具有方差和极点约束的不确定系统鲁棒H∞输出反馈控制

针对一类具有范数有界不确定性的连续系统和二次矩阵不等式区域,考虑系统具有方差和区域极点约束 的输出反馈控制器设计问题.为此首先导出闭环系统区域稳定的充分必要条件.然后用线性矩阵不等式方法给出输出反馈控制器存在的一个充分条件.在此充分条件下闭环系统是鲁棒区域稳定的且具有H-infinity性能以及当干扰为白噪声信号时其稳态状态方差有限.接下来用矩阵分解方法给出输出反馈控制器增益矩阵的求解过程.最后通过一个仿真实例说明本文所提出的控制器设计方法的有效性.     

一类不确定随机系统的鲁棒H∞约束方差控制*

本文根据Ｈ∞优化设计理论及稳态状态协方差配置的系统综合方法,利用一个修正的Ｒｉｃｃａｔｉ方程,对一类具有参数扰动的不确定线性随机系统讨论了鲁棒状态反馈控制器设计,使得闭环系统不但鲁棒稳定并具有指定的稳定裕度;而且系统性能也是鲁棒的,闭环系统同时满足给定的Ｈ∞性能指标及状态方差上限约束。     

连续时变不确定系统约束方差/H∞鲁棒状态滤波*

基于上限方差配置的混合方差／Ｈ∞设计方法可得到满足的设计结果。本文用一个修正的Ｒｉｃｃａｔｉ方程研究了一类时变不确定系统的混合方差／Ｈ∞状态滤波器,导出了滤波器的一般公式,对所允许的扰动由该公式所确定的滤波器可使稳态滤波误差方差上限及误差系统的Ｈ∞指标均小于指定值,因而具有较好的鲁棒性。     

鲁棒极点约束的H∞设计

讨论在H∞混合灵敏度问题中加极点约束以避免零极点对消的设计问题,给出了乘性不确定性下的鲁棒极点约束的LMI。讨论了极点约束问题中性能权函数的处理方法。给出了H∞控制挠性系统的设计算例。     

具有区域极点和方差约束的Delta 算子系统鲁棒H ∞滤波

研究Delta算子不确定系统在误差方差约束和区域极点约束下的鲁棒H∞滤波问题,针对多目标H∞滤波问题,采用代数矩阵不等式方法,提出滤波器的存在条件和显式表达式．所得结果可将连续系统和离散系统的有关结果统一到Delta算子框架。     

连续时变不确定系统约束方差/H∞鲁棒状态滤波*

基于上限方差配置的混合方差／H∞设计方法可得到满意的设计结果.本文用一个修正的Riccati方程研究了一类时变不确定系统的混合方差／H∞状态滤波器,导出了滤波器的一般公式．对所允许的扰动由该公式所确定的滤波器可使稳态滤波误差方差上限及误差系统的H∞指标均小于指定值,因而具有较好的鲁棒性．     

具有闭环区域极点和方差约束的鲁棒输出反馈控制

1引言 自方差控制提出以来,巳得到了广泛的研究,取得了一系列的研究成果[1～2].文献[2]研究了一类不确定连续系统具有闭环区域极点和方差约束的鲁棒控制问题,提出了鲁椴状态反馈控制器的设计方法.     

不确定中立型时滞系统的鲁棒H∞滤波

研究一类鲁棒H∞滤波问题。针对带有不确定性参数和白噪声干扰的中立型时滞系统,设计一类滤波器,使之对于任意容许的不确定性,滤波误差系统一致渐近稳定且使噪声对估计误差的影响降至给定约束范围之内。利用线性矩阵不等式的方法．将所得的确定性系统的鲁棒滤波结论,扩展到不确定性系统,得到不确定性系统鲁棒H∞滤波器的充分条件。给出的数值算例验证了所提出算法的有效性。     

不确定线性系统混合H2/H∞鲁棒输出反馈控制

解决了在系统状态空间模型的状态与输出矩阵中含有范数有界 参数不确定线性系统的混合Ｈ２／Ｈ∞鲁棒输出反馈控制问题,所推导的满阶控制器对于所有呆容许的参数不确定都能满足给定的Ｈ∞干扰衰减水平,且为最坏情形Ｈ２代价函数提供了一个最优的上界,所得的结果需要求解一个含有尺度参数的修正代数Ｒｉｃｃａｔｉ方程以及三个含有尺度参数的交叉耦合非线性方程,而且也给出了一个求解这些含有尺度参数非线性方程的数值算法。     

