朱忠奎小波多分辨分析期刊论文.pdf

International Journal of Wavelets, Multiresolution and Information Processing Vol. 7, No. 4 (2009) 427–442 c World Scientific Publishing Company SYNCHRONOUS ENHANCEMENT OF PERIODIC TRANSIENTS ON POLAR DIAGRAM m y. FOR MACHINE FAULT DIAGNOSIS o l c n . o c i e f s i t u n l e a i c n Z. K. ZHU∗ s o d s l r r e School of Urban Rail Transportation, Soochow University o p w r . o Suzhou, Jiangsu, 215021, P. R. China w F ∗ w . zkzhu@ustc.edu w 4 1 / m 5 o 2 / r 2 ZHIYONG HE, ANZHU WANG and SHIBIN WANG f 0 d e n School of Mechanical and Electrical Engineering, Soochow University d o a o A Suzhou, Jiangsu, 215021, P. R. China l N n w I o H C D . F 2 O Received 31 October 2008 4 4- Y Revised 1 March 2009 7 G 2 O 4 : L 7 O 0 9. N A periodic transient detection and representation method, termed synchronous enhance- 0 H ment of periodic feature (SEPF), based on the Continuous Wavelet Transform (CWT) is 0 C 2 E s. T proposed. This method first represents a given signal in the time-scale domain through s e D CWT and then maps the resulted wavelet coefficients into the polar diagram using the c o N r A given potential periods. Transient features would thus be synchronously enhanced at a P f. E