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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 17. Отображено 17.
25-04-2023 дата публикации

Thermal power generating unit pollutant emission control method based on coal quantity variable speed regulation

Номер: CN116006956A
Принадлежит:

The invention relates to a thermal power generating unit pollutant emission control method based on coal quantity variable-speed regulation, which comprises the following steps of: performing nitrogen oxide emission control on an upper-layer coal mill, a middle-layer coal mill, a lower-layer coal mill and a middle-upper-layer coal pulverizing system, and controlling SO2 or dust emission. The method has the beneficial effects that the rotating speed adjusting characteristic of the variable-rotating-speed coal mill is utilized, according to the influence of different coal pulverizing systems and combustion coal types on pollutant generation, rapid coal quantity distribution and coal pulverizing system output adjustment are carried out in the rapid load changing process, pollutant generation is reduced or inhibited from the source side, and the pollution is reduced. The pressure of environmental protection equipment output adjustment under the rapid variable load working condition is relieved ...

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16-05-2023 дата публикации

Method for controlling cold start of boiler through variable-speed regulation of rare earth motor medium-speed coal mill

Номер: CN116116558A
Принадлежит:

The invention relates to a method for controlling cold-state starting of a boiler through variable-speed regulation of a rare-earth motor medium-speed coal mill, which comprises the following steps of: starting the boiler in a cold state, heating the coal mill through a primary air heater until a coal mill starting condition is reached, confirming that tiny-oil or plasma ignition flame detection is normal, and starting the coal mill and a coal feeder; and adjusting the coal feed amount correction coefficient k and the coal mill rotating speed coefficient x according to the boiler heating rate and the boiler boosting rate. The method has the beneficial effects that by reducing the rotating speed of the coal mill, the minimum coal feeding amount limitation of the coal mill is effectively reduced, stable temperature rise and pressure rise of cold-state starting of the boiler are achieved, and the situation that temperature rise and pressure rise are too fast when pulverized coal is fed during ...

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12-02-2003 дата публикации

Ephedra cell ZHJ-25 CGMCCNO.0359 and induction method

Номер: CN0001101467C
Принадлежит:

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02-04-2014 дата публикации

Method for rapidly identifying rotating speed of asynchronous motor based on slot harmonic extraction

Номер: CN103701391A
Принадлежит:

The invention discloses a method for rapidly identifying the rotating speed of an asynchronous motor based on slot harmonic extraction. The method comprises the following steps of primarily extracting slot harmonic according to a stator current signal which is measured in real time by using a synchronous shaft-like filter; eliminating motor harmonic of which the frequency is the closest to that of the slot harmonic, thereby obtaining purer slot harmonic by using a variable frequency average filter; obtaining the frequency of the slot harmonic by using a single-phase phase locked loop, and calculating the rotating speed of the asynchronous motor according to the frequency of the slot harmonic. The method is designed based on a magnetic asymmetry principle of a motor rotor, so that an identification result is insensitive to changes in most of motor parameters; additional signal injection is not required, so that the method is high in universality and transplantability; the method is higher ...

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24-02-2010 дата публикации

Combined piston of gas-oil spring

Номер: CN0100591943C
Принадлежит:

The present invention is a combination of oil and gas piston spring, including Piston Rings , Cover, bearing cap, ring-group throttle and adjustment ring gasket. Bearing cap with the thread through the rod attached to the throttle-group and the adjustment for gasket sets in the back end of the Detroit Piston Ring Cover and connected through the thread. The invention of on the basis the original oil and gas in the spring can change resistance in order to achieve different requirements of the traffic movement. In the absence of the destruction of the cylinder seal, this enables oil and gas spring by the substantial increase in common. Attenuation of the invention can be used body vibration, enhancing vehicle safety, ride comfort and off-road speed.

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07-09-2011 дата публикации

Motor control method based on DCS system

Номер: CN0101667807B
Принадлежит:

The invention relates to a motor control method and discloses a motor control method based on a DCS system. A computer sets motor operation and control parameters via network service so as to operate and control the motor. The DCS system comprises a control motor and an upper computer connected with the control motor, wherein the control motor is connected with a plurality of motors of various types, and a standard motor module is arranged in the control motor. The control method is as follows: firstly setting the equipment parameter, the operation parameter, the starting up and stopping parameter and the fault alarm parameter of each motor; calling the motor subprogram; then calling the standard motor module to perform signal processing and control on different types of motors; after finishing subprogram processing, returning to the body program which controls the motor; and meanwhile, outputting a corresponding control order, the current operation state of each motor and the fault information ...

