave emitted to a medium surrounding an inspection object due to a first elastic wave propagating through the inspection object. The velocity detection unit detects a velocity of the first elastic wave based on a wavefront angle of the second elastic wave and a velocity of the second elastic wave. The damage detection unit detects damage to the inspection object based on the velocity of the first elastic wave.

Bond Interface Testing

A method and apparatus for testing a bond interface is provided. The method comprises directing laser energy at a first surface of a first material connected to a second material by an adhesive at a bond interface. The first surface is opposite the bond interface. A first acoustic impedance of the first material is greater than a second acoustic impedance of the second material. The method also determines whether an inconsistency is present in the bond interface after directing the laser energy.

MACHINE TOOL HEALTH MONITORING METHOD

A machine tool health monitoring method which is to use a predetermined plurality of vibration sensors on a plurality of components of a machine tool and to drive motors of the machine tool to excite the machine tool using an electronic device while the health status of the machine tool is good, and then to perform a diagnostic process to obtain a characteristic cluster consisting of a plurality of modals, and then to define the characteristic cluster as a sample health characteristic cluster. The diagnostic process includes the procedures of vibration transmissibility obtaining, singular value decomposition, curve fitting and modal establishing. In addition, excite the machine tool and proceed the diagnosis process to obtain a current health characteristic cluster. Finally, the current health characteristic cluster is compared with the sample health characteristic cluster to judge whether the machine tool is healthy or not. 2. The machine tool health monitoring method as claimed in claim 1 , wherein the step of judging the health status is to represent each of said modals in said current healthy characteristic cluster and said sample health characteristic cluster in a high-dimensional coordinate in a point claim 1 , and then to use the machine learning method of self-organizing map (SOM) to map the points in said high-dimensional coordinate system to a two-dimensional coordinate system to form a plurality of projection points on said two-dimensional coordinate system corresponding to said current health characteristic cluster that are defined as a current projection cluster claim 1 , and also to form a plurality of projection points on said two-dimensional coordinate system corresponding to said sample health characteristic cluster that are defined as a sample projection cluster; said safety threshold is represented by a safety threshold distance claim 1 , and said machine tool is judged to be healthy by obtaining whether the distance between the center point of ...

METHOD AND APPARATUS FOR ANALYSIS AND DETECTION OF ENCROACHMENT AND IMPACT UPON UNDERGROUND STRUCTURES

A structural health monitoring system comprises a first set of sensors operable for coupling to a structure positioned under ground, the first set of sensors further configured to detect an impact upon the structure while the first set of sensors is positioned under the ground; a second set of sensors operable to be positioned on or proximate to a surface of the ground, the second set of sensors further configured to detect an audible event occurring at a distance from the second set of sensors and the structure; and a computer readable memory storing one or more audio signatures that may correspond to the audible event. 1. A structural health monitoring system , comprising:a first set of sensors operable for coupling to a structure positioned under ground, the first set of sensors further configured to detect an impact upon the structure while the first set of sensors is positioned under the ground;a second set of sensors operable to be positioned on or proximate to a surface of the ground, the second set of sensors further configured to detect an audible event occurring at a distance from the second set of sensors and the structure; anda computer readable memory storing one or more audio signatures that may correspond to the audible event.2. The structural health monitoring system of claim 1 , wherein the first set of sensors comprises piezoelectric transducers.3. The structural health monitoring system of claim 1 , wherein the structure is a pipe or pipeline.4. The structural health monitoring system of claim 1 , further comprising:a controller in electronic communication with the first set of sensors and the second set of sensors; anda transmitter in electronic communication with the controller.5. The structural health monitoring system of claim 4 , wherein:the first set of sensors is configured to receive stress waves generated in the structure by the impact, to convert the received stress waves to corresponding electrical signals, and to transmit the ...

Real-time performance monitoring and predictive maintenance system

A system configured to monitor structural health of one or more pieces of equipment in real time. The system comprises a piece of equipment, a plurality of operating sensors coupled to the piece of equipment and configured to measure operational data regarding the piece of equipment, and an onboard processing transceiver in communication with the operating sensors. The onboard processing transceiver comprises a processor having a first processing device, a second processing device, and a third processing device configured to calculate structural health of the piece of equipment based on operational data.

Improvements in or relating to the monitoring of fluid pipes

A fluid pipe 1 is monitored using a distributed acoustic sensing (DAS) fibre 10 provided within pipe 1. The DAS fibre 10 is coupled at one end to a light emitter 101 and a light detector 102. The light emitter 101 emits light pulses into the DAS fibre. The light detector 102 detects backscattered light so as to provide an indication of the vibration experienced by each section of the DAS fibre 10 and thus of vibration characteristic of particular pipe events including leaks or the lie. The DAS fibre 10 in a pipe 1 can also be used to locate the route of a buried pipe 1 by successively tamping the ground surface at a number of locations A-E in the vicinity of the suspected route of the pipe 1 and comparing the tamping vibrations detected from each location A-E.

