Entropy 2014, 16(1), 607-626; doi:10.3390/e16010607

Defect Detection for Wheel-Bearings with Time-Spectral Kurtosis and Entropy

1,* email, 2email and 1email
Received: 17 December 2013; in revised form: 26 December 2013 / Accepted: 3 January 2014 / Published: 17 January 2014
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.
Abstract: Wheel-bearings easily acquire defects due to their high-speed operating conditions and constant metal-metal contact, so defect detection is of great importance for railroad safety. The conventional spectral kurtosis (SK) technique provides an optimal bandwidth for envelope demodulation. However, this technique may cause false detections when processing real vibration signals for wheel-bearings, because of sparse interference impulses. In this paper, a novel defect detection method with entropy, time-spectral kurtosis (TSK) and support vector machine (SVM) is proposed. In this method, the possible outliers in the short time Fourier transform (STFT) amplitude series are first estimated and preprocessed with information entropy. Then the method extends the SK technique to the time-domain, and extracts defective frequencies from reconstructed vibration signals by TSK filtering. Finally, the multi-class SVM was applied to classify bearing defects. The effectiveness of the proposed method is illustrated using real wheel-bearing vibration signals. Experimental results show that the proposed method provides a better performance in defect frequency detection and classification than the conventional SK-based envelope demodulation.
Keywords: wheel-bearing; defective frequency; spectral kurtosis; time-spectral kurtosis; feature extraction
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MDPI and ACS Style

Chen, B.; Yan, Z.; Chen, W. Defect Detection for Wheel-Bearings with Time-Spectral Kurtosis and Entropy. Entropy 2014, 16, 607-626.

AMA Style

Chen B, Yan Z, Chen W. Defect Detection for Wheel-Bearings with Time-Spectral Kurtosis and Entropy. Entropy. 2014; 16(1):607-626.

Chicago/Turabian Style

Chen, Bin; Yan, Zhaoli; Chen, Wei. 2014. "Defect Detection for Wheel-Bearings with Time-Spectral Kurtosis and Entropy." Entropy 16, no. 1: 607-626.

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