Early fault detection index of rolling bearing based on integrated envelope spectrum

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 67-73.

YANG Xinmin，GUO Yu，TIAN Tian，ZHU Yungui

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Abstract

Aiming at the problem that conventional statistical index is not sensitive to the early fault of bearing, an early fault detection indicator (Integrated Envelope Spectrum Peak Factor, IESPF)of rolling bearings is proposed based on integrated envelope spectrum (IES), which is applied to bearing degradation assessment. Firstly, the signal is calculated by the algorithm of fast spectral coherence (Fast-SCoh). Then the frequency band with rich fault information was determined according to the mapping relationship between cycle frequency and carrier frequency, and integrate the frequency band to obtain the integrated envelope spectrum (IES) for bearing fault detection. Finally, the ratio of the maximum value in IES to the root mean square value of IES is calculated to obtain the IESPF proposed in this paper, and the degree of bearing fault is evaluated according to its value. The analysis of the experimental data and fatigue test data of artificial rolling bearing faults shows that the indexes proposed in this paper are sensitive to early faults and are suitable for early fault detection.

Key words

rolling element bearing / fast spectral coherence / integrated envelope spectrum；integrated envelope spectrum peak factor / early fault detection

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YANG Xinmin，GUO Yu，TIAN Tian，ZHU Yungui. Early fault detection index of rolling bearing based on integrated envelope spectrum[J]. Journal of Vibration and Shock, 2023, 42(10): 67-73

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