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Entropy 2016, 18(8), 292; doi:10.3390/e18080292

On Multi-Scale Entropy Analysis of Order-Tracking Measurement for Bearing Fault Diagnosis under Variable Speed

1
Department of Mechanical Engineering, National Chung Hsing University, Taichung 402, Taiwan
2
Kuozui Motors, Ltd., Taoyuan 320, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: J. A. Tenreiro Machado
Received: 20 June 2016 / Revised: 2 August 2016 / Accepted: 8 August 2016 / Published: 10 August 2016
(This article belongs to the Section Complexity)
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Abstract

The research objective in this paper is to investigate the feasibility and effectiveness of utilizing envelope extraction combining the multi-scale entropy (MSE) analysis for identifying different roller bearing faults. The features were extracted from the angle-domain vibration signals that were measured through the hardware-implemented order-tracking technique, so that the characteristics of bearing defects are not affected by the rotating speed. The envelope analysis was employed to the vibration measurements as well as the selected intrinsic mode function (IMF) that was separated by the empirical mode decomposition (EMD) method. By using the coarse-grain process, the entropy of the envelope signals in the different scales was calculated to form the MSE distributions that represent the complexity of the signals. The decision tree was used to distinguish the entropy-related features which reveal the different classes of bearing faults. View Full-Text
Keywords: multi-scale entropy; bearing fault; order tracking; empirical mode decomposition; decision tree; variable speed multi-scale entropy; bearing fault; order tracking; empirical mode decomposition; decision tree; variable speed
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wu, T.-Y.; Yu, C.-L.; Liu, D.-C. On Multi-Scale Entropy Analysis of Order-Tracking Measurement for Bearing Fault Diagnosis under Variable Speed. Entropy 2016, 18, 292.

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