Autocorrelation Ensemble Average of Larger Amplitude Impact Transients for the Fault Diagnosis of Rolling Element Bearings

Lei Hu, Yuandong Xu, Fengshou Gu, Jing He, Niaoqing Hu and Andrew Ball
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Lei Hu: College of Traffic Engineering, Hunan University of Technology, Zhuzhou 412007, China
Yuandong Xu: School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3HD, UK
Fengshou Gu: School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3HD, UK
Jing He: College of Traffic Engineering, Hunan University of Technology, Zhuzhou 412007, China
Niaoqing Hu: Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology, Changsha 410073, China
Andrew Ball: School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3HD, UK

Energies, 2019, vol. 12, issue 24, 1-19

Abstract: Rolling element bearings are one of the critical elements in rotating machinery of energy engineering systems. A defective roller of bearing moves in and out of the load zone during each revolution of the cage. Larger amplitude impact transients (LAITs) are produced when the defective roller passes the load zone centre and the defective area strikes the inner or outer races. A series of LAIT segments with higher signal to noise ratio are separated from a continuous vibration signal according to the bearing geometry and kinematics. In order to eliminate the phase errors between different LAIT segments that can arise from rotational speed fluctuations and roller slippages, unbiased autocorrelation is introduced to align the phases of LAIT segments. The unbiased autocorrelation signals make the ensemble averaging more accurate, and hence, archive enhanced diagnostic signatures, which are denoted as LAIT-AEAs for brevity. The diagnostic method based on LAIT separation and autocorrelation ensemble average (AEA) is evaluated with the datasets captured from real bearings of two different experiment benches. The validation results of the LAIT-AEAs are compared with the squared envelope spectrums (SESs) yielded based on two state-of-the-art techniques of Fast Kurtogram and Autogram.

Keywords: rolling element bearings; fault diagnosis; autocorrelation ensemble average; larger amplitude impact transient; noise reduction; rotational speed fluctuation; roller slippage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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