爆心距对爆破振动信号频带能量分布的影响

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多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,总结了爆破振动信号频带能量的分布规律,重点探讨了爆心距对爆破振动信号频带能量分布的影响。结果表明,爆破震动信号在传播过程中,其主振频带有往低频发展的趋势,且宽度增加。

Influence of Distance from Blasting Center on Frequency Bands Energy Distribution of Blasting Vibration Signals

Based on the character of short-time non-stationary random signal, the feature of energy distribution of multi-interval-time in millisecond blast signals was investigated by means of the wavelet packet method. Firstly, the characters of wavelet transform and wavelet packet analysis were introduced. Secondly, three single deck blast vibration signals were analyzed by wavelet packet based on software MATLAB and the change of energy distribution curve at different frequency bands was obtained. Finally, the law of energy distribution of single deck blast vibration signals was analyzed and the influence of distance from blasting center on frequency bands energy distribution of blasting vibration signals was principally explored. The results show that the dominant frequency bands of blast vibration signals tend to be low, and its frequency band becomes wider.