基于小波变换的爆破振动信号能量分布特征分析

Analysis on features of energy distribution for blasting seismic wave based on wavelet transform

为了深入研究爆破地震波特性,应用小波变换方法对具有短时非平稳特点的爆破振动信号进行了能量分布特征分析。根据小波变换的时-频特性和分层分解展开关系,将爆破振动时间历史信号用分层重构信号进行扫描,应用这些信号得到了不同频率带上爆破振动的相对能量分布和振动强度的时间变化规律。爆破振动信号实测结果分析表明,基于小波变换的能量分布特征分析可以更准确地给出爆破振动信号的细节信息。研究结果为分析爆破振动结构安全性提供了新的途径。

The features of energy distribution for blasting seismic wave which is short-time non-stationary random signal are analysed by wavelet transform technique. According to the time-frequency characteristic and multiresolution decomposition of discrete wavelet transform, the signal history of blasting seismic wave is expressed by different level reconstructed signals of wavelet decomposition. By using these signals, the relative energy distribution of blasting seismic wave in different frequency bands and the regularity of vibration strength varying with time is obtained. Blasting seismic wave measurement shows that the time-frequency characteristic analysis based on wavelet transform yields more accurate information of blasting seismic wave. The suggested method provides a new approach for analyzing the structural safety under blasting vibration conditions.