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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。
In acoustic emission positioning, according to the actual positioning requirements, the frequency of signal decomposition after the selection of good or bad will have an impact on the location of the rock rupture point. In response to this problem, the main frequency of AE decomposition signal is explored. The best subband frequency signal is found from the full phase FFT analysis by the lead-off experiment on 50mm × 100mm × 50mm granite. Using multiple cross-correlation techniques to achieve accurate positioning, and at the same time to do the simulation experiments of different frequency reconstruction coefficients. The results show that the selection of the dominant frequency of the reconstruction coefficients of different layers has a direct impact on the location of the AE signal source, so as to find out the reasons for the positioning calculation problem due to the improper selection of the main frequency signal.