Acoustic emission probe type selection method

Abstract

The invention discloses an acoustic emission probe type selection method and belongs to the technical field of rock breaking inspection prediction experiments. The more accurate acoustic emission probe type selection method comprises the following steps: S1, dividing common coal petrography kinds according to lithological characteristics and acoustic emission signal frequencies and utilizing the division as a standard to pre-select resonant frequencies of probes selected by rock specimens; S2, simultaneously utilizing a first acoustic emission probe, a second acoustic emission probe and a third acoustic emission probe in a acoustic emission system to collect acoustic emission signal waveforms in rock breaking experiments, performing Fourier transform, analyzing distribution ranges of dominant frequencies of the three acoustic emission probes and further determining the ideal frequency band of the acoustic emission probe to be selected; S3, combining results of S1 and S2, taking a unionset, determining a distribution range of signal frequencies in a rock specimen breaking process, determining the ideal frequency band of the acoustic emission probe to be selected and further selecting the appropriate acoustic emission probe or acoustic emission problem combination.

Description

technical field [0001] The invention relates to a method for selecting the type of an acoustic emission probe, which belongs to the technical field of rock failure supervisory inspection and prediction tests. Background technique [0002] Rock acoustic emission (AE) is the elastic wave released by the expansion of internal primary cracks and defects and the initiation, initiation, evolution, expansion and fracture of new cracks during the stress process of rock materials. Acoustic emission technology can monitor the destruction process of rock materials in real time. Many scholars have also used acoustic emission technology to monitor the various stages of rock destruction, and achieved good results. But at the same time, during the experiment, the AE results showed diversity, which was related to the selection of different probe types and different setting parameters. [0003] The main frequency of acoustic emission of specimens of the same lithology but different sizes is...

AI Technical Summary

Problems solved by technology

The selection of the same type of probe will inevitably lead to the lack or redundancy of AE signal reception, and the accurate extraction of information in the dominant frequency band cannot be realized, and the rock failure process cannot be accurately represented by acoustic emission parameters

[0004] In the existing acoustic emission research, although the selection of broadband probes can capture the acoustic emission signals in most frequency bands, it is difficult to accurately capture and extract AE signals due to its poor stability and low sensitivity.

The lithology and size of the test piece do not match the type of AE probe, resulting in controversial AE results

Images