【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。更多还原

【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.更多还原