study and application of acoustic emission testing in fault diagnosis of low-speed heavy-duty gears研究和应用声发射检测低速重载齿轮的故障诊断.pdf

Sensors 2011, 11, 599-611; doi:10.3390/s110100599 OPEN ACCESS sensors ISSN 1424-8220 /journal/sensors Article Study and Application of Acoustic Emission Testing in Fault Diagnosis of Low-Speed Heavy-Duty Gears Lixin Gao 1, Fenlou Zai 1, Shanbin Su 1, Huaqing Wang 2,*, Peng Chen 3 and Limei Liu 4 1 Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Chao Yang District, Beijing, 100124, China; E-Mail: lead0003@163.com (L.X.G.) 2 School of Mechanical Electrical Engineering, Beijing University of Chemical Technology, Chao Yang District, Beijing, 100029, China 3 Graduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie, 514-8507, Japan; E-Mail: chen@bio.mie-u.ac.jp 4 Tang Shan Iron Steel CO. LTD., Tangshan, Hebei, China * Author to whom correspondence should be addressed; E-Mail: wanghq_buct@; Tel.: +86-10-6444-3037; Fax: +86-10-6444-6043. Received: 21 December 2010; in revised form: 31 December 2010 / Accepted: 31 December 2010 / Published: 10 January 2011 Abstract: Most present studies on the acoustic emission signals of rotating machinery are experiment-oriented, while few of them involve on-spot applications. In this study, a method of redundant second generation wavelet transform based on the principle of interpolated subdivision was developed. With this method, subdivision was not needed during the decomposition. The lengths of approximation signals and detail signals were the same as those of