基于二次EEMD的Wigner-Ville分布旋转机械故障信号分析及试验研究

郭 奇;刘卜瑜;史立波;李 波

振动与冲击 ›› 2012, Vol. 31 ›› Issue (13) : 129-133.

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PDF(2367 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (13) : 129-133.
论文

基于二次EEMD的Wigner-Ville分布旋转机械故障信号分析及试验研究

  • 郭 奇1,刘卜瑜1,史立波2,李 波1
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Experimental Study and Fault Signals Analysising of Rotating Machinery Based on Dual EEMD and Wigner-Ville

  • GUO Qi1 ,LIU Bu-yu1,SHI Li-bo2, LI bo1
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摘要

摘 要: Wigner-Ville分布(WVD)凭借优良的数学性质被广泛应用于信号处理等领域,但因其不满足可加性而引起的交叉项却影响信号分析的准确性。针对此问题提出利用二次聚合经验模态分解(Ensemble Empirical Mode Decomposition, EEMD)消除Wigner-Ville分布交叉项的方法。该方法首先用EEMD将原信号分解成为若干本征模函数(Intrinsic Mode Function,IMF),再利用EEMD对获得的IMF进行二次处理,得到一组新的IMF,然后对新得到的若干模态成分分别进行WVD计算,最后将各项结果求和得到信号的WVD分布。该方法在改善模态混叠的同时有效地消除Wigner-Ville分布交叉项,并保留Wigner-Ville分布的各种优良特性。将该方法应用于转子碰摩故障诊断,效果很好。


Abstract

Abstract Wigner-Ville distribution(WVD) is widely used in the filed of signal processing dues to all kinds of excellent mathematical characteristics. However, the cross-terms of the WVD often brings us lots of problems, because the WVD is not additive in the calculation. Aiming at this problem, cross-terms erasing method based on dual Ensemble Empirical Mode Decomposition(EEMD) is put forward in this paper. This method firstly decomposes the original signal into several Intrinsic Mode Functions(IMFs) by EEMD. Then deal with the IMFs obtained with the EEMD again and now a group of new IMFs can be gained. After calculating each of the IMFs’ WVD we can gain the WVD of original signal by adding the results together. The method presented in this paper effectively avoids the cross-terms of WVD with less mode mixing while keeps the advantages of WVD. The method is used in the signal processing of the rub fault and has gained a perfect effect.

关键词

Wigner-Ville分布 / 聚合经验模态分解 / 经验模态分解 / 交叉项 / 故障诊断 / 信号处理

Key words

Wigner-Ville distribution / Ensemble Empirical Mode Decomposition / Empirical Mode Decomposition / Cross-terms / Fault diagnosis / Signal processing

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导出引用
郭 奇;刘卜瑜;史立波;李 波. 基于二次EEMD的Wigner-Ville分布旋转机械故障信号分析及试验研究[J]. 振动与冲击, 2012, 31(13): 129-133
GUO Qi;LIU Bu-yu;SHI Li-bo;LI bo. Experimental Study and Fault Signals Analysising of Rotating Machinery Based on Dual EEMD and Wigner-Ville[J]. Journal of Vibration and Shock, 2012, 31(13): 129-133

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