Stochastic resonance (SR)-like and resonance suppression (RS)-like phenomena in a time-delayed bistable system driven by additive white noise are investigated by means of stochastic simulations of the power spectrum,t...Stochastic resonance (SR)-like and resonance suppression (RS)-like phenomena in a time-delayed bistable system driven by additive white noise are investigated by means of stochastic simulations of the power spectrum,the quality factor of the power spectrum,and the mean first-passage time (MFPT) of the system.The cal culative results indicate that:(i) as the system is driven by a small periodic signal,the quality factor as a function delay time exhibits a maximal value at smaller noise intensities,i.e.,an SR-like phenomenon.With the increment in additive noise inteusity,the extremum gradually disappears and the quality factor decreases monotonously with delay time.(ii) As the additive noise intensity is smaller,the curve of the MFPT with respect to delay time displays a peak,i.e.,an RS-like phenomenon.At higher levels of noise,however,the non-monotonic behavior is lost.展开更多
基金Supported by the Yunnan Provincial Foundation of China under Grant Nos 2009CD036 and 08Z0015.
文摘Stochastic resonance (SR)-like and resonance suppression (RS)-like phenomena in a time-delayed bistable system driven by additive white noise are investigated by means of stochastic simulations of the power spectrum,the quality factor of the power spectrum,and the mean first-passage time (MFPT) of the system.The cal culative results indicate that:(i) as the system is driven by a small periodic signal,the quality factor as a function delay time exhibits a maximal value at smaller noise intensities,i.e.,an SR-like phenomenon.With the increment in additive noise inteusity,the extremum gradually disappears and the quality factor decreases monotonously with delay time.(ii) As the additive noise intensity is smaller,the curve of the MFPT with respect to delay time displays a peak,i.e.,an RS-like phenomenon.At higher levels of noise,however,the non-monotonic behavior is lost.
