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科技导报  2014 

基于LCD分解的微震信号分析与识别

DOI: 10.3981/j.issn.1000-7857.2014.27.008, PP. 49-55

Keywords: 微震,LCD,Hilbert变换,信号分析

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Abstract:

针对矿山微震监测信号识别难,识别速度慢的问题,引入新的非平稳信号的分析方法——局部特征尺度分解法(LCD),该方法可以自适应地将一个复杂的信号分解为若干个瞬时频率具有物理意义的内禀尺度分量(ISC)之和。与传统的经验模态分解(EMD)相比,LCD计算的效率更高,并能更好地抑制端点效应。分别对矿山典型的岩石破裂微震信号和爆破振动信号进行LCD,结果表明,2种信号均得到了有效的分解。对各ISC作频谱分析表明,2种信号在频率分布上存在较大差异。对各ISC作Hilbert变换,得到的能量分析结果表明,2种信号在能量分布上也存在较大差异。该方法为快速、准确地识别微震信号提供了新的途径。

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