Elastomeric structure acoustic emission source location method and apparatus

By dividing the projectile into regions and arranging the sensor array, and combining the exhaustive method and the least squares approach, the problem of insufficient positioning accuracy of the acoustic emission source of the projectile structure was solved, and dynamic damage monitoring and positioning of complex structures were realized.

CN116448882BActive Publication Date: 2026-07-03BEIHANG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Filing Date
2023-04-04
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In existing technologies, the acoustic emission source localization method for projectile structures is not accurate enough for complex structures, especially the head structure. Due to the refraction and reflection of acoustic emission waves, the propagation path cannot be determined, which affects the localization accuracy.

Method used

By dividing the projectile into regions, arranging an array of acoustic emission sensors, and collecting acoustic emission signals, the exhaustive method and the least squares approach are used, combined with the acoustic emission arrival time difference and wave propagation speed, to traverse and search multiple regions to determine the position with the smallest error as the acoustic emission source.

Benefits of technology

It improves the accuracy of locating acoustic emission sources in projectile structures, enables dynamic damage monitoring and location of complex structures, and solves the problem of uncertain propagation paths.

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Abstract

The application relates to a method and device for positioning a structure acoustic emission source of a projectile, wherein the method comprises the following steps: dividing a projectile according to a structure form to obtain a plurality of projectile division regions; collecting an acoustic emission signal of each projectile division region; performing grid division required by a positioning algorithm on a detection region of the projectile structure, and simultaneously performing exhaustive search on the plurality of division regions based on an acoustic emission time difference and a wave propagation speed; comparing positioning errors of the exhaustive search of the division regions, and selecting a position with the minimum error as an acoustic emission source position. Thus, the problems in the prior art that the positioning accuracy of a region positioning method is insufficient, and the time difference positioning method cannot determine the propagation path due to refraction, reflection and other phenomena at the combined interfaces of different geometric structures of an irregular complex structure formed by a plurality of shapes, resulting in poor positioning accuracy are solved.
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