岩石声发射信号能量分布特征的EMD分析

凌同华;张胜;易志强;李品钰

振动与冲击 ›› 2012, Vol. 31 ›› Issue (11) : 26-31.

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (11) : 26-31.
论文

岩石声发射信号能量分布特征的EMD分析

  • 凌同华,张胜,易志强,李品钰

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Energy distribution characteristics of rock acoustic emission signals with EMD analysis

  • LING Tong-hua,ZHANG Sheng,YI Zhi-qiang,LI Pin-yu
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摘要

冲击荷载作用下岩石声发射信号具有瞬态性和多样性的特点,属于典型的非平稳信号。利用EMD方法对岩石声发射信号进行分解,得到一系列具有不同特征时间尺度的IMF分量,对每一个平稳的IMF分量提取能量特征。分析结果表明:冲击荷载作用下岩石声发射信号能量主要分布在前4个IMF分量内,且分布不均匀;岩石声发射信号各IMF分量的频谱与原始信号的频谱基本一致;随着岩石的密度、纵波波速、弹性模量的降低,冲击荷载作用下岩石声发射信号的优势频率越来越集中,且其优势频率有往低频发展的趋势;相比小波包分析,EMD分析法对于非平稳信号而言更具适应性。

Abstract

The rock acoustic emission signals have transient property and diversity under impact loading, which belong to the typical non-stationary signals. The EMD method was used to decompose the rock acoustic emission signals into a number of IMF components with different characteristics time scale and then the energy characteristic of each stationary IMF component was extracted. The test results showed that the energy of the rock acoustic emission signals were mainly distributed in the first four IMF components, and unevenly distributed; The spectrum of the IMF component with the original signal spectrum were in substantial agreement; If the density of rock is less, the speed of the longitudinal wave is lower, and the elasticity modulus is less, the dominant frequency of acoustic emission signals under impact loading become more concentrated and tend to be low. Compared with wavelet packet analysis, EMD analysis was more suitable for the non-stationary signals.

关键词

SHPB试验 / 冲击荷载 / 岩石声发射信号 / 能量分布特征 / EMD分析

Key words

SHPB experiment / impact loading / rock acoustic emission signals / energy distribution characteristics / EMD analysis

引用本文

导出引用
凌同华;张胜;易志强;李品钰. 岩石声发射信号能量分布特征的EMD分析 [J]. 振动与冲击, 2012, 31(11): 26-31
LING Tong-hua;ZHANG Sheng;YI Zhi-qiang;LI Pin-yu. Energy distribution characteristics of rock acoustic emission signals with EMD analysis[J]. Journal of Vibration and Shock, 2012, 31(11): 26-31

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