MEASURING SYSTEM WITH A PRESSURE DEVICE AS WELL AS METHOD FOR MONITORING AND/OR CHECKING SUCH A PRESSURE DEVICE

Method for monitoring and/or checking a pressure device having a lumen surrounded by a wall for conveying and/or storing a fluid. For such purpose, the method comprises a step of registering a strain, of the wall, by means of a strain gage, respectively a strain sensor formed therewith, affixed outwardly on the wall, for ascertaining a strain value representing the strain of the wall, as well as a step of using the strain value for ascertaining damage to the wall, as a result of plastic deformation of the wall and/or as a result of wear of the wall. A measuring system of the invention comprises supplementally to the pressure device at least one strain sensor affixed on a wall segment of the wall for producing a strain signal dependent on a time variable strain, of the wall segment as well as a transmitter electronics electrically coupled with the strain sensor. The transmitter electronics is adapted to receive the strain signal as well as with the application of the strain signal to ascertain damage to the wall. 151-. (canceled)52. A method for monitoring and/or checking a pressure device having a lumen surrounded by a wall , especially a metal wall , namely a device for conveying and/or storing a fluid , especially a gas , a liquid or a flowable dispersion , in the lumen , especially a fluid acting nominally with a static pressure of greater than 1 bar on the wall , which method comprises the steps as follows:registering a strain of the wall, especially a time variable strain of the wall and/or a strain of the wall dependent on a static internal pressure reigning within the lumen, for ascertaining a strain value representing strain of the wall; andusing the strain value for ascertaining damage to the wall, especially damage influencing pressure resistance of the pressure device and/or co-determining the remaining life of the pressure device and/or exceeding an earlier set, critical damage to the wall of the pressure device, especially as a result of plastic ...

STRUCTURAL HEALTH MONITORING SYSTEM AND METHOD

The present invention relates to nonlinear Vibro-Acoustic Modulation (VAM), one of the prevailing nonlinear methods for material characterization and structural damage evaluation. An algorithm of AM/FM separation is presented specifically for VAM method. While the commonly used Hilbert transform (HT) separation may not work for a typical VAM scenario, the developed IQHS and SPHS algorithms address HT shortcomings. They have been tested both numerically and experimentally (for fatigue cracks evolution) showing FM dominance at the initial micro-crack growth stages and transition to AM during macro-crack formation. In addition, the SPHS algorithm is capable of detecting fatigue crack via monitoring of modulation phase. 1. The methods described and illustrated in the accompanying specification and drawings. This application claims priority to U.S. Provisional Patent Application Ser. No. 62/941,501, filed Nov. 27, 2019, and U.S. Provisional Patent Application Ser. No. 63/116,701, filed Nov. 20, 2020, the entire disclosures of both of which applications are incorporated herein by reference.This invention relates to systems and processes for measuring and monitoring the structural health status of a building or other structure.Metal bonding challenges have a significant impact on achieving production goals and maintaining efficiency. The methods of assembly of parts into a mechanical structure presents a range of options for engineers to consider, all of which have tradeoffs between manufacturing and maintenance. Mechanical joining and welding are two widely used approaches in civil structures. The most common structural joining technique is mechanical joining in which parts are put together with rivets, bolts and screws. Welding is also a very flexible joining method that is common across many industries where parts are joined by fusion.Mechanical joining and welding are two widely used approaches in structures. Parts are put together with bolts, clamps, etc. in ...

Vibration visualization with real-time and interpolation features

A vibration testing system for structures visually displays vibration analysis information in the form of a graphic animation using a 3D model of the object. While only a subset of the surface points of the object model correspond to sensors on the structure, an interpolation feature of the system allows deformation information for all points of the model to be estimated. Interpolation weights can be calculated in advance to allow for real-time display of a test. Color can be used to enhance visualization of vibration amplitudes. The visualization can be performed offline after a vibration test has been completed to show modal analysis results or can be done in real-time using either blocks or RMS data obtained while the vibration testing is still on-going. This is especially useful for adjusting test parameters, such as the excitation location, amplitude or both, for more effective testing.

Measurement Method, Measurement Device, Measurement System, And Measurement Program

A measurement method includes: performing low-pass filter processing and high-pass filter processing on target data; estimating correction data; generating vibration component data, and the estimating the correction data includes: specifying a first interval, a second interval, and a third interval; generating first interval correction data, generating second interval correction data in the second interval by setting data in an interval before a first intersection point of first line data and second line data as the first line data, setting data in an interval from the first intersection point to a second intersection point of second line data and third line data as the second line data, and setting data in an interval after the second intersection point as the third line data; and generating third interval correction data.

Measurement Method, Measurement Device, Measurement System, And Measurement Program

A measurement method includes: a high-pass filter processing step of performing high-pass filter processing on target data including a drift noise to generate drift noise reduction data in which the drift noise is reduced, a correction data estimation step of estimating, based on the drift noise reduction data, correction data corresponding to a difference between the drift noise reduction data and data obtained by removing the drift noise from the target data, and a measurement data generation step of generating measurement data by adding the drift noise reduction data and the correction data. 1. A measurement method , comprising: a correction data estimation step of estimating, based on the drift noise reduction data, correction data corresponding to a difference between the drift noise reduction data and data obtained by removing the drift noise from the target data; and', 'a measurement data generation step of generating measurement data by adding the drift noise reduction data and the correction data., 'a high-pass filter processing step of performing high-pass filter processing on target data including a drift noise to generate drift noise reduction data in which the drift noise is reduced;'}2. The measurement method according to claim 1 , wherein the correction data estimation step includes:an interval specifying step of calculating a first peak and a second peak of the drift noise reduction data and specifying a first interval before the first peak, a second interval between the first peak and the second peak, and a third interval after the second peak,a first interval correction data generation step of generating first interval correction data by inverting a sign of the drift noise reduction data in the first interval,a second interval correction data generation step of generating second interval correction data by adding, at or before a predetermined time point of the second interval, data obtained by rearranging the drift noise reduction data before the ...

