Performance degradation status identification and assessment of rolling element bearing based on the JRD and CUSUM

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 1-5.

XIA Junzhong,L Qipeng,CHEN Chengfa,LIU Kunpeng,ZHENG Jianbo

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Abstract

Degradation feature extraction is the key of the identification and assessment of bearings’ degradation status.The JRD overcomes the shortcoming of traditionally used features that cannot accurately reflect the current status of bearing,but its stability and monotonicity are poor in the whole life period.So,the CUSUM was introduced to accurately identify and evaluate the status of bearing performance degradation.The wavelet packet transform was used to denoise the original signal,the Renyi entropy of different status of bearings was calculated,and the modified JRD value,adopted as a new bearings’ degradation feature,was calculated by comparing the similarity to the standard status.The CUSUM can enhance the sensitivity to weak changes and the monotonicity in the whole life.According to the experimental data,the recognition rate of the performance degradation of rolling bearings can reach 100% and the degradation status evaluation can be implemented by stages and in monotonicity.

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rolling element bearing / performance degradation / Jensen Renyi divergence / cumulative sum and mahalanobis distance

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XIA Junzhong,L Qipeng,CHEN Chengfa,LIU Kunpeng,ZHENG Jianbo. Performance degradation status identification and assessment of rolling element bearing based on the JRD and CUSUM[J]. Journal of Vibration and Shock, 2019, 38(2): 1-5

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