变步长频率加权能量算子在轴承故障诊断中的应用

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Abstract Envelope demodulation can be used to extract periodic components in modulated signals to realize early diagnosis and warning of bearing faults,but the envelope demodulation requires that the signals to be demodulated must be Am-FM signals,and the demodulation effect is easily affected by other interference signals. The frequency weighted energy operator is more robust than the envelope demodulation. However,the frequency weighted energy operator used to demodulate modulated signals with lower central frequency is less robust when the middle point average difference method was applied in discretization. Here,the variable step frequency weighted energy operator (VFWEO) was proposed to enhance its robustness at lower central frequency by changing step parameters. Analysis and test verification showed that VFWEO has a better demodulation effect within the entire frequency band; VFWEO can be used to realize demodulation of different resonant frequency bands without decomposing signals,so it is more valuable in engineering application.

Key words： Rolling bearing fault diagnosis Frequency-weighted energy operator Vary step difference.

Received: 26 April 2018 Published: 28 March 2019

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	Articles by authors
	LIU Zechao
	LIN Jianhui
	DING Jianming
	WU Wenyi

Cite this article:

LIU Zechao,LIN Jianhui,DING Jianming, et al. Application of variable step frequency weighted energy operator in bearing fault diagnosis[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(7): 86-92.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I7/86

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