System for Hierarchical Actions Based Upon Monitored Building Conditions

Method and apparatus for measuring conditions within a structure to generate objective data indicative of an overall status of the structure. Aggregated objective measurements may quantify as built and experiential conditions of the structure over time. Utilizing objective measurements a determination is made of, among other things, compliance with applicable building codes. A remediation table is provided to assess the risk of noncompliance with the applicable building codes and to prescribe appropriate remedial actions. Alternatively a table of scaled alphanumeric ratings may be generated and associated with measured conditions within the structure. 1. A method of monitoring a stated condition of a structure , the method comprising the steps of:a) affixing wireless transceivers to reference positions within the structure;b) deploying multiple sensors to respective positions within the structure;c) generating a set of positional coordinates for each sensor based upon wireless communication to two or more of the wireless transceivers;d) generating a first table comprising conditions present in the structure precedent to deployment of the structure;e) with the sensors, measuring values of multiple conditions within the structure;f) recording a time registration indicating when values of the multiple conditions within the structure were measured;g) comparing the measured values of conditions within the structure with the conditions present in the structure precedent to deployment of the structure; andh) determining whether conditions precedent to deployment of the structure are present within the structure at a given point in time, based upon the measured values of multiple conditions within the structure measured by the sensors and the time registration.2. The method of wherein the position comprises X claim 1 , Y and Z coordinates.3. The method of claim 2 , wherein said positional coordinates designate a position relative to said positional coordinates.4. The method ...

Method and system for deciding damage degree category

A method for evaluating damage degree and a system for implementing the same are provided. A polygonal line including a first break point, a second break point, and a maximum response point is determined from a performance curve of each layer of a building. A maximum interlayer deformation angle of each layer is calculated from a maximum interlayer displacement of each layer and its corresponding interlayer height. A safety margin of each layer is calculated from the maximum interlayer layer deformation angle and a safety limit deformation angle, safety margins are compared, and one polygonal line having the smallest safety margin is selected. A safety limit point is calculated using the polygonal line selected Damage degree categories are defined using the first break point, the second break point, and the safety limit point. One damage degree category, to which the maximum response point corresponds, is decided out of the damage degree categories.

STRAIN AND VIBRATION MEASURING SYSTEM FOR MONITORING ROTOR BLADES

The invention relates to an assembly for monitoring and/or controlling a wind turbine. The assembly for monitoring and/or controlling a wind turbine comprises: an arrangement of two strain sensors, in particular three strain sensors, which detects blade bending moments of a rotor blade of a wind turbine in at least two different spatial directions; a first fibre optic vibration sensor for detecting vibrations of the rotor blade in a first spatial direction; and at least one second fibre optic vibration sensor for detecting vibrations of the rotor in a second spatial direction, which differs from the first spatial direction. 1. An assembly for at least one of monitoring and controlling a wind turbine , comprising:an arrangement of at least two strain sensors, which detects blade bending moments of a rotor blade of a wind turbine in at least two different spatial directions;a first fiber optic vibration sensor for detecting vibrations of the rotor blade in a first spatial direction; andat least one second fiber optic vibration sensor for detecting vibrations of the rotor blade in a second spatial direction, which differs from the first spatial direction.2. The assembly according to claim 1 , wherein the first spatial direction and the second spatial direction enclose an angle of 70° to 110°.3. The assembly according to claim 1 , wherein three strain sensors are provided claim 1 , and the three strain sensors are arranged in an azimuthal angular grid of about 120°.4. The assembly according to claim 1 , wherein the at least two strain sensors are fiber optic strain sensors.5. A rotor blade of a wind turbine claim 1 , comprising:an assembly for at least one of monitoring and controlling a wind turbine, comprising:an arrangement of at least two strain sensors, which detects blade bending moments of a rotor blade of a wind turbine in at least two different spatial directions;a first fiber optic vibration sensor for detecting vibrations of the rotor blade in a first spatial ...

DAMAGE DETECTION APPARATUS, DAMAGE DETECTION METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

A damage detection apparatus includes: an extraction unit configured to extract measured mode information representing a mode shape of a structure that is continuously supported at three or more support points, based on a plurality of pieces of vibration information measured by sensors that are disposed at a plurality of locations of the structure; a derivation unit configured to derive reference mode information representing a mode shape serving as a reference for damage evaluation of the structure, using a structure model in which a value representing strength of a coupling rotation spring is set to represent a boundary condition of an intermediate support point of the structure; and a detection unit configured to calculate an index indicating a degree of similarity between the measured mode information and the reference mode information, and detect damage to the structure based on the index indicating the degree of similarity. 1. A damage detection apparatus comprising:an extraction unit configured to extract measured mode information representing a mode shape of a structure that is continuously supported at three or more support points, based on a plurality of pieces of vibration information measured by sensors that are disposed at a plurality of locations of the structure;a derivation unit configured to derive reference mode information representing a mode shape serving as a reference for damage evaluation of the structure, using a structure model in which a value representing strength of a coupling rotation spring is set to represent a boundary condition of an intermediate support point of the structure; anda detection unit configured to calculate an index indicating a degree of similarity between the measured mode information and the reference mode information, and detect damage to the structure based on the index indicating the degree of similarity.2. The damage detection apparatus according to claim 1 ,wherein the structure model is represented using: ...

Measurement Method, Measurement Device, Measurement System, And Measurement Program

A measurement method includes: a high-pass filter processing step of performing high-pass filter processing on observation data-based velocity data including a drift noise to generate drift noise reduction data in which the drift noise is reduced; a displacement data generation step of generating displacement data by integrating the drift noise reduction data; a correction data estimation step of estimating, based on the displacement data, correction data corresponding to a difference between the displacement data and data obtained by removing the drift noise from data obtained by integrating the velocity data; and a measurement data generation step of generating measurement data by adding the displacement data and the correction data.

