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Article

A New Piecewise Nonlinear Asymmetry Bistable Stochastic Resonance Model for Weak Fault Extraction

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Department of Mechanical Engineering, Shanghai Polytechnic University, Shanghai 201209, China
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Author to whom correspondence should be addressed.
Academic Editors: Hongrui Cao, Jianping Xuan and Yongqiang Liu
Machines 2022, 10(5), 373; https://doi.org/10.3390/machines10050373
Received: 4 April 2022 / Revised: 10 May 2022 / Accepted: 12 May 2022 / Published: 14 May 2022
(This article belongs to the Special Issue Advances in Bearing Modeling, Fault Diagnosis, RUL Prediction)
In order to solve output saturation problems found in traditional stochastic resonance methods and to improve the diagnosis ability of weak faults, a new piecewise nonlinear asymmetric bistable stochastic resonance (PNABSR) method is proposed. This model uses a left and right potential function with an asymmetrical shape, which makes it easier to induce stochastic resonance phenomena. Based on the PNABSR model, the expression of the signal-to-noise ratio (SNR) is derived, and the changes in the SNR with different parameters in the PNABSR model are analyzed. Then, the parameters in the PNABSR model are optimized using the adaptive intelligent algorithm to enhance the diagnostic ability. The diagnosis properties of the weak fault are compared between the PNABSR model and the classical bistable stochastic resonance model (CBSR). The experimental results prove that the PNABSR model can effectively extract the weak fault characteristic frequency under a strong noise background, verifying the effectiveness of this method. View Full-Text
Keywords: stochastic resonance; SNR; piecewise nonlinear asymmetric bistable stochastic resonance; weak fault diagnosis stochastic resonance; SNR; piecewise nonlinear asymmetric bistable stochastic resonance; weak fault diagnosis
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MDPI and ACS Style

Cui, L.; Xu, W. A New Piecewise Nonlinear Asymmetry Bistable Stochastic Resonance Model for Weak Fault Extraction. Machines 2022, 10, 373. https://doi.org/10.3390/machines10050373

AMA Style

Cui L, Xu W. A New Piecewise Nonlinear Asymmetry Bistable Stochastic Resonance Model for Weak Fault Extraction. Machines. 2022; 10(5):373. https://doi.org/10.3390/machines10050373

Chicago/Turabian Style

Cui, Li, and Wuzhen Xu. 2022. "A New Piecewise Nonlinear Asymmetry Bistable Stochastic Resonance Model for Weak Fault Extraction" Machines 10, no. 5: 373. https://doi.org/10.3390/machines10050373

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