Application of First-order linear system’s Stochastic ResonanceIn Fault Diagnosis of Rotor Shaft
Leng Yong-gang1,2, Tian Xiang-you1
1.School of Mechanical Engineering, Tianjin University, Tianjin 300072, China2.Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin300072, China
Abstract：The extraction method of a signal’s frequency based on the parameter- adjusted stochastic resonance (SR) of first-order linear system in a broad sense is presented in this paper, which is aimed at recognizing the weak fault signal in early stage. This method makes use of the phenomenon that the output signal-to-noise ratio (SNR) will get a resonance peak by tuning the system’s parameter. To make characteristic signal more distinct, the paper explains how to choose the parameters among the system parameter, signal frequency and sampling rate targeted at the best signal recognition. Then the simulated rotor shaft’s early weak fault from test-bed of sliding bearing confirms the effectiveness of this method.
2014, Vol. 33 
