一类线性离散时间系统有限时间控制问题

讨论一类具有时变、有限能量外部扰动的线性离散时间系统的有限时间控制问题.首先研究问题可解的充分条件,并讨论了状态反馈控制器存在的条件,这些条件可归结为基于线性矩阵不等式(LMI)的可解性问题;然后给出状态反馈控制器和输出反馈控制器的具体设计;最后通过仿真验证了该方案的有效性.     

具有干扰输入的离散广义系统有限时间控制器设计

主要研究具有干扰输入的离散线性广义系统有限时间状态稳定问题,首先讨论离散广义自治系统有限时间状态有界性问题,做为推论,给出了无外部干扰离散广义系统有限时间稳定条件,这些问题可解的充分条件以线性矩阵不等式(LMI)形式给出。     

一类非线性时滞广义系统的状态反馈控制

利用线性矩阵不等式(LMI),讨论了一类非线性时滞广义系统的状态反馈控制问题.通过对非线性映射Frechet导数的逆矩阵的估计,给出了系统渐近稳定的充分条件.这一条件与时滞相关,可归结为一个线性矩阵不等式的可解性.在LMI有解的条件下,可得到系统状态反馈控制器的参数表示.数值实例表明该方法是有效的.     

一类非线性随机不确定系统有限时间H∞无穷滤波

研究一类具有时变、有界干扰的非线性随机不确定系统有限时间H∞滤波问题.首先,给出了非线性随机不确定系统有限时间H∞滤波问题的定义;其次,通过构造Lyapunov-Krasoviskii函数,并结合线性矩阵不等式（LMI）方法,给出了非线性随机不确定系统有限时间∞滤波器存在的充分条件;再次,将该问题简化为具有LMI约束的优化问题,并给出了相应的求解算法;最后,通过数值算例表明了所提出设计方法的有效性.     

一类不确定非线性时滞系统的鲁棒H∞控制

针对一类状态和状态时滞具有不确定性的时滞系统,研究了该系统基于T-S模糊模型的鲁棒H∞控制器的设计问题。采用线性矩阵不等式LMI的方法,设计一个包含状态变量导数的模糊控制器,得到了系统鲁棒镇定且满足H∞性能指标的充分条件,此充分条件等价于一类线性矩阵不等式的可解性,通过仿真说明了控制器的有效性。     

＋不确定连续系统线性二次型次优控制问题的研究

基于静态输出反馈研究了不确定连续系统线性二次型（LQ）次优控制问题,应用线性矩阵不等式（LMI）给出了问题可解的充分条件,设计出了输出反馈控制器,保证了闭环系统的稳定。最后给出了仿数值算例说明该方法的有效性。     

一类随机非线性系统的有限时间H∞控制

本文研究一类随机非线性系统的有限时间H_∞控制问题.考虑闭环系统在有限时间间隔内的瞬态性能和抗干扰能力,对伊藤型随机非线性系统进行了研究.利用Lyapunov函数和线性矩阵不等式(LMI)得到了系统满足均方有限时间有界的充分条件,进一步设计了有限时间H_∞控制器,并给出了系统满足均方有限时间有界和相应H_∞性能的充分条件.最后给出了两个例子验证了该方法的有效性和可行性.     

离散时间分段脉冲系统的有限时间稳定与滤波

利用线性矩阵不等式和松弛变量方法,研究了离散时间分段脉冲系统的有限时间稳定和滤波问题。一方面给出了滤波误差系统有限时间稳定和满足性能要求的充分条件。另一方面也给出了有限时间滤波问题可解的充分条件和滤波器的设计方法。最后通过数值算例表明了结论的可行性和有效性。     

基于LMI的不确定混沌系统的有限时间同步

针对一类带有外部干扰的非匹配不确定混沌系统的有限时间同步问题,结合线性矩阵不等式(LMI)技术与滑模变结构控制方法,以Lorenz系统和蔡氏电路为例,设计了积分切换控制器,实现此类系统的有限时间同步。在滑模面的设计上引入积分滑模面设计方法,利用Lyapunov稳定性定理,以线性矩阵不等式(LMI)的形式给出滑动模态存在的充分条件,并且设计控制器,抑制了系统状态矩阵中的非匹配不确定项及外部干扰。最后利用LMI工具箱对LMI求解得出设计参数,实验结果可以看出该方法针对不确定混沌系统的同步控制中有良好的鲁棒性及抗干扰性。     

变时滞不确定奇异系统的输出反馈H_∞控制(英文)

针对同时含有变时滞和参数不确定性的奇异系统,研究了基于静态输出反馈的鲁棒H∞控制问题。采用Lya-punov泛函方法,给出了奇异系统时滞依赖渐近稳定且具有H∞范数界γ充分条件;利用含等式约束的线性矩阵不等式(LMI)方法,给出了此类系统存在输出反馈的时滞依赖充分条件,该条件等价于严格线性矩阵不等式可解性问题,利用严格LMI的可行解,得到控制器矩阵的参数化表示。与已有结果相比,此鲁棒控制器的渐近稳定性条件宽松,克服了时滞奇异系统稳定性问题条件中的等式约束。数值算例说明了该方法的有效性。     

Finite-time event-triggered extended dissipative control for discrete time switched linear systems

This paper considers the problem of finite-time event-triggered extended dissipative control for a class of discrete time switched linear systems. The proposed system is modeled as a discrete time switched linear system with an event-triggered control scheme. Under the event-triggered transmission schemes, we give some sufficient conditions to guarantee the finite-time extended dissipative performance of the closed-loop switched system in terms of linear matrix inequalities. Furthermore, the state feedback controller gains are proposed by solving a set of linear matrix inequalities. Finally, a numerical example is given to show the effectiveness of the proposed methods.     

