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Entropy 2018, 20(12), 932; https://doi.org/10.3390/e20120932

Rotor Fault Diagnosis Based on Characteristic Frequency Band Energy Entropy and Support Vector Machine

Department of Mechanical Engineering, North China Electric Power University, Baoding 071000, China
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Received: 21 November 2018 / Revised: 2 December 2018 / Accepted: 5 December 2018 / Published: 5 December 2018
(This article belongs to the Special Issue Entropy-Based Fault Diagnosis)
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Abstract

Rotor is a widely used and easily defected mechanical component. Thus, it is significant to develop effective techniques for rotor fault diagnosis. Fault signature extraction and state classification of the extracted signatures are two key steps for diagnosing rotor faults. To complete the accurate recognition of rotor states, a novel evaluation index named characteristic frequency band energy entropy (CFBEE) was proposed to extract the defective features of rotors, and support vector machine (SVM) was employed to automatically identify the rotor fault types. Specifically, the raw vibration signal of rotor was first analyzed by a joint time–frequency method based on improved singular spectrum decomposition (ISSD) and Hilbert transform (HT) to derive its time–frequency spectrum (TFS), which is named ISSD-HT TFS in this paper. Then, the CFBEE of the ISSD-HT TFS was calculated as the fault feature vector. Finally, SVM was used to complete the automatic identification of rotor faults. Simulated processing results indicate that ISSD improves the end effects of singular spectrum decomposition (SSD) and is superior to empirical mode decomposition (EMD) in extracting the sub-components of rotor vibration signal. The ISSD-HT TFS can more accurately reflect the time–frequency information compared to the EMD-HT TFS. Experimental verification demonstrates that the proposed method can accurately identify rotor defect types and outperform some other methods. View Full-Text
Keywords: improved singular spectrum decomposition; characteristic frequency band energy entropy; support vector machine; rotor; fault diagnosis improved singular spectrum decomposition; characteristic frequency band energy entropy; support vector machine; rotor; fault diagnosis
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Pang, B.; Tang, G.; Zhou, C.; Tian, T. Rotor Fault Diagnosis Based on Characteristic Frequency Band Energy Entropy and Support Vector Machine. Entropy 2018, 20, 932.

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