Acoustic emission source localization method based on step-by-step time reversal technology and time domain spectrum unit

By using step-by-step time inversion technology and time domain spectral units in the reinforced wall panel structure, the acoustic emission source is positioned, and the problems of insufficient accuracy and out of focus in the existing technology are solved, and high-precision and fast acoustic emission source positioning are achieved.

CN114674930BActive Publication Date: 2025-03-25YANGTZE RIVER DELTA RES INST OF NPU TAICANG
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Patent Information

Application Number
CN202210152499.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-02-18
Publication Date
2025-03-25
Estimated Expiration
2042-02-18

AI Technical Summary

Technical Problem

The existing acoustic emission source positioning technology has insufficient accuracy and out-of-focus problems in the reinforced wall structure. Especially when the signal quality is average, the measurement of TOF poor will introduce large errors, resulting in inaccurate positioning results.

Method used

The acoustic emission source positioning method based on step-by-step time inversion technology and time domain spectral unit is adopted. By pasting the PZT sensor in the area to be monitored, the lead-breaking experiment is recorded, the main channel is identified, the three-dimensional time domain spectral unit grid is established, and time inversion and wavefield calculation are carried out in two steps to achieve high-precision positioning of the acoustic emission source.

Benefits of technology

It improves the accuracy of positioning of the acoustic emission source, overcomes the out-of-focus problem and the dragon grid effect in traditional methods, can quickly calculate the propagation of elastic waves in the structure, and is suitable for complex structures such as reinforced wall panels.

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Abstract

The present application discloses a method for locating an acoustic emission source based on a step-by-step time reversal technique and a time domain spectrum unit, which includes the following steps in sequence: S1, four PZT sensors are respectively pasted at the center of each rib grid of the reinforced wall panel to be monitored, and the cables of each PZT sensor are connected to the data acquisition system; S2, a lead breaking experiment is performed at any position in the area to be tested, and the response of each PZT sensor is recorded by the data acquisition system; S3, according to the trigger time of the response on each PZT sensor, the PZT sensor closest to the acoustic emission source is identified, and its response channel is recorded as the main channel; etc. The present invention can quickly calculate the propagation of elastic waves in the structure and greatly improve the positioning accuracy.
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