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arXiv 0804.3270nlin.CD
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时滞系统从相位到广义同步的过渡

Transition from phase to generalized synchronization in time-delay systems

D. V. Senthilkumar, M. Lakshmanan, J. Kurths

摘要:

尽管在无时滞混沌动力系统中相位同步的概念已经得到了很好的研究,但在具有高度非相位相干吸引子的时滞系统中相位同步的概念还没有实现。我们报告的识别相位同步耦合不同的分段线性和耦合Mackey-Glass时间延迟系统的高度非相位相干制度。我们发现,有一个过渡,从非同步行为的相位,然后广义同步耦合强度的函数。我们引入了一个变换来捕获非相位相干吸引子的相位,这对两个时滞系统都同样有效。由变换后的吸引子计算得到的上述耦合系统的瞬时相位满足相位和平均频率锁定条件。这些转换的特征还在于在复发为基础的指标,即广义自相关函数$P(t)$,复发概率的相关性(CPR),联合复发概率(JPR)和复发概率的相似性(SPR)。我们已经量化了不同的同步制度,在这些指标。通过耦合时滞系统的李雅普诺夫指数的典型变化,也证明了相同步的存在性。

英文摘要:

The notion of phase synchronization in time-delay systems, exhibiting highly non-phase-coherent attractors, has not been realized yet even though it has been well studied in chaotic dynamical systems without delay. We report the identification of phase synchronization in coupled nonidentical piece-wise linear and in coupled Mackey-Glass time-delay systems with highly non-phase-coherent regimes. We show that there is a transition from non-synchronized behavior to phase and then to generalized synchronization as a function of coupling strength. We have introduced a transformation to capture the phase of the non-phase coherent attractors, which works equally well for both the time-delay systems. The instantaneous phases of the above coupled systems calculated from the transformed attractors satisfy both the phase and mean frequency locking conditions. These transitions are also characterized in terms of recurrence based indices, namely generalized autocorrelation function $P(t)$, correlation of probability of recurrence (CPR), joint probability of recurrence (JPR) and similarity of probability of recurrence (SPR). We have quantified the different synchronization regimes in terms of these indices. The existence of phase synchronization is also characterized by typical transitions in the Lyapunov exponents of the coupled time-delay systems.

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