噪声环境下时滞耦合网络的广义投影滞后同步

时滞和噪声在复杂网络中普遍存在，而含有耦合时滞和噪声摄动的耦合网络同步的研究工作却极其稀少. 本文针对噪声环境下具有不同节点动力学、不同拓扑结构及不同节点数目的耦合时滞网络，提出了两个网络之间的广义投影滞后同步. 首先，构建了更加贴近现实的驱动-响应网络同步的理论框架；其次，基于随机时滞微分方程LaSalle不变性原理，严格证明了在合理的控制器作用下，驱动网络和响应网络在几乎必然渐近稳定性意义下能够取得广义投影滞后同步；最后，借助于计算机仿真，通过具体的网络模型验证了理论推理的有效性. 数值模拟结果表明，驱动网络与响应网络不但能够达到广义投影滞后同步，而且同步效果不依赖于耦合时滞和比例因子的选取，同时也揭示了更新增益和耦合时滞对同步收敛速度的显著性影响. 关键词： 复杂网络 广义投影滞后同步 随机噪声 时滞

Generalized projective lag synchronization between delay-coupled networks under circumstance noise

It is well known that time delay and random noise are universal in complex networks. However, the research on the synchronization of coupled networks that are subjected to delay-coupling and noise perturbation is very rare. In this paper, for two delay-coupled complex networks with different node dynamics, different topological structures and different numbers of nodes, under circumstance noise, the generalized projective lag synchronization between two networks is proposed for the first time. First, a more realistic theoretical framework is constructed for the drive-response network synchronization. Second, according to the LaSalle-type theorem for stochastic differential delay equations, we rigorously prove that the generalized projective lag synchronization between the drive-response networks can be achieved almost surely, by introducing an appropriate controller. Furthermore, numerical simulation is employed to verify the theoretical analysis. The results indicate that the drive-response networks can indeed achieve generalized projective lag synchronization, and that the synchronization is independent of time delay and scaling factor. Moreover, the remarkable influences of the update gain and the coupling delay on synchronization speed are revealed through the numerical results.
Keywords： complex networks generalized projective lag synchronization random noise time delay