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研究了周期矩形信号对时滞非对称单稳系统随机共振的影响,系统中加入的噪声均为Gauss白噪声.得到了信噪比的解析表达式,通过分析信噪比曲线发现系统存在随机共振现象.数值结果还表明乘性与加性噪声强度对信噪比的影响是不同的,在SNR-D参数平面上共振与抑制共存.在信噪比随着时滞量变化的曲线图上发现,当系统的非称性|r|取值很大或者乘性与加性噪声强度比D/α小于1时,参数平面上的随机共振现象会消失.
The effect of periodic rectangular signal on the stochastic resonance of unsteady skewed monostable system is studied. The added noise in the system is Gaussian white noise. The analytical expression of signal-to-noise ratio is obtained. By analyzing the signal-to-noise curve, The numerical results also show that the multiplicative and additive noise intensities have different effects on the signal-to-noise ratio, and resonance and suppression coexist on the SNR-D parameter plane. When the value of system asymmetry | r | is large or the multiplicative and additive noise intensity ratio D / α is less than 1, the stochastic resonance in the parameter plane will disappear.