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arXiv 1402.6902nlin.CD
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参数不确定性对周期性和混沌可预测性的影响

Parameter Uncertainties on the Predictability of Periodicity and Chaos

E. S. Medeiros, I. L. Caldas, M. S. Baptista

摘要:

非线性动力系统,从昆虫种群到激光和化学反应,可能会对控制参数中的小扰动表现出敏感性,导致调谐参数的可预测性不确定性,导致这些系统要么混沌要么周期性行为。通过量化这种不确定性在四个不同类别的非线性系统中,我们表明,这种敏感性是可以预期的,因为导致混沌和周期性的参数集之间的边界是分形的。此外,这种分形边界的维数被证明是大致相同的这些类的系统。使用启发式模型的方式周期性窗口出现在参数空间中,我们提供了一个解释这个分形边界的普遍性质。

英文摘要:

Nonlinear dynamical systems, ranging from insect populations to lasers and chemical reactions, might exhibit sensitivity to small perturbations in their control parameters, resulting in uncertainties on the predictability of tunning parameters that lead these systems to either a chaotic or a periodic behavior. By quantifying such uncertainties in four different classes of nonlinear systems, we show that this sensitivity is to be expected because the boundary between the sets of parameters leading to chaos and to periodicity is fractal. Moreover, the dimension of this fractal boundary was shown to be roughly the same for these classes of systems. Using an heuristic model for the way periodic windows appear in parameter spaces, we provide an explanation for the universal character of this fractal boundary.

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