Fault diagnosis method of rolling bearings based onMMSE and spectral kurtosis

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (6) : 73-77.

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Fault diagnosis method of rolling bearings based onMMSE and spectral kurtosis

ZHOU Zhi, ZHANG You-yun, ZHU Yong-sheng, YAN Yu-ping, QIAN Si-si

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Abstract

Demodulated resonance technology as a common method for fault diagnosis of rolling bearing, but have the deficiency of difficulty to choose the parameter of band-pass filter. In order to solve this problem and apply it in the occasion of low signal to noise ratio of original signal, this paper presents a method of rolling bearing fault diagnosis based on combination MMSE method and spectral kurtosis. Firstly white noise is restrained to increase signal to noise ratio, then best resonance frequency band parameters are extracted by spectral kurtosis automatically, finally the results are achieved by energy operator demodulation spectrum of band-pass filtered signal. The results of numerical simulation and an experiment data show that the proposed method is effective to diagnose the fault of rolling bearing significantly.

Key words

Spectral kurtosis / MMSE / Demodulated resonance / Rolling bearing.

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ZHOU Zhi;ZHANG You-yun;ZHU Yong-sheng;YAN Yu-ping;QIAN Si-si. Fault diagnosis method of rolling bearings based onMMSE and spectral kurtosis[J]. Journal of Vibration and Shock, 2013, 32(6): 73-77