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arXiv 2005.11628math.DSnlin.AO
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同宿分岔附近周期轨道和弛豫振子的增广相位约化

Augmented Phase Reduction for Periodic Orbits Near a Homoclinic Bifurcation and for Relaxation Oscillators

Bharat Monga, Jeff Moehlis

摘要:

振子--具有稳定周期轨道的动力系统--出现在许多物理、技术和生物系统中。标准的相位缩减,一种基于等时线的模型缩减技术,可能不适用于具有小幅度负非平凡Floquet指数的振荡器。这就需要使用的增广相还原,最近设计的二维还原技术的基础上等时线和等稳线。在这篇文章中,我们计算两个动态不同的平面系统的增广相位减少的解析表达式:周期轨道诞生的同宿分岔,和弛豫振荡器。为了验证我们的计算,我们模拟模型在这些动态制度,并比较其数值计算的增广相位减少与推导出的解析表达式。这些分析和数值计算帮助我们理解在标准相位缩减上使用增广相位缩减可能是有利的条件。

英文摘要:

Oscillators - dynamical systems with stable periodic orbits - arise in many systems of physical, technological, and biological interest. The standard phase reduction, a model reduction technique based on isochrons, can be unsuitable for oscillators which have a small-magnitude negative nontrivial Floquet exponent. This necessitates the use of the augmented phase reduction, a recently devised two-dimensional reduction technique based on isochrons and isostables. In this article, we calculate analytical expressions for the augmented phase reduction for two dynamically different planar systems: periodic orbits born out of a homoclinic bifurcation, and relaxation oscillators. To validate our calculations, we simulate models in these dynamic regimes, and compare their numerically computed augmented phase reduction with the derived analytical expressions. These analytical and numerical calculations help us to understand conditions for which the use of augmented phase reduction over the standard phase reduction can be advantageous.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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