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基于李亚普诺夫稳定性理论, 严格证明了一类超混沌系统在间歇线性单向耦合下可以实现完全同步. 线性控制器通过一个开关函数来调节来实现‘停’和‘控’. 第一类开关函数由一个等幅度矩形波来控制, 控制器的打开和关闭选取不同的间隔周期(Ta, Tb); 第二类开关函数由一个等幅度方波来控制, 方波间隔周期记为T0; 首先通过构造指数类型的李亚普诺夫论证了两类开关函数调制下两个超混沌 系统在单向线性耦合下实现同步的可行性问题. 为了定量分析控制效果, 定义了一定周期内控制器的平均能耗. 在数值计算中, 对第一类矩形波函数情形则计算了二参数空间(Ta, Tb)下响应系统的最大李亚普诺夫指数分布, 同步区域/非同步区域分布, 控制器平均能耗分布, 确认在恰当的间隔周期(Ta, Tb)和耦合强度下,两个超混沌系统可以达到完全同步. 对第二类方波函数情形则计算了耦合强度和方波间隔周期T0而参 数区域内响应系统最大条件李亚普诺夫指数分布, 给定耦合强度下选择不同间隔周期下误差函数演化和平均能耗, 研究结果表明: 在恰当的耦合强度和间隔周期T0下两个超混沌系统可以达到完全同步. 同时发现, 在恰当的耦合强度下控制器的平均能耗最小, 数值计算结果验证了理论分析的可靠性.Based on the Lyapunov stability theory, it is confirmed that complete synchronization can be realized under intermittent linear coupling. The linear controller is selected as ‘stop’ or ‘on control’ by using a switch function; while the first switch function is realized by using a rectangular wave with the same amplitude, and the controller turns on/off in the peiod Ta, Tb alternately. The second switch function is adjusted by a square wave with the same amplitude, and the interval period is marked as T0. At first, a class of exponential Lyapunov function is designed to discuss the reliability and possibility of complete synchronization induced by indirectional linear coupling when the controller is adjusted by two types of switch function. The averaged power consumption of controller within a transient period is defined to measure the cost and efficiency of this scheme. In numerical studies, for the case of first switch function (rectangular wave), the distribution of the largest conditional Lyapunov function for the response system is calculated in the two-parameter space for interval period Ta vs. Tb, the synchronization area vs. nonsynchronization area, the distribution of averaged power consumption in the parameter space Ta vs. Tb. It is also confirmed that complete synchronization can be reached at appropriate Ta, Tb, and coupling intensity. In the case of the second switch function, the distribution of the largest conditional Lyapunov function for the response system is calculated in the two-parameter space for coupling intensity k vs. interval period T0, and the series of error function and averaged power consumption. It is found that complete synchronization can be realized at appropriate coupling intensity and interval period T0. It is also found that the averaged power consumption of controller within a transient period can reach a smallest value at an appropriate coupling intensity. Numerical results are consistent with the theoretical analysis.
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