周期外力对频率涨落的过阻尼谐振子所作的功和能量随机共振

Work done by a periodical external force on an overdamped harmonic oscillator with frequency fluctuation and energetic stochastic resonance

研究了周期外力对频率涨落的过阻尼谐振子系统作功的特点.结果揭示了瞬时功率随时间的周期变化出现不对称性.研究结果还揭示周期外力一个周期对系统所做的功随乘法噪声强度的变化出现非单调行为,系统是否出现能量随机共振与抑制并存,由乘法噪声与加法噪声之间互关联的符号决定.

Characterization of the work done by a periodic external force on an overdamped harmonic oscillator with frequency fluctuation is studied. Results indicate that the instantaneous power with periodic variations of time shows asymmetry. It is also revealed that the work done by a periodic external force on the system in one period with the variation of multiplicative noise intensity exhibits non-monotonic behavior. Whether the system shows the coexistence of energetic stochastic resonance and suppression or not is determined by the sign of the correlation coefficient between the multiplicative noise and the additive noise.