自然科学版
陕西师范大学学报(自然科学版)
数学与计算机科学
非对称三值噪声激励下一类线性系统的随机共振现象
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武娟1,许勇1*,张慧清1,王顺利2
(1西北工业大学 理学院,陕西 西安 710129; 2国家林业局管理干部学院 培训教学部,北京 102600)
武娟,女,硕士研究生,研究方向为应用概率统计及随机动力系统.E-mail:wujuan1987mm@163.com.*通信作者:许勇,男,副教授.E-mail:hsux3@nwpu.edu.cn.
摘要:
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.
关键词:
非对称三值噪声;随机共振;线性系统;输出信号振幅
收稿日期:
2011-07-10
中图分类号:
O211.62文献标志码: A
文献标识码:
A
文章编号:
1672-4291(2012)01-0009-04
基金项目:
国家自然科学基金资助项目(10972181,11102157).
Doi:
Stochastic resonance in a linear system induced by asymmetric trichotomous noise
WU Juan1, XU Yong1*, ZHANG Hui-qing1, WANG Shun-li2
(1 College of Science, Northwestern Polytechnical University, Xi′an 710129, Shaanxi, China;2 Department of Training and Teaching,State Academy of Forestry Administration,Beijing 102600,China)
Abstract:
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.
KeyWords:
asymmetric trichotomous noise; stochastic resonance; linear system; output amplitude