Improved LMD algorithm based on extraction of extrema of envelope curve

Yuqian Song; Jun Zhao; Tiantai Guo; Ming Kong; Yingjun Wang; Liang Shan

doi:10.1117/12.2181138

6 March 2015 Improved LMD algorithm based on extraction of extrema of envelope curve

Yuqian Song, Jun Zhao, Tiantai Guo, Ming Kong, Yingjun Wang, Liang Shan

Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94462F (2015) https://doi.org/10.1117/12.2181138
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China

Abstract

Local mean decomposition (LMD) is a time-frequency analysis approach to deal with complex multi-frequency signal. However, as the decomposition process is sensitive to noise, there is a distinct limit when it is applied to analysis of the vibration signals of machinery with serious background noise. An improved LMD algorithm based on extracting the extrema of envelope curve is put forward to reduce the influence of high-frequency noise effectively. To verify its effect, three different de-noising methods, i.e., band-pass filter method, wavelet method and lift wavelet method are used, respectively. And the comparison result of the 4 methods shows that the proposed method has satisfactory reproducibility. Then the new algorithm is applied to real bearing signal, and experimental results show that it is effective and reliable. The method also has certain significance for the subsequent eigenvector research in intelligent fault diagnosis.

Citation Download Citation

Yuqian Song, Jun Zhao, Tiantai Guo, Ming Kong, Yingjun Wang, and Liang Shan "Improved LMD algorithm based on extraction of extrema of envelope curve ", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94462F (6 March 2015); https://doi.org/10.1117/12.2181138

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