Application of Improved VMD Method in Fault Diagnosis of Rotor Systems

Journal of Chinese Society of Power Engineering ›› 2016, Vol. 36 ›› Issue (6) : 448-453.

LIU Shangkun, TANG Guiji

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Abstract

To diagnose the oil film instability of rotor systems and to solve the problem of end effect occurring in variational mode decomposition (VMD), an improved VMD method was proposed based on mutual information criterion to match the waveform and to extend the endpoints, so as to judge the instability status of the oil film by analyzing the Hilbert time-frequency spectrum of each component. Results show that the proposed method has strong decomposition capability to multi-component signals and has good inhibiting ability on the end effect, which is able to diagnose the occurrence moment and subsequent development of oil whirl. When the first-order oil whip occurs in a single disc rotor, the rotation frequency and whip frequency would become prominent in the spectrum, with simultaneous occurrence of their combination frequency components. Above research results may serve as a reference for accurate diagnosis of oil film instability.

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rotor fault diagnosis / oil film instability / variational mode decomposition / end effect / time-frequency analysis

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LIU Shangkun, TANG Guiji. Application of Improved VMD Method in Fault Diagnosis of Rotor Systems. Journal of Chinese Society of Power Engineering. 2016, 36(6): 448-453

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Received	Revised	Published
2015-08-07	2015-09-09	2016-06-15
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2016-06-15

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