基于EMD的高压燃气管道泄漏信号欠定盲分离方法

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (18) : 81-86.

论文

基于EMD的高压燃气管道泄漏信号欠定盲分离方法

孙洁娣1，郝雅立1,温江涛2, 李香文３

作者信息 +

Underdetermined blind source separation method of pipeline leakage signals based on empirical mode decomposition

SUN Jie-di1, HAO Ya-Li1, WEN Jiang-tao2，ＬＩＸｉａｎｇ-ｗｅｎ3

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摘要

为能将城市高压燃气管道泄漏产生的应力波信号中混有多种干扰振动及噪声的有效泄漏信号与多源混合振动信号分离，提出基于EMD的泄漏信号欠定盲分离方法。对传感器采集的混合信号进行经验模态分解；对各固有模态函数归一化峭度特征进行分析，选取含主要泄漏信息的固有模态函数进行重构；构造由重构信号及观测信号组成的矩阵，用扩展联合对角化算法实现信号分离，以解决欠定情况下的盲分离问题。实验结果表明该方法能较好实现有效泄漏信号的提取。

Abstract

It is usually mixed with a variety of interference vibrations and noise in the high-pressure gas pipeline leakage stress wave signals. In order to extract the effective leakage signal from the mixed signals, it proposes an underdetermined blind source separation method based on EMD. Firstly, the mixed signals collected from several sensors are decomposed by EMD. The decomposed intrinsic mode functions (IMFs) are analyzed and acquired the normalized kurtosis features. Then select the principal IMFs which containing most of the leakage information to analyze and reconstruct. The reconstructed signal and the original observation signals compose of a new observation signal matrix, from which separate the effective leakage signal. This proposed method solves the underdetermined blind sources separation. The experimental results show that it can extract leakage signal effectively.

导出引用

孙洁娣;郝雅立;温江涛;李香文. 基于EMD的高压燃气管道泄漏信号欠定盲分离方法[J]. 振动与冲击, 2013, 32(18): 81-86

SUN Jie-di;HAO Ya-Li;WEN Jiang-tao;ＬＩＸｉａｎｇ-ｗｅｎ. Underdetermined blind source separation method of pipeline leakage signals based on empirical mode decomposition[J]. Journal of Vibration and Shock, 2013, 32(18): 81-86