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为了研究Banach空间算子的一些几何性质,给出了β算子和弱β算子的定义;讨论了β算子和弱β算子的性质,进一步得到了算子具有β性质的充分必要条件、β算子与具有β性质的空间之间的关系,研究了β算子空间的定义及此空间的性质,得到了β算子是紧算子的判别条件,给出了自反空间一个新的特征。 相似文献
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研究了一类带有状态和输入延迟的范数有界的不确定非线性离散系统的保成本控制问题。应用Lyapunov稳定性理论和线性矩阵不等式方法,提出了状态反馈控制器存在的充分条件,同时设计的控制器能够确保系统对于所允许的不确定性是渐近稳定的且性能指标不会超过某一给定的上界,因此保成本问题解决。最后通过仿真算例,验证了所提方法的有效性。 相似文献
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为了研究Banach空间中的一些几何性质,给出一个新的几何性质kUKK,根据其定义给出了kNUC算子和kUKK算子的定义;证明了kNUC算子与kUKK算子的关系;Banach空间中的算子是kNUC的充要条件是自反且T为kUKK;讨论了kUKK算子的性质,最后研究了kUKK算子与具有kUKK性质之间的关系。 相似文献
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The robust guaranteed cost sampled-data control was studied for a class of uncertain nonlinear systems with time-varying delay.
The parameter uncertainties are time-varying norm-bounded and appear in both the state and the input control matrices. By
applying an input delay approach, the system was transformed into a continuous time-delay system. Attention was focused on
the design of a robust guaranteed cost sampled-data control law which guarantees that the closed-loop system is asymptotically
stable and the quadratic performance index is less than a certain bound for all admissible uncertainties. By applying Lyapunov
stability theory, the theorems were derived to provide sufficient conditions for the existence of robust guaranteed cost sampled-data
control law in the form of linear matrix inequalities (LMIs), especially an optimal state-feedback guaranteed cost sampled-data
control law which ensures the minimization of the guaranteed cost was given. The effectiveness of the proposed method was
illustrated by a simulation example with the asymptotically stable curves of system state under the initial condition of x(0)=[0.679 6 0]. 相似文献
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