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arXiv 1105.3537nlin.CD
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具有多涡卷吸引子的修正Chua电路方程的统计测度和扩散动力学

Statistical measures and diffusion dynamics in a modified Chua's circuit equation with multi-scroll attractors

G. Sakthivel, S. Rajasekar, K. Thamilmaran, Syamal Kumar Dana

摘要:

本文研究了一种改进的蔡氏电路模型方程,用锯齿函数代替蔡氏电路的分段线性函数,使其显示多涡卷混沌吸引子。研究了混沌吸引子的第一次通过时间($n$ s)、在涡卷吸引子上的停留时间($t_\mathrm{RT}$ s)和返回到中涡卷吸引子的时间($t_\mathrm{RET}$ s)的特性. $t_\mathrm{FPT}$表现出一系列类高斯分布,然后是长尾连续分布。$t_\mathrm{RT}$和$t_\mathrm{RET}$呈完全离散分布。发现$t_\mathrm{FPT}$ s、$t_\mathrm{RT}$ s和$t_\mathrm{RET}$ s的平均值随控制参数的变化呈幂律变化,另一方面,当控制参数取一定值时,$t_\mathrm{FPT}$ s和$t_\mathrm{RET}$ s的平均值与涡卷吸引子的个数呈线性关系.对于具有无限涡卷混沌吸引子的系统,则发生正常的扩散运动。在正常扩散过程中,均方位移随时间线性增长。

英文摘要:

In this paper the focus is set on a modified Chua's circuit model equation with saw-tooth function in place of piece-wise linear function of Chua's circuit displaying multi-scroll chaotic attractors. We study the characteristic properties of first passage times ($t_\mathrm{FPT}$s) to $n$th scroll chaotic attractor, residence times ($t_\mathrm{RT}$s) on a scroll attractor and returned times ($t_\mathrm{RET}$s) to the middle-scroll attractor. $t_\mathrm{FPT}$s exhibit a series of Gaussian-like distribution followed by a long tail continuous distribution. $t_\mathrm{RT}$s and $t_\mathrm{RET}$s show completely discrete distribution. Power-law variation of mean values of $t_\mathrm{FPT}$s, $t_\mathrm{RT}$s and $t_\mathrm{RET}$s with a control parameter is found. On the other hand, mean values of $t_\mathrm{FPT}$s and $t_\mathrm{RET}$s have linear dependence with the number of the scroll attractors for fixed values of the control parameter. For the system with infinite scroll chaotic attractors normal diffusive motion occurs. In the normal diffusion process the mean square displacement grows linearly with time.

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