工程爆破

2002, (02) 1-5+16

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爆破震动时频分布的小波包分析
ON TIME-FREQUENCY DISTRIBUTION OF BLASTING VIBRATION THROUGH WAVELET PACKET TRANSFORM

林大超,施惠基,白春华,张奇
LIN Da-chao 1,SHI Hui-ji 1,BAI Chun-hua 2,ZHANG Qi 2 (1.Tsinghua University,Beijing 100084,China;2.Beijing Institute of Technology,Beijing 100081,China)

摘要(Abstract):

应用小波包分析研究了短时非平稳爆破震动时频分布规律。首先 ,简要介绍了小波包分析的原理和特点 ;其次 ,给出了一个爆破震动实验的测试结果 ,并应用小波包分析计算了其振动分量的时频分布情况 ;最后 ,对计算结果进行了分析和讨论。研究结果表明 ,爆破震动能量分布处于非常宽的频率范围 ,具有比较确定的多阶固有振动频率 ,同时 ,振动能量随时间的发展表现出剧烈的波动变化。
The time-frequency distribution of blasting vibration being a nonstationary random process with short duration is studied by means of wavelet packet analysis.Firstly,the principle and characteristics of wavelet packet analysis are introduced.Then,the experimental results of a blasting vibration are presented,and their time-frequency distributions are calculated by wavelet packet decomposition method.Finally,a discussion is presented with respect to the presented calculations.The suggested results show that the energy distribution of blasting vibration has a very wide frequency range with deterministic natural frequencies,and sharply fluctuates with time.

关键词(KeyWords): 爆破震动;时频分析;小波变换;小波包分析
Blasting vibration; Time-frequency analysis; Wavelet transform; Wavelet packet analysis

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目 ( 19972 0 13)

作者(Authors): 林大超,施惠基,白春华,张奇
LIN Da-chao 1,SHI Hui-ji 1,BAI Chun-hua 2,ZHANG Qi 2 (1.Tsinghua University,Beijing 100084,China;2.Beijing Institute of Technology,Beijing 100081,China)

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