Fault Diagnosis of a Rotor Based on a Lifting Wavelet and Local Wave  

作　　者：WANG Feng-li GAO Hong-tao ZHAO De-you 

机构地区：[1]School of Ship Engineering, Dalian University of Technology, Dalian 116024, China [2]College of Marine Engineering, Dalian Maritime University, Dalian 116026, China

出　　处：《International Journal of Plant Engineering and Management》2010年第1期13-17,共5页国际设备工程与管理（英文版）

基　　金：supported by National Natural Science Foundation of China under Grant No. 50805014

摘　　要：Aiming at the mode mixture in local wave decomposition（LWD） caused by a noise signal, the original data is preprocessed using the lifting wavelet transformation to suppress abnormal interference of noise and improve the quality of decomposition. It is employed to analyze the vibration signal of rotor rub-impact for extracting the weak impulsive feature. The signal is decomposed into intrinsic mode functions by LWD, then the high-frequency components are analyzed by Hilbert envelop demodulation. The period of the impulse response can be achieved, and the modulate fault feature of the vibration signal of a rotor system with rub-impact fault can be extracted exactly. Analysis results show that the proposed method is accurate and efficient, and is expected to be applied in engineering practice effectively.Aiming at the mode mixture in local wave decomposition（LWD） caused by a noise signal, the original data is preprocessed using the lifting wavelet transformation to suppress abnormal interference of noise and improve the quality of decomposition. It is employed to analyze the vibration signal of rotor rub-impact for extracting the weak impulsive feature. The signal is decomposed into intrinsic mode functions by LWD, then the high-frequency components are analyzed by Hilbert envelop demodulation. The period of the impulse response can be achieved, and the modulate fault feature of the vibration signal of a rotor system with rub-impact fault can be extracted exactly. Analysis results show that the proposed method is accurate and efficient, and is expected to be applied in engineering practice effectively.

关 键 词：local wave lifting scheme fault diagnosis envelope demodulation RUB-IMPACT 

分 类 号：TH17[机械工程—机械制造及自动化] TP301.6[自动化与计算机技术—计算机系统结构]