Method and System for Accelerated Fatigue Damage Testing of an Object

A method and system for accelerated fatigue damage testing of an object excited via an actor, wherein a drive signal is generated and transmitted to the actor, where the acceleration of the object or a mounting base of the actor is measured and supplied to a control system, where a Power Spectral Density (PSD) and a Fatigue Damage Spectrum FDS within the control system are calculated from the measured acceleration, whereby the calculated PSD is compared with a target PSD, whereby the calculated Fatigue Damage Spectrum FDS is compared with a target FDS, whereby a new drive frequency spectrum is calculated based on the comparisons and, one or multiple time domain blocks for the drive signal for a next cycle are generated from the new drive frequency spectrum and transmitted to the actor such that accelerated vibration testing without affecting the failure mode is achieved which provides more realistic results.

Estimating method, information processing device, and non-transitory computer-readable recording medium storing estimating program

An estimating method, includes: generating, by a computer, a plurality of frequency spectra based on data measured during movement on a structure at a plurality of speeds; identifying a range of a natural frequency of the structure based on the plurality of frequency spectra; and calculating the natural frequency based on one or more dominant frequencies included in the range among dominant frequencies of the plurality of frequency spectra and speeds when the one or more dominant frequencies included in the range are measured.

ESTIMATING DEVICE, ESTIMATING METHOD, AND PROGRAM STORING MEDIUM

In order to provide an estimating device and the like capable of easily estimating the strength of a pipe, this estimating device is provided with a frequency response calculating unit, a pipe rigidity variable estimating unit, and a strength estimating unit. The frequency response calculating unit calculates a frequency response function of the pipe on the basis of excitation force data representing an excitation force when the pipe is excited, and response data obtained by measuring vibrations propagating through the pipe. The pipe rigidity variable estimating unit estimates a parameter relating to the rigidity of the pipe on the basis of a frequency response function model, which is a model representing the frequency response of the pipe, and the frequency response function. The strength estimating unit estimates the strength of the pipe on the basis of a relationship between the parameter and the strength of the pipe. 1. An estimating device comprising:at least one processor configured to:calculate, based on an excitation force when a pipe is excited and a vibration response propagating through the pipe, a frequency response function of the pipe;estimate, based on a frequency response function model being a model representing a frequency response of the pipe, and the frequency response function, a parameter relating to rigidity of the pipe; andestimate, based on a relation between the parameter and strength of the pipe, the strength of the pipe.2. The estimating device according to claim 1 , whereinthe at least one processor estimates the parameter by approximating the frequency response function model to the frequency response function.3. The estimating device according to claim 2 , whereinthe at least one processor estimates the parameter in such a way that a difference between the frequency response function model and the frequency response function is within a predetermined range.4. The estimating device according to claim 1 , whereinthe parameter is at ...

SYSTEM AND METHOD FOR INSPECTING THE CONDITION OF STRUCTURES USING REMOTELY CONTROLLED DEVICES

Disclosed is a system for inspecting a structure without physically contacting the structure. The system includes a remotely controlled device that includes a sonar/ultrasound transceiver, a camera and a mapping module for generating geotags corresponding to the structure. The remotely controlled device optionally includes an infrared camera and a lidar. As the remotely controlled device moves along or around the perimeter of the structure, the system collects acoustic, lidar, infrared and photogrammetry data to create a virtual model of the structure. Geotagged acoustic, infrared and lidar data identifying faults in the structure is overlaid on the virtual model of the structure. 1. A remotely controlled device for inspecting a structure without physically contacting the structure comprising:a sonar/ultrasound transceiver for transmitting acoustic/ultrasound signals in the direction of a plurality of surfaces of the structure as the remotely controlled device moves along or around a perimeter of the structure without the sonar/ultrasound transceiver contacting the structure and for receiving acoustic/ultrasound signals backscattered from said plurality of surfaces of the structure without the sonar/ultrasound transceiver contacting the structurea mapping module for generating geotags identifying coordinate data corresponding to said surfaces of the structure in synchronization with said transmitting of said acoustic/ultrasound signals; anda processor for receiving said backscattered acoustic/ultrasound signals, and said geotags, assembling data packets containing said backscattered acoustic/ultrasound signals and said geotags, and inserting a time stamp for each of said packets,wherein the processor processes said backscattered sonar/ultrasound signals to detect the locations and presence of voids or distortions in the structure and said mapping module generates geotags for said voids or distortions and corresponding data points.2. The remotely controlled device of ...

GLAZING SENSOR

A glazing sensor for detecting vibration of an automotive glazing. The glazing sensor includes at least one vibration sensor and a communication module. The vibration sensor converts a vibration of the glass into an electrical signal and the communication module transmits a signal of characteristic information of the electrical signal. The glazing sensor further includes an acceleration sensor. The glazing sensor puts itself in sleep mode when no acceleration is detected during a predetermined period of time, and puts itself in active mode when an acceleration is detected, with the functionality of the glazing sensor in sleep mode is reduced compared to the functionality in active mode. 1: A glazing sensor for detecting vibration of an automotive glazing , the glazing sensor comprising at least one vibration sensor , and a communication module ,wherein the vibration sensor is configured to convert a vibration of the automotive glazing into an electrical signal, andwherein the communication module is configured to transmit a signal comprising characteristic information of the electrical signal, the glazing sensor further comprises an acceleration sensor, the glazing sensor is configured to put itself in sleep mode when no acceleration is detected during a predetermined period of time, and put itself in active mode when an acceleration is detected,wherein the functionality of the glazing sensor is reduced in sleep mode compared to the functionality in active mode.2: The glazing sensor according to claim 1 , wherein the glazing sensor is configured to read out the acceleration sensor at regular intervals and put the glazing sensor in sleep mode if no acceleration is detected during a predetermined number of intervals.3: The glazing sensor according to claim 1 , wherein the glazing sensor is configured to receive an interrupt from the acceleration sensor for detecting an acceleration.4: The glazing sensor according to claim 1 , wherein the glazing sensor is configured ...

