煤矿冻结立井爆破振动信号时频特征精细化提取
Fine Extraction of Time-frequency Characteristics for Coal Mine Frozen Vertical Shaft Blasting Vibration Signals
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摘要: 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。Abstract: Through FSWT (Frequency Slice Wavelet Transform), we carried on fine time-frequency feature extraction for frozen shaft blasting vibration signal, and using the characteristic that its inverse transformation can cut any frequency range, six reconstructing sub-band signals are refined, and we get all the sub-band energy percentage and the correlation coefficient of the original signals. The results show that: frozen vertical shaft blasting vibration signal belongs to the more high broadband non-stationary random vibration, and the energy is mainly distributed below the 500 Hz, energy ratio is 99.02%; peak vibration amplitude and energy ratio decrease with the increase of frequency, sub-band signal energy percentage and its correlation coefficient has positive correlation relation.
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