地下工程爆破振动信号能量分布特征的小波包分析

The features of energy distribution for blast vibration signals in underground engineering by wavelet packet analysis

根据爆破振动信号具有短时非平稳的特点 ,利用小波包分析技术对地下工程爆破振动信号的能量分布特征进行了研究。首先 ,简略介绍了小波变换与小波包分析的特点 ;其次 ,基于MATLAB(MaterialsLab oratory)对段药量和爆源距离等不同条件下记录的 8条爆破振动信号进行小波包分析 ,得到了爆破振动信号在不同频带上的能量分布图 ;最后 ,分析了爆破振动信号能量的分布特征。本分析手段为研究地下工程爆破地震效应特别是振动速度

Based on the character of short time non stationary random signal, this paper studies the features of energy distribution for blast vibration in underground engineering by means of the wavelet packet analysis technique. Firstly, the characters of wavelet transform and wavelet packet analysis are briefly introduced. Secondly, eight vibration signals measured under different charge weight, distance between the explosion and measuring point etc. are analyzed by using the wavelet packet based on MATLAB(Materials Laboratory), and results of energy distribution for different frequency band are provided. Finally, some features of energy distribution of blast vibration signals are indicated. It is shown the method provides an effective tool for studying blast seismic effect in underground engineering, specially, for constituting velocity frequency criteria.