Application of EDRS in blind source separation of rolling element bearing vibration signal

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (20) : 106-111.

LIU Kunpeng，XIA Junzhong，BAI Yunchuan，L Qipeng，ZHENG Jianbo

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Abstract

Deterministic random separation (DRS) is a classic blind source separation method of bearing signal, but it is only fit to deal with the bearing signal in steady speed while fail at completing the signal separation under variable speed condition.Meanwhile, it has less robustness because the signal amplitude value fluctuations was not considered in DRS, a method named extended deterministic random separation (EDRS) was proposed to solve the above problems.The angular domain resampling technique was applied to transform the time-domain variable-speed signal into the steady-state signal in the angular domain to reduce the influence of the rotational speed variation; the Z-scoring model was used to normalize the steady-state signal in the angular domain to decrease the signal amplitude fluctuation.After the signal was normalized, the deterministic components were extracted and the random components of the vibration signal were obtained.Simulation analysis and bearing fault test show that blind source separation of bearing signals in variable speed can be completed by EDRS, and the fault features can be extracted effectively from the random components.

Key words

Rolling Element Bearings / Blind Source Separation / Variable Speed / Deterministic Random Separation / Extended Deterministic Random Separation

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LIU Kunpeng，XIA Junzhong，BAI Yunchuan，L Qipeng，ZHENG Jianbo. Application of EDRS in blind source separation of rolling element bearing vibration signal[J]. Journal of Vibration and Shock, 2019, 38(20): 106-111

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