Design of Non-fragile Satisfactory Estimator for Linear Continuous Perturbed Stochastic Systems

The design problem of non-fragile estimator is addressed for a class of perturbed linear continuous systems. The perturbations occur on the plant and estimator parameters. The estimator designed should force the error system to achieve the desired decay rate and force the steady error variance less than the specified upper bound irrelevancy of the admissible plant perturbations and estimator perturbations. Consistency problem of the decay rate with the variance upper bound is first considered via linear matrix inequality (LMI) approach. The solution of the estimator parameter under specifications to be consistent is then discussed. The consistency condition of specifications and estimator parameter solution are transformed to feasible or minimum problems subject to a set of LMI respectively. The method is illustrated by a numerical example.

不确定奇异周期系统的鲁棒容错H_∞控制

针对一类具有外部扰动输入的不确定奇异周期系统,研究了该类系统的鲁棒容错H∞控制的问题,其中不确定性存在于系统的状态矩阵和输入矩阵当中,且满足范数有界条件。利用线性矩阵不等式(LMI)和李雅普诺夫不等式的分析方法提出了不确定奇异周期系统的鲁棒二次稳定和鲁棒二次可镇定且具有H∞性能指标的概念,得到了该类系统鲁棒容错H∞控制的充分和必要条件,并给出了系统状态反馈鲁棒容错H∞控制器的设计方法,所设计的H∞控制器既保证了闭环系统对故障发生时的鲁棒性,又能保证系统满足一定的H∞性能γ。研究成果是不确定奇异定常系统鲁棒容错H∞控制结论向不确定奇异周期系统的推广,因而具有较大的理论意义。最后,文章给出的数值算例证明了结论的有效性。

一类线性广义切换系统的H∞状态反馈控制

研究了一类不确定切换广义系统的H∞状态反馈控制问题，以线性矩阵不等式（LMI）的形式给出了该类系统的鲁棒稳定且具有H∞扰动衰减度γ充分条件和控制器以及切换策略。将正常系统的Lyapunov函数研究方法推广到切换广义系统。