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Fault localization for rolling bearing based on AE |
LIU Xiaoqin, TANG Linjiang, HOU Kaize, WU Xing, WANG Zhihai |
Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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Abstract The fault characteristic frequencies of low-speed rolling element bearing is low, and is greatly affected by the speed variation. It is difficult to identify the fault in those bearings by spectrum analysis. In this paper, a fault localization method for bearing damage based on the time difference of arrival (TDOA) of acoustic emission is proposed, which does not rely on the speed of acoustic emission signal. The optimal time difference can be obtained by minimize the variation of TDOA on each band of wavelet package decomposition. The pencil-lead break experiments on the ring of the bearing show that high localization accuracy can be achieved. The experiments carried out on the bearing test bench also demonstrates that the damage locations can be found with minor errors. This localization method does not depend on the rotating speed and frequency analysis, which has great advantage for the fault diagnosis and location of variable speed and large bearings.
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Received: 25 January 2019
Published: 28 July 2020
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