不确定线性系统的输出反馈鲁棒H∞控制

研究了具有范数有界参数不确定线性系统的输出反馈鲁棒Ｈ∞控制问题，给出了该系统带Ｈ∞指标γ鲁棒稳定的充要条件，以及该系统静态输出反馈带Ｈ∞指标γ鲁棒镇定的充要条件，并且指出，系统的动态输出反馈鲁棒Ｈ∞镇定问题可等价为广义系统的静态输出反馈鲁棒Ｈ∞镇定问题，所给出的方法，其设计过程只需解一个特殊的Ｒｉｃｃａｔｉ方程最后通过实例论证了方法的有效性。     

Robust H-infinity reliable control for a class of nonlinear uncertain neutral delay systems

This paper focuses on the robust H-infinity reliable control for a class of nonlinear neutral delay systems with uncertainties and actuator failures. We design a state feedback controller in terms of linear matrix inequality(LMI) such that the plant satisfies robust H-infinity performance for all adnfissible uncertainties, and actuator failures among a prespecified subset of actuators. An example is also given to illustrate the effectiveness of the proposed approach.     

Robust MPC for polytopic uncertain systems with time-varying delays

This paper addresses robust model predictive control (MPC) for time-delay systems with polytopic uncertainty. Uncertain time-varying input delay and state delays are considered, and the infinite horizon control moves are parametrised into an augmented state feedback law at each time instant. A receding horizon implementation of this state feedback law renders satisfaction of input/state constraints and closed-loop stability. For time-invariant delays and known delays, simplified results are obtained. A numerical example and a benchmark problem on continuous stirred tank reactor (CSTR) are given to illustrate the effectiveness of the proposed techniques.     

Robust stability analysis for uncertain delay systems with output feedback controller

A systematic approach is given in this paper for analyzing the robust stability of uncertain time-delay systems controlled by output feedback. By checking the eigenvalues of a Hamiltonian matrix, the stability of nominal systems can be examined first. Then, for the nominally stable uncertain systems with multiple time delays, a new method using structured singular value technique is proposed for finding a set of uncertain parameters within which the systems remain stable. Moreover, an illustrative example is given to show the usefulness of the proposed approach.     

output feedback control for uncertain stochastic systems with time-varying delays

This paper deals with the problem of H_∞ output feedback control for uncertain stochastic systems with time-varying delays. The parameter uncertainties are assumed to be time-varying norm-bounded. The aim is the design of a full-order dynamic output feedback controller ensuring robust exponential mean-square stability and a prescribed H_∞ performance level for the resulting closed-loop system, irrespective of the uncertainties. A sufficient condition for the existence of such an output feedback controller is obtained and the expression of desired controllers is given.     

具有非线性扰动的广义系统的鲁棒H∞控制

研究具有非线性结构扰动广义系统的鲁棒H∞控制和鲁棒H∞保性能控制问题,该不确定性为时间和状态的函数.且满足Lipschitz条件.目的是分别设计系统的鲁棒H∞控制器和鲁棒H∞保性能控制器.应用线性矩阵不等式方法,分别给出了系统的鲁棒H∞控制器和鲁棒H∞保性能控制器存在的充分条件.当这些条件可解时,分别给出了鲁棒H∞控制器和鲁棒H∞保性能控制器的表达式.最后通过一个仿真算例说明了所给出方法的应用.     

Delay-dependent robust H-infinity control for discrete-time uncertain systems with time-varying state delays

1 Introduction The analysis and synthesis of dynamic control systems with time delays is a subject of great practical and theo- retical importance, and has received considerable attention for decades (see [1,2] and references therein). Stability cri- teria can be classified roughly into two categories: delay- independent and delay-dependent [3]. Delay-independent criteria contains no information on the delay size, which, as might be expected, is generally conservative, especially when the dela…     

Robust adaptive tracking control of uncertain systems with time-varying input delays

In this paper, the problem of robust adaptive tracking control of uncertain systems with time-varying input delays is studied. Under some mild assumptions, a robust adaptive controller is designed by using adaptive backstepping technique such that the system is globally stable and the system output can track a given reference signal. At the same time, a root mean square type of bound is obtained for the tracking error as a function of design parameters and thus can be adjusted. Finally, one numerical example is given to show the effectiveness of the proposed scheme.     

Robust control of linear uncertain systems with regional pole and variance constraints

This paper concerns the design problem of state feedback controllers which guarantee the closed-loop poles within a specified disc and steady-state variances to be less than a set of given upper bounds for linear systems with norm-bounded parameter uncertainties. Using the linear matrix inequality approach, the existence conditions of such controllers are derived. A parametrized representation of the desired controllers is presented in terms of the feasible solutions to a certain linear matrix inequality system. Based on this, a solution to the minimum-effect guaranteed-performance design problem is presented in the sense that the required control effort is minimized subject to performance constraints.