arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.11011math.DS
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具有正耦合的Kuramoto模型的次临界分岔

Subcritical Bifurcations in the Kuramoto Model with Positive Coupling

Timothy Ferguson

摘要:

仓本模型是耦合振子网络动力学的标准模型。特别是,它被用来研究长时间的行为,如锁相,其中所有振荡器以固定的角度差在一个共同的频率旋转。已经观察到,如果振荡器的固有频率彼此足够接近,则发生锁相,如果它们不足够接近,则不会发生锁相。直觉上,自然频率彼此越接近,系统越稳定。本文研究了振子之间具有正耦合的环形网络上的仓本模型,并导出了当耦合强度增加时两个分支的锁相解发生碰撞的分岔判据。此外,我们国家的标准时,这些分支之一,由稳定的锁相解决方案。在这种情况下,随着正耦合的增加,稳定性丧失。然后,我们应用我们的标准表明,对于任何大小的环网络总是存在的选择的自然频率和耦合强度,使这种分叉发生。(We对于一个分支需要至少五个振荡器来组成稳定的锁相解决方案)。最后,我们推测一般我们的分歧是局部的亚临界分歧和全球的$S$ -曲线。(In在一个分支由锁相解组成的情况下,$S$曲线导致双稳态,即存在两个不同的稳定锁相解。最后,我们注意到我们的方法是建设性的。

英文摘要:

The Kuramoto model is a standard model for the dynamics of coupled oscillator networks. In particular, it is used to study long time behavior such as phase-locking where all oscillators rotate at a common frequency with fixed angle differences. It has been observed that phase-locking occurs if the natural frequencies of the oscillators are sufficiently close to each other, and doesn't if they aren't. Intuitively, the closer the natural frequencies are to each other the more stable the system is. In this paper, we study the Kuramoto model on ring networks with positive coupling between the oscillators and derive a criterion for a bifurcation in which two branches of phase-locked solutions collide as we increase the coupling strengths. Furthermore, we state a criterion for when one of these branches consists of stable phase-locked solutions. In this case stability is lost as the positive coupling is increased. We then apply our criteria to show that for any size of the ring network there always exists choices of the natural frequencies and coupling strengths so that this bifurcation occurs. (We require at least five oscillators for one branch to consist of stable phase-locked solutions.) Finally, we conjecture that generically our bifurcation is locally a subcritical bifurcation and globally an $S$-curve. (In the case where one branch consists of phase-locked solutions, an $S$-curve results in bistability i.e. the existence of two distinct stable phase-locked solutions.) Finally, we note that our methods are constructive.

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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