基于变分模式分解的行星齿轮箱齿轮组合故障频率解调分析

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Abstract Combined fault vibration signals of a planetary gearbox with features of multi-source modulation and complex sideband structure in frequency domain.It is difficult to effectively extract gear fault features with conventional Fourier spectral analysis.However, the frequency modulation part of combined fault vibration signals contains fault information and is independent on the vibration transfer path.Here, a frequency demodulation analysis method based on the variational mode decomposition was proposed to extract combined fault features of a planetary gearbox.Firstly, the single-component number was determined according to sampling frequency and carrier one.Then, a multi-component signal was adaptively decomposed into a series of intrinsic mode functions with the variational mode decomposition.Instantaneous frequency of each intrinsic mode function was calculated, and sensitive single-component was selected according to the matching relation between central frequency and meshing one.Finally, instantaneous frequency spectrum of each sensitive single-component was analyzed to diagnose combined faults.The effectiveness of the proposed method was verified through analyzing simulated vibration signals and test ones, and combined faults of sun gear-planet one, sun gear-gear ring and planet gear-gear ring were diagnosed.

Key words： variational mode decomposition (VMD) combined fault planetary gearbox frequency modulation

Received: 17 July 2018 Published: 28 January 2020

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	LI Xiao
	FENG Zhipeng

Cite this article:

LI Xiao,FENG Zhipeng. Combined fault frequency demodulation analysis for a planetary gearbox based on VMD[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 38-45.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I3/38

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