基于调制随机共振的微弱信号检测研究

Weak signal detection based on the modulated stochastic resonance

在工程信号处理过程中信号常超出随机共振绝热近似或线性响应理论的小参数要求而成为大参数信号。深入探讨非线性双稳系统随机共振发生机理和条件要求,将频率调制技术与随机共振理论相结合,提出用调制随机共振的方法实现随机共振理论在工程信号检测中的应用,进行了数值仿真分析证明其有效性,并将该方法应用于轴承内圈点蚀故障的检测。

In engineering signal processing,parameters of the signal are often beyond the requirements of being small parameters in adiabatic approximation approach or linear response theory of stochastic resonance.In the paper,the mechanism and condition requirements of stochastic resonance of nonlinear bistable system were discussed.By combining the frequency modulation technique with the theory of stochastic resonance,a method based on modulated stochastic resonance was suggested to achieve weak signal detection in engineering applications.Numerical simulations prove its effectiveness.The method has been successfully used to detect the fault of pitting corrosion on bearing inner race.