Application of variable step frequency weighted energy operator in bearing fault diagnosis

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (7) : 86-92.

LIU Zechao, LIN Jianhui, DING Jianming, WU Wenyi

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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.

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LIU Zechao, LIN Jianhui, DING Jianming, WU Wenyi. 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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