两时间尺度下非光滑广义蔡氏电路系统的簇发振荡机理

通过引入周期变化的电流源并选择适当参数, 使得周期激励频率与系统固有频率之间存在量级差距, 建立了两时间尺度即快慢耦合非光滑广义蔡氏电路模型. 基于相应的广义自治系统, 考察了其不同区域中的平衡态及其稳定性, 得到了不同分岔行为及其相应的临界条件. 同时, 利用广义Clarke导数得到的广义Jacobian矩阵, 探讨了系统轨迹穿越非光滑分界面时的各种非常规分岔模式, 进而结合广义相图, 深入分析了Fold/Fold周期簇发振荡以及Fold/Hopf周期簇 发振荡两种典型的周期簇发行为及其相应的分岔机制. 关键词： 非光滑 广义蔡氏电路 两时间尺度 分岔机制

Mechanism of bursting oscillations in non-smooth generalized Chua’s circuit with two time scales

By introducing periodically alternate current source as well as suitable values for the parameters to ensure that there exists order gap between the natural frequency and the exited frequency, a two-time scale namely, a fast-slow coupled non-smooth generalized Chua’s circuit model is established. Based on the corresponding generalized autonomous system, the stabilities of the equilibrium points in different regions are investigated, from which the critical conditions related to different types of bifurcation forms are obtained. At the same time, combining the theory of Clarke derivative, different types of non-conventional bifurcation models which may occur when the trajectory passes across the non-smooth boundaries are explored. Furthermore, with the combination of the generalized phase portraits, two typical periodic bursting phenomena namely, the Fold/Fold and Fold/Hopf periodic bursters, and their associated bifurcation mechanisms are analysed in detail.
Keywords： non-smooth generalized Chua’s circuit two time scales bifurcation mechanism