基于矩阵测度的非线性广义时滞系统鲁棒模糊控制

研究T-S模糊广义时滞系统的鲁棒控制问题.不同于传统的寻求公共正定矩阵的方法,基于矩阵测度给出保证系统鲁棒稳定的充分条件,并将此条件进一步转化为线性矩阵不等式.通过求解线性矩阵不等式,得到状态反馈控制器和静态输出反馈控制器.最后通过算例仿真验证了方法的有效性.     

积分二次约束线性系统的H∞控制器设计:一种LMI方法

基于动态耗散理论, 给出了具有积分二次约束线性系统稳定和具有L₂有限增益的充分条件. 导出了积分二次约束线性系统H_∞ 状态反馈和动态输出反馈降阶控制器的设计方法, 并转化为多个线性矩阵不等式, 利用LMI工具箱求解.     

Finite‐Time Stability and Stabilization of Linear Itô Stochastic Systems with State and Control‐Dependent Noise

In this paper, finite‐time stability and stabilization problems for a class of linear stochastic systems are studied. First, a new concept of finite‐time stochastic stability is defined for linear stochastic systems. Then, based on matrix inequalities, some sufficient conditions under which the stochastic systems are finite‐time stochastically stable are given. Subsequently, the finite‐time stochastic stabilization is studied and some sufficient conditions for the existence of a state feedback controller and a dynamic output feedback controller are presented by using a matrix inequality approach. An algorithm is given for solving the matrix inequalities arising from finite‐time stochastic stability (stabilization). Finally, two examples are employed to illustrate the results.     

Observer‐based controller design of discrete‐time piecewise affine systems

This paper presents a novel observer‐based controller design method for discrete‐time piecewise affine (PWA) systems. The basic idea is as follows: at first, a piecewise linear (without affine terms) state feedback controller and a PWA observer are designed separately, and then it is proved that the output feedback controller constructed by the resulting observer and state feedback controller gains can guarantee the stability of the closed‐loop system. During the controller design, the piecewise‐quadratic Lyapunov function technique is used. Moreover, the region information is taken into account to treat the affine terms, so the controller gains can be obtained by solving a set of linear matrix inequalities, which are numerically feasible with commercially available software. Three simulation examples are given finally to verify the proposed theoretical results. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society     

Stability and static output feedback stabilization for a class of nonlinear discrete-time singular switched systems

In this paper, the stability and static output feedback stabilization problems for a class of nonlinear discrete-time singular switched systems are discussed. First, based on Lyapunov theory and the implicit function theorem, linear matrix inequalities sufficient conditions are developed which guarantee that the nonlinear discrete-time singular switched systems are regular, causal, have unique solution in a neighborhood of the origin, and are uniformly asymptotically stable. Then, with these conditions, and based on singular value decomposition approach, the design method of static output feedback controllers is given. Last, numerical examples are provided to illustrate the effectiveness of the proposed methods.     

Guaranteed cost control for saturated uncertain linear systems

In this paper, we discuss the problem of guaranteed cost control for uncertain linear systems subject to actuator saturation. Based on the quadratic and non-quadratic Lyapunov functions, sufficient conditions for the robust stability and performance are derived. Moreover, all the conditions can be expressed as linear matrix inequalities （LMIs） or bilinear matrix inequalities （BMIs） in terms of the feedback gain. Thus, the static controller can be effectively synthesized via convex optimization. A numerical example illustrates the effectiveness of the method.     

Finite-time control of discrete-time linear systems

In this note, we consider the finite-time stabilization of discrete-time linear systems subject to disturbances generated by an exosystem. Finite-time stability can be used in all those applications where large values of the state should not be attained, for instance in the presence of saturations. The main result provided in the note is a sufficient condition for finite-time stabilization via state feedback. This result is then used to find some sufficient conditions for the existence of an output feedback controller guaranteeing finite-time stability. All the conditions are then reduced to feasibility problems involving linear matrix inequalities (LMIs). Some numerical examples are presented to illustrate the proposed methodology.     

一类不确定线性时滞系统的输出反馈鲁棒H∞ 控制

研究具有防射参数不确定性的线性时滞系统的鲁棒H∞输出反馈控制器设计问题,得到了一些二次矩阵不等式,证明了如果它们有解,则从它们的解可以构造全阶严格真动态输出反馈控制器,它能保证闭环系统二次稳定且具有H∞范数意义下的干扰抑制能力,进一步证明了在某些情况下,这些二次矩阵不等式可以化为线性矩阵不等式来求解。