Pavement collapse degree detection method and system suitable for different roads

The invention discloses a pavement collapse degree detection method and system suitable for different roads. The system comprises a road information acquisition module, an image information acquisition module, an environment information acquisition module, an earthquake information acquisition module, a data receiving module, a data processing module, a master control module and an information sending module. The road information acquisition module is used for acquiring road information, and the road information comprises road surface information and road construction duration information; the image information acquisition module is used for acquiring road image information, the environment information acquisition module is used for acquiring environment information of a road, and the earthquake information acquisition module is used for acquiring earthquake information of the position of the road; the data receiving module is used for receiving the road information, the road image information ...

Underground disease object identification method based on neural network

The invention discloses an underground disease object identification method based on a neural network, and particularly relates to the technical field of the neural network, and the method comprises the following steps: carrying out the image collection of a ground disease, collecting the waveform image data of an underground disease through a radar, carrying out the matching of the waveform image of the ground disease and the waveform image of the underground disease, and carrying out the recognition of a target object. The method comprises the following steps: randomly selecting a part of samples as sample training data, calculating a reflection coefficient according to a formula, judging the existence of a void layer according to the reflection coefficient, calculating the depth of an underground reflector according to the formula, calculating the wave velocity of electromagnetic waves according to the formula, establishing an identification item of a disease body, and carrying out batch ...

Full-helicopter anti-crash hierarchical simulation method

The invention belongs to the technical field of helicopter designs and analysis, and relates to a full-helicopter anti-crash hierarchical simulation method. The full-helicopter anti-crash hierarchical simulation method comprises the following steps: using a finite element analysis pre-processing software Patran, and respectively establishing a flexible landing gear simulation model, a helicopter fuselage rigid material model and an anti-crash seat rigid material model, then using a transient dynamics analysis software Dytran to carry out helicopter crash simulation, and then removing a landing gear model, using the finite element analysis pre-processing software Patran, changing the helicopter fuselage rigid material model to a fuselage flexible model, then removing a fuselage model, using the finite element analysis pre-processing software Patran, changing the seat rigid material model to a flexible model, and finally completing the full-helicopter anti-crash simulation. The full-helicopter ...

Composite material structural strength analytical method

The invention belongs to the material analysis technology and relates to a method for improving the precision for analyzing the structural strength of composite material, comprising the following steps: geometry description is carried out to a composite material structure used as an analysis object, an overall finite element model is built according to variation principle and segmentation approximate principle, and then the overall finite element strength analysis is carried out; displacements and stress results of all nodes, obtained by overall stress analysis, are stored and displayed in vector-form displacement field and force field forms; and then mesh refinement is carried out to an important part, a local finite element model is built, a boundary condition obtained by overall stress analysis is applied to a boundary node of the local finite element model in vector-form displacement field and force field forms, and then further local finite element strength analysis is carried out.

Box-type composite material fuselage structure of helicopter

The invention belongs to the technical field of helicopter structure parts and particularly relates to a composite material fuselage structure. The composite material fuselage structure comprises a side wall plate (1), a support framework (2) and a skin (3), and is characterized in that the side wall plate (1) adopts a cuboid box-type structure; the skin (3) is a double curved surface arc-shaped plate positioned on the outer side of the side wall plate (1); the height of the skin is coincident to that of the side wall plate (1); an upper side and a lower side of the skin (3) are in bond-riveted connection with the side wall plate (1); the support framework (2) is located in the side wall plate (1), and is in bond-riveted connection with the side wall plate (1). The box-type composite material fuselage structure of the helicopter is compact in structure layout and is capable of making full use of the characteristic that the composite material is adaptive to the large-area integral forming ...

FLEXIBLE PRINTED CIRCUIT BOARD BONDING APPARATUS

Ceramic/composite material interlayer protecting structure

The invention belongs to a design technology of protecting structures and relates to an improved /composite material protecting structure, which comprises a ceramic panel (1) and a rear panel bonded with the ceramic panel (1). The ceramic/composite material interlayer protecting structure is characterized in that the rear panel is an interlayer panel which comprises two fiber reinforced resin base composite material plates (2) and a foam aluminum plate (3) clamped between the two fiber reinforced resin base composite material plates, and the fiber reinforced resin base composite material plates (2) and the foam aluminum plate (3) are formed into the interlayer plate bonded by plate cores. The interlayer structural rear panel provides support with greater rigidity for the ceramic panel under the condition of same planar density and fully plays a role of high compression strength of ceramic materials. Closed cell aluminum in the interlayer structure can also delay the transmission of shock ...

Helicopter skid landing gear falling collision simulation analysis method

The invention belongs to the field of helicopter design, and particularly relates to a helicopter skid landing gear falling collision simulation test method. At present, when a skid landing gear is designed, whether performance of the landing gear meets related requirements of voyage standards or military standards or not is verified mainly through tests. In the initial stage of design of the landing gear, due to the fact that the design scheme often needs to be repeatedly changed and improved, the research and development time is greatly lengthened through an existing method, the cost is quite high, and the research and development risk is increased. According to the helicopter skid landing gear falling collision simulation analysis method, test verification in the design process of the landing gear is replaced by the method of computer simulation analysis, the research and development time is shortened, and the research and development cost is reduced.

Vacuum ultraviolet monochromator for plasma density diagnosis

The invention relates to the technical field of plasma density diagnosis instruments of magnetic confinement fusion experimental devices, in particular to a vacuum ultraviolet monochromator for plasma density diagnosis. Comprising a vacuum cavity, an inlet slit, an inlet slit fixing mechanism, a collimating lens, a collimating lens adjusting mechanism, a grating, a grating adjusting mechanism, a focus lens, a focus lens adjusting mechanism, a detection module and a plurality of fixing bolts. According to the invention, the breakthrough of centimeter-magnitude spatial resolution of conventional beam emission spectrum diagnosis can be realized, so that the spatial resolution of beam emission spectrum diagnosis reaches the sub-centimeter magnitude; and higher luminous flux and signal-to-noise ratio are obtained while the microsecond magnitude time resolution is maintained. Therefore, high-temporal-spatial-resolution accurate measurement of plasma density fluctuation is realized.