The resonance behavior in the fractional harmonic oscillator with time delay and fluctuating mass

The resonance behavior in the fractional harmonic oscillator with time delay and fluctuating mass
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具有时滞和脉动质量的分数阶谐振子的谐振行为

DOI:
10.1016/j.physa.2019.123731
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发表时间:
2020-05
期刊:
Physica A
影响因子:
--
通讯作者:
H. Eugene Stanley
H. Eugene Stanley
中科院分区:
其他
文献类型:
--
作者:
Tian Yan;Yu Tao;He Guitian;Zhong Linfeng;H. Eugene Stanley

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研究了具有时滞和质量涨落的分数阶谐振子中的随机共振。利用矩方程,我们推导出输出振幅的精确解析表达式,并发现输出振幅的波动是非单调的。通过数值模拟,我们验证了分析结果的准确性。我们发现:(1)输出振幅随周期外力频率的变化呈现单峰SR和双峰SR,共振区域和共振形式在很大程度上取决于噪声相关率和噪声强度;(2)输出振幅随噪声强度的变化呈现单峰SR,随着时滞的增加,临界驱动频率降低,输出幅度随反馈增益的变化表现出多种谐振形式,时延的增加拓宽了SR发生的区域,使谐振形式多样化。
We study stochastic resonance (SR) in a fractional harmonic oscillator with time delay and mass fluctuation. Using a moment equation, we derive the exact analytical expression of the output amplitude and find that fluctuations in the output amplitude are nonmonotonic. Using numerical simulations we verify the accuracy of the analytical result. We find (i) that the evolution of output amplitude versus the frequency of the external periodic force exhibits One-Peak SR and Two-Peaks SR, resonance region and resonance form largely depend on the noise correlation rate and noise intensity, (ii) that the evolution of output amplitude versus the noise intensity exhibits One-Peak SR and the increasing time delay lower the critical driving frequency, and (iii) that the evolution of output amplitude versus feedback gain performs diverse resonance forms, the increasing time delay widens the region for occurrence of SR and diversifies the resonance form.
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