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采用频率切片小波变换技术(frequency slice wavelet transform,FSWT)对典型的矿山岩体微震信号和爆破振动信号进行了研究。首先利用FSWT分解一组信号,对两类波形进行了时频特性分析;然后利用其逆变换能切割任意频率区间的特点,构造6个连续的子频带并得到重构信号,并通过划分更细化的子频带,进行了两类信号不同的能量分布特性对比研究。研究结果表明:该矿山岩体微震信号和爆破振动信号的能量主要都分布于100 Hz以下,其中岩体微震信号的能量主要集中在0~50 Hz,爆破振动信号则主要集中在50~100 Hz;对于高于100 Hz区域,爆破振动信号所占能量比例更大。
The typical microseismic signals and blasting vibration signals of mine rock mass are studied by using frequency slice wavelet transform (FSWT). Firstly, a series of signals are decomposed by FSWT to analyze the time-frequency characteristics of the two types of waveforms. Then, the inverse transform can cut the characteristics of any frequency range, construct six consecutive subbands and reconstruct the signal, The comparison of the different energy distribution characteristics of the two types of signals is carried out. The results show that the energy of the rock mass microseismic signal and blasting vibration signal are mainly distributed below 100 Hz, of which the energy of rock mass microseismic signal is mainly concentrated in 0 ~ 50 Hz and the blasting vibration signal is mainly concentrated in 50 ~ 100 Hz ; For the area above 100 Hz, the blasting vibration signal accounts for a larger proportion of energy.