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通过频率切片小波变换(Frequency Slice Wavelet Transform,FSWT)对采集到的冻结立井爆破振动信号进行了精细化时频特征提取,并利用其逆变换能切割任意频率区间的特点,重构出6个更为细化的子频带信号,得到各子频带占原信号的能量百分比和相关系数。研究结果表明:立井爆破振动信号属于更加高宽频的非平稳随机振动,其能量主要都分布于500 Hz区域内,所占能量为99.02%,随着频率的升高,振速峰值和能量百分比不断降低,信号子频带能量百分比与其相关系数成正相关。
Frequency-domain Wavelet Transform (FSWT) is used to extract the refined time-frequency characteristics of blasting vibration signals of frozen vertical wells. The inverse transform can be used to cut the frequency range of any frequency and reconstruct six more For the refined sub-band signal, the energy percentage and the correlation coefficient of each sub-band to the original signal are obtained. The results show that the vibration signal of shaft blasting belongs to the non-stationary random vibration with higher and higher frequencies. The energy is mainly distributed in the area of 500 Hz and the energy is 99.02%. As the frequency increases, the peak value of vibration velocity and energy percentage Decreases, and the signal sub-band energy percentage has a positive correlation with its correlation coefficient.