单段爆破振动信号频带能量分布特征的小波包分析

爆破振动分析是研究爆破振动危害控制的基础,也是控制爆破振动危害的前提。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满足分析要求的单段微差爆破振动信号的能量分布特征进行研究。首先,简略地介绍了小波变换与小波包分析的特点。其次,基于MATLAB对单段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,总结了单段爆破振动信号频带能量的分布特征。结果表明,在单段爆破中,爆破震动信号成分主要以中高频(39Hz~156Hz)为主,低频成分(39Hz以下)所占比例极少。

Features of Energy Distribution of Single Deck Blast Vibration Signals with Wavelet Packet Analysis

Blast vibration analysis is a foundation for studying control of blast vibration damage and provides a prerequisite to controlling blast vibration. Based on the characteristic of a short-time non-stationary random signal, the feature of energy distribution of a single deck blast vibration signal is investigated by means of wavelet packet method. Firstly, the characteristics of wavelet transformation and wavelet packet analysis are introduced briefly. Secondly, three single deck blast vibration signals are analyzed by wavelet packet based on software MATLAB, and change of energy distribution curves at different frequency bands are obtained. Finally, the change law of energy distribution of single deck blast vibration signals is analyzed. The results show that the dominant frequency componems of single deck blast vibration signals are concentrated at the higher frequency band(39 Hz-156Hz)and the ratio of the energy of low frequency components(less than 39 Hz) to the total energy is lower.