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Appl. Sci. 2017, 7(2), 128; doi:10.3390/app7020128

Wind Turbine Gearbox Fault Diagnosis Based on Improved EEMD and Hilbert Square Demodulation

Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Academic Editor: Gangbing Song
Received: 2 November 2016 / Revised: 31 December 2016 / Accepted: 6 January 2017 / Published: 26 January 2017
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Abstract

The rapid expansion of wind farms has accelerated research into improving the reliability of wind turbines to reduce operational and maintenance costs. A critical component in wind turbine drive-trains is the gearbox, which is prone to different types of failures due to long-term operation under tough environments, variable speeds and alternating loads. To detect gearbox fault early, a method is proposed for an effective fault diagnosis by using improved ensemble empirical mode decomposition (EEMD) and Hilbert square demodulation (HSD). The method was verified numerically by implementing the scheme on the vibration signals measured from bearing and gear test rigs. In the implementation process, the following steps were identified as being important: (1) in order to increase the accuracy of EEMD, a criterion of selecting the proper resampling frequency for raw vibration signals was developed; (2) to select the fault related intrinsic mode function (IMF) that had the biggest kurtosis index value, the resampled signal was decomposed into a series of IMFs; (3) the selected IMF was demodulated by means of HSD, and fault feature information could finally be obtained. The experimental results demonstrate the merit of the proposed method in gearbox fault diagnosis. View Full-Text
Keywords: wind turbine gearbox; fault diagnosis; EEMD; Hilbert square demodulation wind turbine gearbox; fault diagnosis; EEMD; Hilbert square demodulation
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Chen, H.; Chen, P.; Chen, W.; Wu, C.; Li, J.; Wu, J. Wind Turbine Gearbox Fault Diagnosis Based on Improved EEMD and Hilbert Square Demodulation. Appl. Sci. 2017, 7, 128.

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