SYSTEMS AND METHODS FOR STRUCTURAL HEALTH MONITORING AND PROTECTION

Structural health monitoring and protection systems and methods are provided. System and methods utilize structural information and/or enhanced built in testing capabilities for detecting failure modes that may cause damage to a structure. Systems and methods herein may protect a structure by mitigating one or more incorrect forces. The structure may be an aircraft, a rotary wing aircraft, or any other physical structure subject to vibrations and receptive to canceling of those vibrations. 1. A structural health monitoring and protection system , the system comprising: at least one force generator (FG);', 'at least one sensor configured to generate a signal upon detecting a structural vibration;', 'a controller in electronic communication with each of the at least one FG and the at least one sensor, wherein the controller is configured to receive the signal, generate at least one force command, and electronically communicate the at least one force command to the at least one FG, the electronic communication providing for cancelling the structural vibration;, 'an Active Vibration Control (AVC) system, comprisinga Structural Health Monitoring (SHM) system comprising at least one structural health sensor configured to measure a structural load, a strain, or a vibration; anda communication interface disposed between the AVC system and the SHM system for facilitating electronic communications therebetween.2. The system of claim 1 , wherein the controller is configured to correlate the structural vibration with the structural load claim 1 , strain claim 1 , or the vibration thereby mitigating an incorrect force applied to a structure.3. The system of claim 1 , wherein the at least one FG is a a circular force generator (CFG) or a linear FG.4. The system of claim 1 , wherein the at least one sensor for measuring structural vibration comprises at least one accelerometer.5. The system of claim 1 , wherein the at least one structural health sensor comprises at least one ...

Information output device, and information output method

This information output device is provided with: a detecting unit for detecting a rotational speed of an engine mounted in a vehicle; a storage unit for storing historical information indicating the history of a state in which the rotational speed was less than the rotational speed of the engine when idling; a storage control unit for causing the storage unit to store the historical information; and an output unit for outputting the historical information being stored by the storage unit.

A METHOD OF MODE ORDER DETERMINATION FOR ENGINEERING STRUCTURAL MODAL IDENTIFICATION

The presented invention belongs to the technical field of data analysis for structural health monitoring, and relates to a method of the mode order determination for the modal identification of engineering structures. The presented invention first calculates the structural natural frequencies for every order by eigensystem realization algorithm. Then the modal responses for every natural frequency are extracted. After obtaining the square mean root of modal responses, the modal response contribution index (MRCI) is calculated by summation of square mean root for every degree-of-freedom. The relation map between mode order and MRCI is drawn. The mode order is determined by the obvious gap between two adjacent MRCI according to the relation map. This order is also the truncated order of singular matrix in the eigensystem realization algorithm, which is useful to identify other modal parameters accurately. 1Step 1: Sample and process the impulse response;{'sub': k', 'k, 'The structural impulse responses yare collected; The Hankel matrix and H(k−1) and H(k) are built by y. The procedures of the mode order determination method for the modal identification of engineering structures are as follows:{'br': None, 'i': H', 'k−', 'UΓ', 'V, 'sup': 2', 'T, '(1)='}where k+i represents the k+i time point; the number from k to k+rH+cH−2 is the number of time points for the time history; H(k−1) can be obtained by replacing k with k−1; H(k−1) is then decomposed by singular matrix decomposition as follows:Step 2: obtain the modal shape matrix{'sub': j', 'j, 'The rank cH of singular matrix is assumed to be the structural mode order; Then the eigenvalue λcan be obtained by eigensystem realization algorithm; The relation equation between modal responses and structural responses is built using N eigenvalues, and the modal shape matrix Φis obtained as followswhere Γ is singular value matrix; U and V are unitary matrix;{'sup': th', 'th, 'Step 3: Obtain the modal response for the jmode and ...

Systems And Methods For Determining A Natural Frequency Of A Structure

In one embodiment, a system and method for determining a natural frequency of a structure involve modeling the structure, creating a synthesized excitation comprising a plurality of waves having various frequencies within a defined range of frequencies, applying the synthesized excitation to a base of the modeled structure, and generating response data indicative of a natural frequency of the modeled structure that is based upon the application of the synthesized excitation. 1. A method for determining a natural frequency of a structure , the method comprising:modeling the structure;creating a synthesized excitation comprising a plurality of waves having various frequencies within a defined range of frequencies;applying the synthesized excitation to a base of the modeled structure; andgenerating response data indicative of a natural frequency of the modeled structure that is based upon the application of the synthesized excitation.2. The method of claim 1 , wherein the structure comprises an earthen structure.3. The method of claim 1 , wherein modeling the structure comprises computer modeling the structure.4. The method of claim 1 , wherein computer modeling the structure further comprises selecting and inputting a plurality of parameters that define the nature of the structure.5. The method of claim 4 , wherein the plurality of parameters include each of a zone parameter claim 4 , a material property claim 4 , a boundary parameter claim 4 , and a geometry parameter.6. The method of claim 1 , wherein creating a synthesized excitation comprises creating a synthesized sum of sines excitation that comprises all possible sinusoidal waves within the defined range of frequencies.8. The method of claim 7 , wherein creating a synthesized excitation further comprises selecting parameter for each of PHA claim 7 , F claim 7 , f claim 7 , t claim 7 , and T.9. The method of claim 1 , further comprising applying multiple synthesized excitations having different PHA values to the ...

