Acoustic emission source localization method and system

Abstract

The invention discloses an acoustic emission source location method and system, in which n+1 non-coplanar acoustic emission sensors are arranged in the monitoring system, wherein n≥5; one of the acoustic emission sensors is used as a reference sensor S 0 , whose coordinates are marked as (x 0 ,y 0 ,z 0 ); another n acoustic emission sensors S i The coordinates are marked as (x i ,y i ,z i ), i=1,2,...,n; record the time when n+1 acoustic emission sensors receive the acoustic emission signal; transform the nonlinear acoustic emission source distance time equation into a linear equation, and obtain a linear equation group, with each The goal is to minimize the sum of squared weights of the residuals of the equation, construct an objective function, and embed the correlation between AE parameters to obtain the AE source coordinates (x, y, z). The invention is easy to realize, and has high positioning accuracy and calculation efficiency.

Description

technical field [0001] The invention relates to a method and system for locating an acoustic emission source. Background technique [0002] Acoustic emission positioning technology is widely used in the field of rock mechanics. Accurately determining the location of the acoustic emission source is crucial to the study of rock mass damage and crack propagation mechanism and the determination of the location of rockburst. In order to improve the positioning accuracy of acoustic emission sources, scholars have proposed many positioning methods, but most of these methods need to pre-specify the medium wave velocity. A large number of experiments and engineering practices have shown that there is often a large deviation between the measured medium wave velocity and the real wave velocity. For example, in the process of rock mechanics testing, with the continuous expansion and penetration of cracks and voids during the loading process, the average wave velocity of the medium will ...

AI Technical Summary

Problems solved by technology

However, they are still affected by many factors. Among them, the iterative positioning method needs to pre-specify a more accurate iterative initial value, which greatly limits its application. If the initial value is given a large deviation, this method is easy to cause iteration non-convergence or slow convergence

Although the analytical positioning method can avoid the above problems, it is only suitable for the positioning of the acoustic emission source with a fixed geometry. The sensor needs to be placed at a specific position, and the positioning accuracy is not high.

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