The sufficient conditions of delay-dependent exponential stability for switched systems and robust exponential stability for uncertain switched systems with two time-delays are presented by using average dwell time method and free-weighting matrix method.The interaction between different time-delays is considered.The sufficient conditions do not need that every subsystem is stable.The designed methods of the switching law are also given.The sufficient conditions are given in the form of linear matrix inequalities that can be solved easily.The result is proven to be valid by the simulation at last.
针对具有有界时变参数不确定性和外部干扰的非线性系统,提出了一种鲁棒H∞保性能控制设计方法.基于李雅普诺夫稳定性定理和多项式平方和(sum of squares,SOS)方法,直接对非线性模型采用非线性的控制方法,给出基于状态反馈的鲁棒H∞保性能控制器存在的充分条件,使得闭环系统对于所有可能的不确定性和外部干扰不仅能够鲁棒渐近稳定,同时还能够满足相应的二次性能指标和H∞性能指标.通过求解相应的凸优化问题,得到状态反馈控制器,使得二次型性能指标上界或H∞干扰抑制度最小.仿真结果验证了所提方法的有效性.
