A novel coupled two-dimensional unsaturated asymmetric bistable stochastic resonance system for bearing fault detection

Abstract

A novel coupled two-dimensional unsaturated asymmetric bistable stochastic resonance (NCTUABSR) method is proposed in this paper, which is formed by coupling a new asymmetric bistable controlled system with a monostable control system, and significantly solves the serious output saturation problem of traditional two-dimensional bistable system. Based on the SPD and MFPT, it is found that with the increase of coupling, the depth and distance of double potential wells in two-dimensional space will decrease, which makes the particles more prone to inter-well transition. Combined with SNR, the performance characteristics of NCTUABSR under the influence of different parameters are deeply analyzed. NCTUABSR is applied to different types of bearings for fault signal detection, and adaptive genetic algorithm is used to optimize the parameters. Compared with different coupling systems, it is found that the detection performance of NCTUABSR has the most advantages, indicating that the system has obvious feasibility in practical engineering applications.