CHARACTERISTICS OF STOCHASTIC RESONANCE IN ASYMMETRIC DUFFING OSCILLATOR

被引:16
|
作者
Arathi, S. [1 ]
Rajasekar, S. [1 ]
Kurths, J. [2 ]
机构
[1] Bharathidasan Univ, Sch Phys, Tiruchirappalli 620024, Tamil Nadu, India
[2] Postdam Inst Climate Impact Res, D-14469 Potsdam, Germany
来源
关键词
Stochastic resonance; asymmetric Duffing oscillator; signal-to-noise ratio; mean residence time;
D O I
10.1142/S0218127411030064
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We study the characteristics of stochastic resonance (SR) in the Duffing oscillator with three types of asymmetries in its double-well potential. The asymmetries controlled by a parameter alpha are introduced in the potential by varying (i) the depth of the left-well alone, (ii) the location of the minimum of the left-well alone and (iii) both depth and location of the minimum of the left-well alone. The characteristics of SR in the asymmetric cases are different from the symmetric case (alpha = 1). We find that asymmetry has a strong influence on the optimum noise intensity at which signal-to-noise ratio (SNR) is maximum, mean residence time at resonance and the probability distribution of residence time in the left-and right-wells. For a range of values of alpha, alpha not equal 1, SNR is found to be relatively higher than for alpha = 1.
引用
收藏
页码:2729 / 2739
页数:11
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