A METHOD AND SYSTEM FOR MEASURING DEFORMATION OF A SURFACE

Deformation of a surface, such as a pavement surface is measured using a rolling weight or wheel carrying one or more accelerometers positioned to measure the deformation occurring at a point on or near the perimeter of the wheel. The weight is rolled over the surface to be measured. The signals developed by the one or more accelerometers during a stationary cycloidal period of the point on the perimeter of the wheel are analysed to provide a measure of surface deformation based on the one or more signals. 1. A method of measuring deformation of a surface comprising:a. providing an accelerometer positioned to measure deformation at or near the periphery of a rolling weight;b. rolling the rolling weight over the surface;c. analysing one or more signals developed by the accelerometer during a stationary cycloidal period of the accelerometer; andd. developing a measure of surface deformation based on the one or more signals.2. A method of measuring deformation of a surface comprising:a. providing an accelerometer positioned to measure deformation proximate to the surface;b. applying a downward force to the surface whilst the accelerometer is maintained with its position being in substantially fixed relationship to the surface;c. analysing one or more signals developed by the accelerometer; andd. developing a measure of surface deformation based on the one or more signals.37.-. (canceled)8. A method of measuring deformation of a surface comprising:a. providing an IMU positioned to measure deformation at or near the periphery of a rolling weight;b. rolling the rolling weight over the surface;c. analysing one or more signals developed by the IMU at or near a stationary cycloidal period of the accelerometer; andd. developing a measure of surface deformation based on the one or more signals.9. A method as claimed in wherein the IMU includes one or more accelerometer and one or more gyroscope.10. A method as claimed in wherein the IMU includes three accelerometers with their ...

Optical sensor and method of use

An interferometer apparatus for an optical fibre system and method of use is described. The interferometer comprises an optical coupler and optical fibres which define first and second optical paths. Light propagating in the first and second optical paths is reflected back to the optical coupler to generate an interference signal. First, second and third interference signal components are directed towards respective first, second and third photodetectors. The third photodetector is connected to the coupler via a non-reciprocal optical device and is configured to measure the intensity of the third interference signal component directed back towards the input fibre. Methods of use in applications to monitoring acoustic perturbations and a calibration method are described.

HIGH SENSITIVITY ENVIRONMENTAL SENSOR NETWORK AND NETWORK SERVICES FOR STRUCTURAL HEALTH MONITORING

A high sensitivity structural health monitoring network includes a plurality of sensor nodes disposed apart from each other and communicating through one or more sensor channels. The nodes include smart sensor circuit boards with an interface to a wireless smart sensor board platform, a multi-axis accelerometer having a measurement range and resolution set to provide sensitivity to measure ambient structural vibrations an analog to digital converter for converting signals that includes a plurality of individual channels being individually programmable for signal conditioning for providing data to the interface. A network framework provides network services including a time synchronization service with network-wide global timestamps for sensor data and a unified sensing service that supports collection of data for all sensor channels from all nodes together with a single set of associated time stamps. 1. A high sensitivity structural health monitoring network , the network comprising: an interface to a wireless smart sensor board platform;', 'a multi-axis accelerometer having a sensitivity that can measure ambient structural vibrations resulting from non-catastrophic routine environmental factors;', 'an analog to digital converter (ADC) for converting signals from the multi-axis accelerometer, the ADC having a plurality of individual channels, each channel including being individually programmable for signal conditioning for providing data to said interface;, 'a plurality of sensor nodes disposed apart from each other and communicating through one or more sensor channels, each sensor node comprising a smart sensor circuit board, the sensor board comprisinga network framework providing network services for the plurality of sensor nodes through the one or more sensor channels, the network framework including a time synchronization service with network-wide global synchronization for sensor data and a unified sensing service that supports collection of data for all ...

PHYSICAL QUANTITY DETECTION APPARATUS, MEASUREMENT SYSTEM, AND MEASUREMENT APPARATUS

A detecting element unit of a physical quantity detection apparatus includes a detection part and a supporting part. The detection part has a base part, a movable part coupled to the base part via a joint part, and a vibrator provided over the base part and the movable part, and the supporting part includes a fixing portion to be fixed to a base for supporting the base part. A processing unit of the physical quantity detection apparatus extracts vibration response signals at a resonance frequency of the detecting element unit from output of the vibrator. 1. A physical quantity detection apparatus comprising:a detecting element unit havinga detection part having a base part, a movable part coupled to the base part via a joint part, and a vibrator provided over the base part and the movable part, anda supporting part including a fixing portion to be fixed to a base for supporting the base part; anda processing unit that extracts vibration response signals at a resonance frequency of the detecting element unit from output of the vibrator.2. The physical quantity detection apparatus according to claim 1 , wherein the processing unit outputs amplitude information of the vibration response signals.3. The physical quantity detection apparatus according to claim 2 , wherein the processing unit calculates physical quantity signals from output of the vibrator.4. The physical quantity detection apparatus according to claim 3 , wherein the processing unit outputs one of the amplitude information and the physical quantity signals according to a command.5. The physical quantity detection apparatus according to claim 3 , wherein claim 3 , in the physical quantity signals claim 3 , resonance frequency components of the detecting element unit are suppressed or removed.6. The physical quantity detection apparatus according to claim 2 , wherein the amplitude information is envelope signals.7. A measurement system comprising:a physical quantity detection apparatus having a detecting ...

