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| Research on the Enhanced Detection Method of Bearing Fault Weak Fault Signal Based on Nonlinear Coupled Bistable Stochastic Resonance |
| SHI Pei-ming,SUN Peng,YUAN Dan-zhen |
| School of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China |
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Abstract In order to solve the problem that the weak fault signal of rolling bearing is difficult to be detected, a new method based on a new nonlinear coupled bistable stochastic resonance model is proposed. Under the background of noise, stochastic resonance can enhance the output of weak signal and improve the detection of weak signal. The nonlinear coupled bistable system proposed in this paper is composed of two single bistable system with nonlinear coupling. The influence of different parameters on the phenomenon of stochastic resonance are researched through the analysis of the damping coefficient and the coupling coefficient, with the noise intensity change SNIR (signal to noise improvement ratio) response curve. The results show that the coupled bistable system is more robust than the single bistable system. In the end, the bearing fault of weak signal was enhanced by using this detection model, the proposed nonlinear coupled bistable stochastic resonance can detect weak fault signal noise in complex background.
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Received: 16 March 2017
Published: 12 April 2018
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Corresponding Authors:
pei-ming shi
E-mail: spm@ysu.edu.cn
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2018, Vol. 39 
