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Rolling bearing fault feature extraction method based on modulation enhanced slice MSB |
FENG Kun1, YAN Kang1, HU Minghui2, HE Ya1,2, JIANG Zhinong1,2 |
1. MOE Key Lab of Engine Health Monitoring-Control and Networking, Beijing 100029, China;
2. Beijing Municipal Key Lab of Health Monitoring and Self-healing of High-level Mechanical Equipment, Beijing 100029, China |
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Abstract Aiming at poor performance of the fast spectral kurtosis diagram and the traditional slice MSB (modulation signal bispectrum) algorithm in extracting bearing fault features under strong interference conditions, a rolling bearing fault feature extraction method based on the modulation enhanced slice MSB algorithm was proposed. Firstly, MSB algorithm was used to do calculation and obtain MSB of the original vibration signal, and the carrier spectrum was obtained by slicing and superposing main dimension slices. Secondly, based on the property of MSB highlighting modulation characteristics of rolling bearing fault signal, the slicing range was optimized using the PSO algorithm. Finally, the bispectral coherence function of the slice where fault feature was located and the modulated signal bispectrum were combined to get the modulation spectrum through the enhanced reconstruction. Thus, most of noise components were removed, and fault features were extracted directly. The results of simulation and tests showed that the proposed modulation enhanced slice MSB algorithm can realize rolling bearing fault feature extraction under conditions of long transmission path and strong noise interference; the results obtained with this algorithm are more intuitive and clearer than those obtained with the fast spectral kurtosis diagram.
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Received: 12 March 2020
Published: 15 July 2021
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