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Energies 2017, 10(7), 972; doi:10.3390/en10070972

An Enhanced Empirical Wavelet Transform for Features Extraction from Wind Turbine Condition Monitoring Signals

1
School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China
2
School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
3
Hunan Province Cooperative Innovation Centre for Wind Power Equipment and Energy Conversion, Hunan Institute of Engineering, Xiangtan 411104, China
4
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Received: 25 May 2017 / Revised: 17 June 2017 / Accepted: 5 July 2017 / Published: 11 July 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

Feature extraction from nonlinear and non-stationary (NNS) wind turbine (WT) condition monitoring (CM) signals is challenging. Previously, much effort has been spent to develop advanced signal processing techniques for dealing with CM signals of this kind. The Empirical Wavelet Transform (EWT) is one of the achievements attributed to these efforts. The EWT takes advantage of Empirical Mode Decomposition (EMD) in dealing with NNS signals but is superior to the EMD in mode decomposition and robustness against noise. However, the conventional EWT meets difficulty in properly segmenting the frequency spectrum of the signal, especially when lacking pre-knowledge of the signal. The inappropriate segmentation of the signal spectrum will inevitably lower the accuracy of the EWT result and thus raise the difficulty of WT CM. To address this issue, an enhanced EWT is proposed in this paper by developing a feasible and efficient spectrum segmentation method. The effectiveness of the proposed method has been verified by using the bearing and gearbox CM data that are open to the public for the purpose of research. The experiment has shown that, after adopting the proposed method, it becomes much easier and more reliable to segment the frequency spectrum of the signal. Moreover, benefitting from the correct segmentation of the signal spectrum, the fault-related features of the CM signals are presented more explicitly in the time-frequency map of the enhanced EWT, despite the considerable noise contained in the signal and the shortage of pre-knowledge about the machine being investigated. View Full-Text
Keywords: wind turbine; drive train; condition monitoring; empirical wavelet transform wind turbine; drive train; condition monitoring; empirical wavelet transform
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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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Shi, P.; Yang, W.; Sheng, M.; Wang, M. An Enhanced Empirical Wavelet Transform for Features Extraction from Wind Turbine Condition Monitoring Signals. Energies 2017, 10, 972.

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