研究了一类具有外部周期信号的线性系统在乘性非对称三值噪声激励下呈现随机共振现象的情况.采用Shapiro-Loginov公式,计算出系统输出信号振幅的精确表达式.通过平面及三维图示分析,系统观察出两类广义的随机共振现象.也就是系统在某些参数下,输出信号振幅随着三值噪声强度及其非对称度的变化显现出非单调依赖性.
The phenomenon of stochastic resonance(SR) in a linear system with an external periodic signal derived by a multiplicative asymmetric trichotomous noise is investigated.The exact expression of the output amplitude is derived by the Shapiro-Loginov formula.Two kinds of SR phenomena are found through the two-dimensional and three-dimensional figures,i.e.the non-monotonic dependence of the output amplitude on the noise strength and the noise asymmetry degree is presented with some parameters.