System and method of load identification based on restrained edge strain extreme value coordinates

An identification method and strain value technology, applied in the field of load identification systems, can solve the problems of difficulty in directly obtaining measured data, and difficulty in determining the configuration form of related sensor networks, achieving the effects of universality, simple structure and simple layout.

Active Publication Date: 2013-04-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

As the actual monitoring occasions and bearing forms become increasingly complex and changeable, it is not only difficult to dir

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  • System and method of load identification based on restrained edge strain extreme value coordinates
  • System and method of load identification based on restrained edge strain extreme value coordinates
  • System and method of load identification based on restrained edge strain extreme value coordinates

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0034] The load identification system and method based on the constrained edge strain extremum coordinates are as follows: image 3 As shown, including FBG (Fiber Bragg Grating, Fiber Bragg Grating) sensor, Si425 grating demodulator, computer. The input end of the Si425 grating demodulator is connected to the sensor used to measure the strain value of the bridge structure, and the output end is connected to the computer. The Si425 grating interrogator converts the strain value measured by the FBG (Fiber Bragg Grating, Fiber Bragg Grating) sensor into the extreme strain coordinates of the plate and shell structure. According to the extreme stress coordinates obtained by the analysis of the grating demodulator, a program for calculating the position coordinates of the loading point is written in MATLAB, and the position coordinates of the loading point are calculat...

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Abstract

The invention discloses a system and a method of load identification based on restrained edge strain extreme value coordinates, belonging to the technical field of monitoring of a board shell structure. The system comprises sensors used for measuring the strain value of the board shell structure, a data processor and a computer. The method comprises the following steps: firstly establishing a mapping relation between load point coordinates and corresponding strain extreme value coordinates; then uniformly arranging the sensors along the edge of the board shell structure, and measuring the corresponding strain extreme value coordinates of the load point to be determined; then requiring to find a sample load node at a minimum distance from the corresponding strain extreme value coordinates of the load point to be determined; and finally calculating to obtain the coordinates of the load point to be determined according to reverse distance-weighted differential method. The system has the advantages of being simple in structure and simple in arrangement of the sensors. According to the method, through the collection of strain extreme value coordinates, the determination method of the load point is simplified, and the method has universality for the structures of different material parameters.

Description

technical field [0001] The invention discloses a load identification system and method based on constrained edge strain extremum coordinates, and belongs to the technical field of plate and shell structure monitoring. Background technique [0002] The plate and shell structure is an important typical structure in the aircraft. The research results of Nanjing University of Aeronautics and Astronautics Lu Guan and others show that the validity of the sensor network signal and the correctness of the sensor network coverage position depend on the sensitive area of ​​the sensor network. The distribution of sensors needs to be analyzed firstly by analyzing the characteristics of the overall structural state, and the algorithm matching the structure is used to optimize the distribution of sensors. In addition, commonly used construction methods for sensor distribution include effective independence, Guvan model reduction method. The effective independence method starts from all po...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 曾捷穆昊李继峰周雅斌张倩昀
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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