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18-02-2015 дата публикации

Asynchronous motor key state information tracking method based on improved particle swarm optimization

Номер: CN104362927A
Принадлежит:

The invention discloses an asynchronous motor key state information tracking method based on improved particle swarm optimization. The method includes the steps of firstly, randomly setting a particle swarm in the experience parameter range of a motor; secondly, using the particle swarm optimization to search for a global historical optimal position, and setting the initial position of a water as the optimal position; thirdly, redeploying the particle warm near the watcher, and using the current optimal rule to determine the position updating of the watcher. The improved particle swarm optimization can detect target function change and track parameter change in real time. The method has the advantages that the parameter identification problem of the motor is regarded as an optimization problem, and optional amount of parameters can be theoretically identified and tracked; the classical particle swarm optimization cannot be applied to target function change, and the application range of ...

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05-05-2023 дата публикации

Unit RB control method based on variable-speed coal pulverizing system

Номер: CN116060199A
Принадлежит:

The invention relates to a unit RB control method based on a variable-speed coal pulverizing system, and the method comprises the steps: when an auxiliary machine trips, the operation state of the auxiliary machine is monitored, meanwhile, a generator set control system adjusts the output and the rotating speed of the coal pulverizing system, and different control strategies are adopted for different types of auxiliary machine RBs. The variable-speed coal mill has the beneficial effects that the loading capacity of the variable-speed coal mill can be changed by adjusting the rotating speed of the variable-speed coal mill, so that the variable-speed coal mill adapts to the state of an auxiliary machine of a unit and the target load requirement of the unit. According to the method, RB control has higher flexibility, the running state of the unit can be recovered more quickly while the running safety of the unit is ensured, and the unit electric quantity lost after RB is reduced.

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10-09-2014 дата публикации

Induction motor stator interturn short-circuit detection and coil grade positioning method

Номер: CN104035029A
Принадлежит:

The invention discloses an induction motor stator interturn short-circuit detection and coil grade positioning method which combines a sliding mode variable structure theory and a fault extraction algorithm and realizes effective fault degree extraction based on an any-position fault motor model. The method is simple in calculation, easy to realize, and free from large quantity of beforehand data recording. Therefore, fault degree judgment is completed and at the same time, voltage measurement data is combined to realize coil grade accurate fault positioning.

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26-05-2023 дата публикации

Standard solution for detecting content of iron element in lubricating oil and preparation method

Номер: CN116165190A
Принадлежит:

The invention relates to the technical field of elemental analysis standard substances in lubricating oil, in particular to a standard solution for detecting the content of an iron element in lubricating oil and a preparation method thereof.The standard solution comprises ferrocene and hydrocarbon oil, the ferrocene is a solute, the hydrocarbon oil is a solvent, the ferrocene is dissolved in the hydrocarbon oil, the concentration of the Fe element in the standard solution is 1000 micrograms/g, and the concentration of the Fe element in the standard solution is 100 micrograms/g. Ferrocene is dissolved in hydrocarbon oil to prepare a standard solution, and the standard solution is simple in composition, low in cost, convenient to prepare, stable in structure and easy to store.

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15-07-2015 дата публикации

Rotor fault diagnosis method giving comprehensive consideration to current and voltage of motor

Номер: CN104777396A
Принадлежит:

The invention relates to a rotor fault diagnosis method giving comprehensive consideration to current and voltage information of a motor and calculating a fault index for evaluating fault severity of a rotor according to the current and voltage information. The index can achieve diagnosis and quantification of a broken bar fault of the motor rotor. The method gives the comprehensive consideration to voltage and current signals, eliminates influence of a control strategy and a control parameter of the motor on a diagnostic result since the influence of the control strategy and the control parameter finally affects voltage of the motor, while the voltage is considered in the method; load and torque changes have smaller influence on the fault diagnosis index; at the same time, the method does not increase hardware expenditure of a system; a fault diagnosis program of the method can be embedded into a controller of an inverter; and the method can achieve on-line rotor fault diagnosis and has ...

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10-03-2010 дата публикации

Motor control method based on DCS system

Номер: CN0101667807A
Принадлежит:

The invention relates to a motor control method and discloses a motor control method based on a DCS system. A computer sets motor operation and control parameters via network service so as to operateand control the motor. The DCS system comprises a control motor and an upper computer connected with the control motor, wherein the control motor is connected with a plurality of motors of various types, and a standard motor module is arranged in the control motor. The control method is as follows: firstly setting the equipment parameter, the operation parameter, the starting up and stopping parameter and the fault alarm parameter of each motor; calling the motor subprogram; then calling the standard motor module to perform signal processing and control on different types of motors; after finishing subprogram processing, returning to the body program which controls the motor; and meanwhile, outputting a corresponding control order, the current operation state of each motor and the fault information ...

