Double Impulses Extraction of Faulty Hybrid Ceramic Ball Bearing Based onEEMD

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (1) : 17-22.

KONG You-bing，GUO Yu，WU Xing

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Abstract

Fatigue spalling is the most common cause of rolling bearing failure. The acceleration signals resulting from the entry of the rolling element into the spall and exit from it show the different natures when spalling failure occur in rolling ball bearing. The entry into the fault could be described as a step response, with mainly more releative low-frequency components, while the exit from the fault could excite a broader frequency impulse response as the the ball strikes the trailing edge of the fault. The effective separation of the two events plays an important role in measuring the size of the hybrid ceramic ball bearing faults. An envelope extraction based on ensemble empirical mode decomposition (EEMD) is proposed in the paper for the double impulses extraction of faulty hybrid ceramic ball bearing. In the proposed approach, the auto-regressive(AR) model is utilized to pre-whiten the raw vibration signal of the hybrid ceramic ball bearing faults at first. Then, the pre-whitened signal is filtered using a filter based on EEMD. Lastly, the Hilbert base envelope extraction is employed to extract the double impulses. Simulation and test experiments were conducted respectively to verify the validity of the proposed method.

Key words

Envelope analysis / EEMD / Hybrid Ceramic Ball Bearing / Double Impulses / Bear Fault

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KONG You-bing，GUO Yu，WU Xing. Double Impulses Extraction of Faulty Hybrid Ceramic Ball Bearing Based onEEMD[J]. Journal of Vibration and Shock, 2016, 35(1): 17-22

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