| 爆破震动时频分布的小波包分析 |
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| 引用本文： | 林大超,施惠基,白春华,张奇.爆破震动时频分布的小波包分析[J].工程爆破,2002,8(2):1-5,16. |
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| 作者姓名： | 林大超 施惠基 白春华 张奇 |
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| 作者单位： | 1. 清华大学,北京,100084
2. 北京理工大学,北京,100081 |
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| 基金项目： | 国家自然科学基金资助项目 ( 19972 0 13) |
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| 摘 要： | 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。
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| 关 键 词： | 爆破震动 时频分析 小波变换 小波包分析 |
| 文章编号： | 1006-7051(2002)02-0001-05 |
ON TIME-FREQUENCY DISTRIBUTION OF BLASTING VIBRATION THROUGH WAVELET PACKET TRANSFORM |
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| LIN Da-chao ,SHI Hui-ji ,BAI Chun-hua ,ZHANG Qi.ON TIME-FREQUENCY DISTRIBUTION OF BLASTING VIBRATION THROUGH WAVELET PACKET TRANSFORM[J].Engineering Blasting,2002,8(2):1-5,16. |
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| Authors: | LIN Da-chao SHI Hui-ji BAI Chun-hua ZHANG Qi |
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| Affiliation: | LIN Da-chao 1,SHI Hui-ji 1,BAI Chun-hua 2,ZHANG Qi 2 |
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| Abstract: | 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. |
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| Keywords: | Blasting vibration Time-frequency analysis Wavelet transform Wavelet packet analysis |
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