Degradation feature extraction method for piezoelectric ceramic of ultrasonic motor based on DCT-SV cross entropy

Hongru Li, Guoqing An, Kaiyao Song, Rui Li, Huiqin Sun
2019 Journal of Vibroengineering  
Crack on piezoelectric ceramic is the main reason leading to failure of ultrasonic motors. A novel degradation feature extraction method based on discrete cosine transform (DCT) -singular value (SV) cross entropy was proposed in this paper. In order to improve the correlation with the crack, the DCT coefficients with the property of energy aggregation, were used to extract fault information. To avoid the influence of human factors in traditional DCT de-noising method, a matrix composed of DCT
more » ... efficients was constructed, and the SV cross entropy of the matrix was taken as the degradation feature for ultrasonic motor. A numerical simulated noise was added to the measured signal to verify the anti-noise performance of the feature. Analysis of the experimental results demonstrates that the proposed DCT-SV cross entropy is feasible and effective in indicating the degradation of piezoelectric ceramic in ultrasonic motor. from 2017. Now his current research interests include fault feature extraction of piezoelectric ceramics for ultrasonic motors. Rui Li is a postgraduate in Hebei University of Science and Technology, Shijiazhuang, China from 2017. Now his current research interests include fault feature extraction of piezoelectric ceramics for ultrasonic motors. Huiqin Sun is a Professor, master tutor. Now she works at Hebei University of Science and Technology. Her current research interests include motor design and its control. Hongru Li received his Ph.D. degree in 1999 from mechanical engineering college. Now he is Professor and doctoral supervisor in mechanical engineering college. His main research interest includes equipment condition monitoring and fault prognostics.
doi:10.21595/jve.2019.20525 fatcat:m4xu26pymvfdjnyt2ahnxwdhem