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14-01-2015 дата публикации

Motor rotor fault diagnosis method based on field-orientated control

Номер: CN104280682A
Принадлежит:

The invention discloses a motor rotor fault diagnosis method based on field-orientated control. According to the motor rotor fault diagnosis method, calculated torque current of a controller is used for calculating the amplitudes of a direct current component and an alternate current component of the torque current, the number of broken bars of a rotor of a motor is further obtained, and therefore accurate detection and quantization of the broken bars of the rotor of the motor are realized. The motor rotor fault diagnosis method neither needs additional hardware nor increases the system cost; meanwhile, a diagnosis result is not sensitive to motor rotation speed changes or load torque changes, and the diagnosis process does not need parameters except the total number of guide bars of the rotor, so that the diagnosis result is high in robustness, and the motor rotor fault diagnosis method is quite suitable for a rotor-field-orientated control motor system.

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18-04-2023 дата публикации

Method for controlling pulverized coal concentration of medium-speed coal mill in real time through variable-speed adjustment of rare earth motor

Номер: CN115970865A
Принадлежит:

The invention relates to a method for controlling the pulverized coal concentration of a medium-speed coal mill in real time through variable-speed adjustment of a rare earth motor. The method comprises the steps that operation tests of different rotating speeds and different coal mill inlet primary air volumes are conducted on the coal mill under the conditions of the same coal type and the same coal feeding amount; the original air-coal ratio curve of the coal pulverizing system is optimized; and obtaining an air-coal ratio curve of the coal mill at different rotating speeds. The method has the beneficial effects that the optimal air-coal ratio curve corresponding to the coal mill at each rotating speed is provided according to different rotating speed states of the variable-speed adjusting coal mill, real-time control over the pulverized coal concentration of the medium-speed coal mill is achieved, and the ignition and combustion stability of the pulverized coal at each rotating speed ...

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28-04-2023 дата публикации

Method for improving low-load stable combustion capacity of boiler by adjusting medium-speed coal mill at variable speed of motor

Номер: CN116020651A
Принадлежит:

The invention relates to a method for improving the low-load stable combustion capacity of a boiler by adjusting a medium-speed coal mill through a motor in a variable speed mode. The method comprises the steps that low-load operation tests of the same coal type, the same coal feeding amount, different rotating speeds and different coal mill inlet primary air volumes are conducted on the coal mill in the states of 40% BMCR and below; under the low-load working condition, the coal feeding amount and rotating speed control mode of the coal pulverizing system is optimized, and the coal feeding amount and rotating speed control mode during low-load operation of the boiler is obtained; and optimizing the air-coal ratio curve, the coal feeding amount and the rotating speed control mode of the coal pulverizing system during the low-load operation period of the boiler. The method has the beneficial effects that when the deep peak regulation load of the unit is under the working condition of 40% ...

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08-12-2010 дата публикации

Transmission control method for rewinding machine

Номер: CN0101905821A
Принадлежит:

The invention relates to a transmission control flow for a rewinding machine and discloses a transmission control flow for a papermaking rewinding machine, comprising the following steps: controlling an unwinding roll (1), a front bed roll (2), a rear bed roll (3), curved rolls (6,7,8), a dancer roll (5) arranged on a paper roll (12), a feed roll (4) and a paper cutter (9); carrying out transmission control by adopting a control state conversion mode; and dividing the operation process and security protection function of rewinding machine transmission control into an operational control stateand a protective control state. The invention is characterized in that a modular design is adopted aiming at the control flow of the traditional papermaking rewinding machine, thus improving the generality of the control flow; multiple control states are set, thus control information quantity is increased, the operating steps are simplified, maintenance and diagnosis are convenient, the operatingperiod ...

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20-07-2011 дата публикации

Sealing combination device of oil-gas spring

Номер: CN0101070892B
Принадлежит:

The invention relates to a sealed combination device for oil gas spring, the device concludes compaction part, tie-in assembly or end assembly and locknut. The tie-in assembly or end assembly are pressed by compaction part axial locked by locknut.. Using the oil and gas spring of the invention can significantly reduce oil spills, leakage phenomenon, thereby effectively enhance the anti-leakage ofoil and gas spring reliability to ensure that the crew and vehicle traffic safety.

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