Exciter system for inducing vibrations in railway bridges

The invention relates to a bridge exciter for inducing vibrations in railway or roadway bridges, which comprises a servo-hydraulic actuator connected to a wagon designed to transport the same over tracks or a road. The actuator generates a force by moving a variable-weight reaction mass guided by linear bearings. It comprises hydraulic equipment that enables direct transmission of the vibrations to the infrastructure, independent of the rolling gear of the wagon or the rubber-tired vehicle, via false wheels. The movement of the actuator piston is controlled by a computer allowing the actuator to apply general forces on a bridge or roadway that do not exceed the maximum acceptable displacement of the piston: harmonic, impulsive, and transient forces. The equipment is provided with the necessary load control elements.

System and method for focusing guided waves beyond curves in test structures

A non-destructive testing system includes directing guided wave energy to regions of interest in waveguides. Knowing the propagation paths taken by guided wave energy in complex waveguides can be used to intentionally insonify regions of interest. Additionally, knowledge of the propagation direction and location of an energy mode in a waveguide allows the calculation of the path previously taken by the energy mode. This information can be used for signal processing of guided wave inspection systems. The test system can have various sensor configurations including: a single transducer configured to direct or receive guided wave energy along a particular direction, a one-dimensional array or a two dimensional array of transducers. The transducers can operate independently to provide mutual phasing and amplitude adjusting to steer guided wave energy in a waveguide or determine the directionality of guided wave energy received by the sensors.

Methods and systems for automated bridge structural health monitoring

In-situ methods and systems for determining bridge load ratings under ambient traffic are provided. These may include, for example, by installing one or more strain gauges on one or more bridge girders a batch of strain readings may be acquired from the one or more strain gauges. From the batch of strain readings, one or more strain time histories may be randomly sampled based, for example, on a girder peak strain. One or more vehicles may be randomly selected based on the one or more stored vehicle parameters by accessing a database with one or more stored vehicles and stored vehicle parameters. A bridge load rating model may be calibrated based on the one or more randomly sampled strain time histories and the randomly selected one or more vehicles for acquiring, in one embodiment, a bridge load rating distribution.

METHOD AND SYSTEM FOR COATING A PIPE

A method and system for evaluating the interior surface and exterior wall conditions of a pipeline while also dynamically installing a repair coating in a pipeline, such as an underground water pipeline. The system is towed into the pipeline and drawn back therethrough. As the system is drawn back, one module in the system evaluates the surface condition of the interior of the pipe and another module evaluates the structural condition of the wall of the pipe. Based on the evaluation data obtained from the two modules an epoxy material is applied to the interior surface of the pipe using a spin cast machine that is drawn behind the two modules. Preferably, a layer of epoxy is applied to the interior surface of the host pipe to the appropriate thickness based on the pipe condition as determined by the two modules. 1. An apparatus for inspecting and coating interior surface walls of a pipe system comprising:a plurality of housings;an umbilical tether for towing said housings through said pipe system and connecting said housings to one another;scanning equipment for evaluating a condition of interior surface walls and a structural condition of said pipe system contained in a first of said housings; anda coating device contained in a second of said housings to apply a coating to said interior surface of said pipe system in response to the evaluations performed by said scanning equipment.2. The apparatus of claim 1 , wherein said housings are spherical.3. The apparatus of claim 1 , wherein said scanning equipment is selected from the group consisting of: cameras claim 1 , laser scanners and sonar.4. The apparatus of claim 1 , further comprising:a control computer connected to said umbilical tether, said control computer receiving and recording data about the condition of said pipeline from said scanning equipment.5. The apparatus of wherein said control computer controls a rate of application of said coating device based on the condition of said pipeline.6. The apparatus ...

GIL FAULT ON-LINE MONITORING SYSTEM BASED ON VIBRATION SIGNALS AND SUPPORT VECTOR MACHINE

A GIL fault on-line monitoring system based on vibration signals and support vector machine, via a monitoring device mounting on the outer surface of the CIL channel, monitors the vibration signals generated on the tube wall during the power transmission process, and perform fault diagnosis through comparison. For example, when the abnormal vibration signals appear near a certain post insulators, then it can be determined that the corresponding location is experiencing a fault. The system is capable of operating without powering off the GIL or disassembling the GIL, thus it is an economic, convenient and effective troubleshooting method with high implementation feasibility. The system can monitor the operation state of the GIL in real time and send information to a monitoring station through a wireless device, and thus guarantees the stable operation of the GIL. 2. The GIL fault on-line monitoring system according to claim 1 , wherein claim 1 , the data collector comprises an amplifier claim 1 , a wave filter claim 1 , an analog-to-digital converter claim 1 , a microcontroller unit and a wireless communication module connected sequentially; the amplifier is connected to the output end of the vibration sensor claim 1 , and the wireless communication module is connected to the wireless gateway through radio signals.3. The GIL fault on-line monitoring system according to claim 1 , wherein claim 1 , the vibration sensor is an acceleration sensor and a +3 dB frequency thereof is ranging from 50 Hz to 15 kHz.4. The GIL fault on-line monitoring system according to claim 1 , wherein the vibration sensor is attached to the shell of the insulator claim 1 , wherein a size and a curvature thereof are adjustable according to a size of the shell of the insulator.5. The GIL fault on-line monitoring system according to claim 1 , wherein claim 1 , radio signals containing time information are sent by the terminal computer to realize time synchronization between data collectors and ...

