AE分解信号主频选择对岩石定位的影响

Influence of Dominant Frequency Selection after AE Signal Decomposition on Rock Location

在声发射定位中,根据实际定位要求,信号分解后的主频选择好坏对岩石破裂点的定位会产生影响。针对这一问题,对AE分解信号主频进行了探索,通过在50mm×100mm×50mm花岗岩上的断铅实验,从全相位FFT分析中找到最佳的子带主频信号,从而得到波峰峰值,利用多次互相关技术实现准确定位,同时做不同层重构系数主频信号的仿真比较实验。结果表明:不同层重构系数主频的选择对声发射信号源定位有着直接影响,从而找到了因主频信号选择不当造成定位计算出现问题的原因。

According to the requirements of acoustic emission location, the dominant frequency after signal decomposition had an influence on the location of rock rupture point. Ai- ming at this problem, the dominant frequency was explored. The granites with the size of 50 min× 100 min× 50 mm were used for lead breaking experiments. The best subband signal was found out from all phase FFT to obtain the peak value. The multiple cross correlation was used to realize the accurate location. Meanwhile, the comparative simulation experiments of dominant frequency with different layer re- construction coefficients were conducted. The results showed that the dominant frequency with different layer reconstruc- tion coefficients had a direct influence on signal source loca- tion of acoustic emission, so that the reason was found out for the problem of positioning calculation caused by improper selection of main frequency signals.