一类带有时变时滞的Lur＇e型切换系统的故障估计

研究了一类带有中立项和时变时滞信号的非线性切换系统的故障估计问题。通过设计基于观测器的切换故障估计器,将故障估计问题转化为H∞滤波问题。在任意切换信号下,通过选取合适的Lyapunov-Krasovskii泛函,推导并证明了由原系统和估计系统组成的增广系统绝对稳定,同时满足给定的H∞性能指标的时滞相关充分条件。进一步利用锥形补方法给出所设计的估计器参数矩阵的解。最后通过算例验证了所提方法的有效性。     

集值 L1 极限鞅的 Riesz 分解

假定（X,‖·‖）为可分的Banach空间, X^*为其对偶空间,X^*可分. 设(Ω,B,P)为完备的概率空间, {B_n,n≥1}为B的上升子σ-域族, 且B=∨B_n. 讨论集值L¹极限鞅的一些性质, 并利用支撑函数及实值L¹ 极限鞅的Riesz分解定理, 给出了集值L¹极限鞅可Riesz分解的一个充要条件.     

Robust H∞ control for uncertain stochastic saturating systems with time delays

The robust H∞ control problem for uncertain stochastic time-delay systems containing nonlinear actuators is considered. The uncertainties in the systems are assumed to satisfy specific match condition. The time delays exitst in state as well as control input. The new stochastic robust stabilization criterion and a sufficient condition for the existence of stochastic robust stabilizing control law are derived. The delay-independent memoryless robust H∞ controllers are constructed to stabilize the given systems in terms of a group of linear matrix inequalities. A numerical simulation example is presented to show that the proposed approach is valid.     

动态解耦和变结构鲁棒补偿的导弹再入控制

导弹在大攻角再入飞行过程中,偏航通道和滚动通道存在着的气动交连耦合.采用动态解耦控制的方法,针对动态解耦对参数不确定性敏感这一缺点,提出了采用变结构鲁棒补偿控制的方法,使由于外来干扰和参数不确定性给解耦后的系统带来的残余耦合量衰减到一个适当的水平ρ,并获得一个H∞跟踪性能指标.理论分析和仿真结果表明,设计的控制系统对解耦后残余耦合进行了有效的衰减,并使系统具有良好的鲁棒性.     

Lurie时滞系统的有记忆H_∞状态反馈控制

针对一类同时存在状态和控制输入的Lurie时滞控制系统,利用Lyapunov稳定性定理并结合时滞分割法研究了该系统的鲁棒H∞控制器的分析与设计问题,得到了该系统渐进稳定且具有H∞性能的一个LMI条件,并给出了系统的有记忆状态反馈H∞控制律的设计方法。仿真实例表明了本文方法的可行性。     

H 2/H ∞ control problems of backward stochastic systems

This paper is concerned with the mixed H2/H∞ control problem for a new class of stochastic systems with exogenous disturbance signal.The most distinguishing feature,compared with the existing literatures,is that the systems are described by linear backward stochastic differential equations（BSDEs）.The solution to this problem is obtained completely and explicitly by using an approach which is based primarily on the completion-of-squares technique.Two equivalent expressions for the H2/H∞ control are presented.Contrary to forward deterministic and stochastic cases,the solution to the backward stochastic H2/H∞ control is no longer feedback of the current state;rather,it is feedback of the entire history of the state.     

三自由度直升机奇异系统鲁棒控制

研究了三自由度直升机奇异系统的鲁棒控制。首先提出了三自由度直升机奇异系统问题,然后基于状态空间方法建立三自由度直升机的线性动力学系统模型,并详细分析了系统的鲁棒稳定性,推导并证明了奇异标称自治系统鲁棒渐进稳定的条件。提出了基于线性矩阵不等式（LMI）的鲁棒H∞状态反馈控制器设计方法。仿真及实验结果表明了该方法的有效性。     

一类复杂动态网络的鲁棒H∞同步

针对一类由Lur'e系统组成的复杂动态网络,研究其鲁棒H∞同步问题,其中每个子系统所受的干扰为一个能量有界函数.基于Lyapunov稳定性理论,给出了使网络达到同步并能满足给定的H∞性能指标的同步判据,即一组LMIs有解,且所设计的控制器的参数可由LMIs的解给出.仿真中以蔡氏振荡器组成的复杂网络为例,验证了所提方法的...     

基于非线性时滞系统与时滞相关的H_∞控制

考虑非线性时滞系统的H∞控制,并对非线性项给出了一个新假设,在其假设下利用线性矩阵不等式方法得到了与时滞相关的H∞控制,同时也得到了该类非线性时滞系统鲁棒镇定的充分条件.     

Novel l2-l∞ controller design for LPV discrete time-delay systems

One of the first attempts to derive energy-to-peak performance criteria and state-feedback controller design problem for linear parameter-varying discrete time systems with time delay is provided. Firstly, we present a parameterdependent l2-l∞ performance criterion using a parameter-dependent Lyapunov function. Upon the conditions addressed,an improved parameter-dependent l2-l∞ performance criterion is established by the introduction of a slack variable,which exhibits a kind of decoupling between Lyapunov functions and system matrices. This kind of decoupling enables us to obtain more easily tractable conditions for analysis and synthesis problems. Then, the corresponding parameter-dependent state-feedback controller design is investigated upon these performance criteria, with sufficient conditions obtained for the existence of admissible controllers in terms of parameterized linear matrix inequalities. Finally, a numerical example is provided to illustrate the feasibility and advantage of the proposed controller design procedure.