System for identification and active control of vibrations in a structure and relating method

The present invention relates to a system for identification and active control of vibrations (101) in a structure (103), 11 comprising at least one inertial device (102) associable with the structure (103), comprising at least one movable mass (104) and configured for a first controlled movement of the at least one movable mass (104) in order to excite the structure (103); one or more movement sensors (201) configured for detecting vibrations of the structure (103); at least one processing device (202, 302) operatively connected to the one or more movement sensors (201) and to the least one inertial device (102), the at least one processing device (202, 302) being configured for: identifying a set of first parameters determinable by the one or more movement sensors (201) in response to environment-induced vibrations of the structure (103); identifying a set of second parameters determinable by the one or more movement sensors (201) in response to the first controlled movement of the at last one movable mass (104); calculating a dynamic model, wherein the set of first and second parameters are made consistent taking into account the at least one movable mass (104); detecting threshold-exceeding vibrations of the structure (103) by the one or more movement sensors; controlling the at least one inertial device (102), wherein the at least one inertial device (102) is further configured for a second controlled movement of the at least one movable mass (104), based on the dynamic model. The present invention further relates to a respective method for identification and active control of vibrations in a structure.

Real-time damage determination of an asset

Provided are devices and methods for monitoring a physical asset in real-time based on simulated data being transformed and applied to a virtual asset corresponding to the physical asset. In one example, the method includes receiving a data stream acquired from a structure of an asset being monitored, determining an accumulated damage amount to the asset based on the received information, the determining including performing an incremental rainflow counting algorithm on the received data stream from the asset being monitored, stress transfer function evaluations, and damage calculations with S-N curves, and outputting information concerning the accumulated damage amount of the asset for display on a display device.

TORSIONAL AND LATERAL STIFFNESS MEASUREMENT

A method for determining a spring constant/rigidity of a cantilever of a known shape, the method involving: measuring a resonance frequency of the cantilever in a plurality of static equilibrium positions in which the shape of the cantilever is different and determining a spring constant and/or rigidity of the cantilever using the measured frequencies. The resonance frequency may be at least one of a torsional and lateral resonance frequency. 134-. (canceled)35. A method for determining a spring constant/rigidity of a cantilever of a known shape , the method involving: measuring a resonance frequency of the cantilever in a plurality of static equilibrium positions in which the shape of the cantilever is different and determining a spring constant and/or rigidity of the cantilever using the measured frequencies.36. A method as claimed in claim 35 , wherein the measured resonance frequency is at least one of a torsional resonance frequency claim 35 , or a lateral resonance frequency.37. A method as claimed in claim 35 , wherein both the torsional resonance frequency and the lateral resonance frequency are measured when torsional and lateral modes are coupled.38. A method as claimed in claim 35 , wherein the spring constant is at least one of a torsional spring constant claim 35 , or a lateral spring constant.39. A method as claimed in claim 35 , wherein the rigidity is at least one of a torsional rigidity claim 35 , or a lateral rigidity.40. A method as claimed in claim 35 , wherein in at least one of the plurality of static equilibrium positions the cantilever is bent.41. A method as claimed in claim 35 , further comprising the step of causing the cantilever to move from one static equilibrium position to another by applying a force to the cantilever.42. A method as claimed in claim 41 , wherein the force is substantially perpendicular to a longitudinal axis of the cantilever in its unbent state.43. A method as claimed in claim 41 , wherein the force is applied by a ...

Bridge Structure

The present application discloses a bridge structure comprising first supporting structure, at least one first hollow tube and a first monitor. The first supporting structure comprises bases, first pillars, a first platform. The first pillars are coupled to the bases, wherein each of the first pillars comprises first pillar chords and first pillar girders formed as first pillar trusses with the first pillar chords. The first platform coupled to the first pillars, wherein the first platform comprises a first supporting plane, first platform chords and first platform girders formed as first platform trusses with the first platform chords. The at least one first hollow tube is located between the first pillar trusses or the first platform trusses. The first monitor is located in the at least one first hollow tube, wherein the first monitor is capable of monitoring a bridge stability 1. A bridge structure , comprising: a plurality of bases;', 'a plurality of first pillars coupled to the plurality of bases, wherein each a the first pillars comprises a plurality of first pillar chords and a plurality of first pillar girders formed as first pillar trusses with the plurality of first pillar chords; and', 'a first platform coupled to the plurality of first pillars wherein the first platform comprises a first supporting plane, a plurality of first platform chords and a plurality of first platform girders formed as first platform trusses with the plurality of first platform chords;, 'a first supporting structure comprisingat least one first hollow tube located between the first pillar trusses or the first platform trusses; anda first monitor located in the at least one first hollow tube, wherein the first monitor is capable of monitoring a bridge stability.2. The bridge structure as claimed in claim 1 , wherein the first hollow tube is a pneumatic tube.3. The bridge structure as claimed in claim 1 , wherein the first supporting structure further comprises a plurality of solar ...

Optical fiber sensing systems, methods, structures and applications

Aspects of the present disclosure describe systems, methods and structures and applications of optical fiber sensing. Of significance, systems, methods, and structures according to aspects of the present disclosure may reuse and/or retrofit/upgrade existing optical fiber cables as part of optical fiber sensing that may find important societal application including intrusion detection, road traffic monitoring and infrastructure health monitoring. Combining such optical fiber sensing with artificial intelligence (AI) further enables powerful applications at low(er) cost.

Method and apparatus for less destructive evaluation and monitoring of a structure

Methods and apparatuses for monitoring a first structure at least partially according to properties of a second structure. One such method comprises determining a first relationship between a first variable and a second variable, wherein the first variable represents sizes of actual damage to the second structure, and the second variable represents sizes of simulated damage on the second structure; determining a second relationship between a third variable and a fourth variable, wherein the third variable represents sizes of simulated damage on the first structure, and the fourth variable represents values of a damage index determined for the simulated damage on the first structure; and determining an estimate of damage to the first structure according to the first and second relationships.