A Shock Location Method for Plate Structures Based on the Principle of Time Reversal Method

Abstract

The invention discloses a plate structure impact positioning method based on the principle of a time reversal method, and belongs to the field of structure health monitoring. The method comprises thefollowing steps: step 1: laying out a piezoelectric sensor; step 2: obtaining a plate structure impact response transfer function; step 3: performing time reversal data processing on an impact response signal of a sensor of an impact event; step 4: extracting a reconstructed impact signal characteristic value parameter; and step 5: determining an impact position by using the characteristic value parameter. According to the positioning method disclosed by the invention, impact positioning is performed by making full use of the information contained in the transfer function, the wave speed, structure material properties or mechanical boundary conditions in a known structure are not required, the stability is good, the time and space information in the positioning method can be complementary,the plate structure impact positioning can be realized just by using 1-2 sensors, and the plate structure impact positioning method it has a broad application prospect in the impact monitoring of aerospace structures.

Description

technical field [0001] The invention belongs to the technical field of impact monitoring of structural health monitoring, and proposes a plate structure impact positioning method based on the principle of time reversal method. Background technique [0002] The structure of aerospace vehicles will inevitably be threatened by external impacts during service, such as space debris, flying birds, projectiles / chips, hail and dropped tools, etc. Most aerospace vehicle structures are plate structures, impact damage will significantly reduce the mechanical properties of the structure and reduce its service life, especially the composite material structure. Conventional non-destructive testing techniques, such as radiographic testing, ultrasonic testing, magnetic particle testing, etc., mostly need to be carried out on the ground and disassemble the local structure, which takes a lot of manpower and time. [0003] The shock position and load time history are identified through the sh...

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Problems solved by technology

[0008] In order to solve the problem that many known conditions are required and the calculation process is complicated for independent shock location and shock load reconstruction, the present invention provides a shock location method based on the principle of time reversal method, based on the principle of time reversal method, and other Compared with the recognition method, the transfer function obtained by the experimental calibration can be used for shock location and shock load reconstruction at the same time. The recognition of the shock location does not require information such as the wave velocity in the known structure, and only 1-2 sensors are needed for shock location. , good anti-noise performance, convenient and reliable, strong practicability, suitable for impact positioning of plate structures of different materials and shapes, such as impact positioning of complex plate structures such as stiffened plates and composite material plates, and can be applied to impact positioning of external structures of aerospace vehicles

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