文档介绍：Mechanism and Machine Theory 44 (2009) 784–791
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Mechanism and Machine Theory
journal homepage: ate/mechmt
Local rub-impact fault diagnosis of the rotor systems based on EMD
Junsheng Cheng a,*, Dejie Yu a, Jiashi Tang b, Yu Yang a
a The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, PR China
b College of Mechanics and Aerospace, Hunan University, Changsha 410082, PR China
article info abstract
Article history: Aiming at the characteristics of the vibration signal of a rotor system with local rub-impact
Received 29 October 2006 fault, a local rub-impact fault diagnosis method of rotor system based on EMD (empirical
Received in revised form 28 February 2008 mode position) is proposed in this paper. When the local rub-impact fault occurs in
Accepted 19 April 2008
the rotor system, the vibration signals of the rotor system will present amplitude-modu-
Available online 5 June 2008
lated feature because of the periodic rub-impact between the stator and the rotor. How-
ever, it is hard to extract the rub-impact feature for the rub-impact signal is always
submerged in the background and noise signals. By using EMD, plicated signal
Keywords:
can be posed into a finite and often small number of IMFs (intrinsic mode functions),
Rotor
Local rub-impact fault an