爆破地震波时频域分析方法及应用

Method and Application of Blasting Vibration Signal Time-Frequency Domain Analysis

为了研究各时频域分析方法对爆破振动信号时频特征提取的有效性,设计了仿真试验并对不同时频域分析方法进行了对比分析,验证了自适应最优核分布在最大程度抑制交叉项的同时具有较高的时频分辨能力和分辨精度,是适合爆破振动信号时频分析的最佳方法。应用此方法对实测的单段和多段爆破振动信号进行时频分析,结果表明:多段爆破振动信号出现多个能量峰值,并且峰值能量增大、持续时间延长是振动信号叠加的结果。此方法可从信号能量大小和持续时间的角度对爆破振动信号时频特性进行详细解读,为爆破地震效应的深入研究提供实用的分析技术。

In order to study the effectiveness of time-frequency domain analytical method to time-frequency feature extraction of blasting vibration signals,simulation experiments are designed and different time-frequency domain analysis methods are analyzed,identifying that AOK distribution is a optimal method to the time-frequency analysis of blasting vibration signals,which can fully suppress the cross term and has high time-frequency resolving power and resolving accuracy.Applying it to the time-frequency analysis of single and multistage blasting vibration signals,the results show that multistage blast vibration signals appear several energy peaks,the increased energy and lengthened duration are caused by superposition of vibration signal.This method makes detailed interpretation on blasting vibration signals of time-frequency properties from the standpoint of energy size and duration.Our results are of importance for enriching mechanism of waveforms interference for vibration reduction.