Rolling bearing fault diagnosis based on the variational mode decomposition filtering and extreme point envelope order

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (14) : 102-107.

WU Yingjie¹，XIN Hongwei¹，WANG Jianguo¹，WANG Xiaolong²

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Abstract

To diagnose rolling bearing failures under variable speed working conditions, a method based on the variational mode decomposition (VMD) filtering and extreme envelope order was put forward. The vibration signal collected in variable speed conditions was filtered by the VMD in order to improve its signaltonoise ratio and inhibit the vibration tendency term caused by speed variation. Searching the maximum of the filtered signal and extending its endpoints, an envelope signal was gained by the process of spline fitting. The time domain envelope signal was then transformed to the angle domain by using the computed order tracking technology, and then an envelope order spectrum was obtained by FFT. The simulation and experiment tests show that the proposed method can effectively extract the modulation order from modulated signal, and the VMD filtering can make fault features more highlight, which is conducive for fault identification. The proposed method provides a reference to the rolling bearing fault diagnosis under variable speed conditions.

Key words

VMD / extrema / envelope order / order tracking / fault diagnosis

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WU Yingjie1，XIN Hongwei1，WANG Jianguo1，WANG Xiaolong2. Rolling bearing fault diagnosis based on the variational mode decomposition filtering and extreme point envelope order[J]. Journal of Vibration and Shock, 2018, 37(14): 102-107

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