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Feature Extraction Method Based on Pseudo-Wigner-Ville Distribution for Rotational Machinery in Variable Operating Conditions[J]. WANG Huaqing1, *, LI Ke2, SUN Hao2, and CHEN Peng2 1 Chemical Safety Engineering Research Center of Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China 2 Graduate School of Bioresources, Mie University, Mie 514-8507, Japan.Chinese Journal of Mechanical Engineering. 2011(04)