基于小波变换的微差爆破震动信号分离法

采用震波叠加模拟法确定合理的微差延期时间，关键在于能否获取组成实测微差爆破震波的分段震波。基于小波变换的微差爆破震动信号分离法能较好地解决上述问题。首先，利用基于小波分析的时-能密度法，通过从实测爆破震动信号中识别出各段雷管实际的起爆时刻点，得到了爆破中所用雷管的实际延期时间。其次，利用信号时一频转换技术。从实测微差爆破震动信号中分离出各分段震波。最后，通过比较各分段震波在不同延期时间下的叠加效果，可以得到微差爆破的较优微差延期时间。以某地下工程爆破震动信号进行分析为例，对本方法的有效性作了检验。

The Separating Means of Millisecond Blasing Vibration Signal Based on Wavelet Transform

The key to ascertaining reasonable delay time interval by the means of seismic waves superposition effect is to get each sub- signal from measured millisecond blast vibration signal . The separating means of millisecond blast vibration signal based on wavelet transform can solve successfully the problem mentioned above. Firstly, the authors make use of time-energy density analysis based on wavelet transform and get the real delay time by Mentifying the blast moment of shortdelay detonators. Secondly, every sub-signal is separated from measured millisecond blast vibration signal by time-frequency domain transform techniques. Lastly, the optimized delay time interval is obtained by comparing the superposition effect of sub-signal in different delay time interval. The effectiveness of the proposed method is verified with time-energy density analysis of millisecond blasting vibration signals in a underground engineering.