Double impulse phenomenon extraction of outer race spalle rolling element bearings based on acoustic emission signals

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (4) : 1-6.

SUN Shoubao, GUO Yu, WU Xing

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Abstract

Spalling is a major type of fatigue failures of rolling element bearings (REB). As the double impulses phenomenon can be observed in the vibration when a rolling element is entering or exiting the spall in the outer race or the inner race of the faulty REB, the double impulses phenomenon can be also observed in the acoustic emission (AE) signals generated by the faulty REB. If the space between the double impulses can be measured accurately, the width of the spall may be estimated. It will be helpful on the evaluation of remaining useful life (RUL) of REBs. The AE signal is more sensitive to the incipient fault and better to realize interferences isolation. Then, the separate treatment is used to extract the double impulses from the AE signal in this paper. In the proposed scheme, the AE signal was separate into two parts (the entering part and the exiting part) at first. Then the autoregressive model and the minimum entropy deconvolution method were used to enhance the two parts, respectively. After that, the complex Morlet wavelet based kurtogram were utilized to extract the optimal envelope, respectively. At last, the extracted envelopes were added together for the space measurement of the two impulses. Experiment analysis indicates that, the double impulse phenomenon can be effectively extracted in the AE signals of outer race spalled rolling element bearings.

Key words

acoustic emission / rolling element bearing / outer race spalling / double impulse phenomenon / complex Morlet wavelet

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SUN Shoubao, GUO Yu, WU Xing. Double impulse phenomenon extraction of outer race spalle rolling element bearings based on acoustic emission signals[J]. Journal of Vibration and Shock, 2017, 36(4): 1-6

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