共查询到20条相似文献,搜索用时 249 毫秒
1.
2.
3.
4.
针对不确定线性系统,研究了执行器失效情况下鲁棒容错H∞控制问题.基于连续增益故障模式.利用线性矩阵不等式LMI推导了系统H∞指标约束下鲁棒容错镇定的充要条件,分别给出了输出反馈和状态反馈H∞控制器的设计方法.通过引入变量代换,将求解输出反馈H∞指标约束的鲁棒容错控制器的可解条件转化为标准的LMI所获得的控制器不仅能使故障系统鲁棒定,并且能达到给定的H∞性能指标.仿真实例验证了所提出设计方法的有效性.
相似文献5.
6.
对一类线性离散系统, 研究了具有闭环圆盘极点约束的输出反馈H∞ 控制问题. 基于线性矩阵不等式处理方法, 导出了输出反馈控制器的存在条件和设计方法. 和现有方法相比, 本文的方法具有更小的保守性. 相似文献
7.
探究离散线性参数变化(LPV) 重复过程的l2-l∞ 动态输出反馈控制问题. LPV 重复过程是一类复杂的时变2D 系统. 对于整个参数变化空间, 传统方法是基于二次稳定框架设计过程的控制器, 具有较大的保守性. 这里利用参数依赖Lyapunov 函数, 设计离散LPV 重复过程的参数依赖鲁棒l2-l∞ 动态输出反馈控制器, 可确保闭环离散LPV 重复过程沿通道渐近稳定, 且具有一定的l2-l∞ 扰动抑制水平. 最后, 仿真结果验证了所提出方法的有效性.
相似文献8.
9.
10.
针对动态模型未知的信息物理系统在拒绝服务(DoS)攻击下的安全控制问题,提出无模型的H∞控制方法,其中DoS攻击具有代价约束且连续攻击次数有界.首先,利用量测数据设计丢包情形下的Smith预估器对当前状态进行预测,并给出了量测反馈H∞控制器的结构形式;其次,利用博弈论将H∞控制问题转化为二人零和博弈问题,从而给出控制器增益的设计方法;进一步,基于Q-learning方法设计模型未知下的控制器增益在线求解算法,实现系统的安全H∞控制;最后,通过雕刻机平台的仿真和实验验证所提出方法的有效性. 相似文献
11.
. Emre Kse 《Systems & Control Letters》2002,47(3)
Stability analysis of linear periodically time-varying systems via integral quadratic constraints is extended to the problem of control design. A full-state feedback controller that satisfies exponential stability and
-gain disturbance attenuation from an external disturbance to a controlled output is designed for linear systems with periodically time-dependent system matrices. The main result relies on dual forms of certain integral quadratic constraints. The solvability conditions for the problem are cast as a set of finite-dimensional linear matrix inequalities and thus, they are easily solvable. Moreover, the best possible disturbance attenuation level can be obtained as a convex problem. 相似文献
12.
This paper presents a systematic approach to the design of a nonlinear robust dynamic state feedback controller for nonlinear uncertain systems using copies of the plant nonlinearities. The technique is based on the use of integral quadratic constraints and minimax linear quadratic regulator control, and uses a structured uncertainty representation. The approach combines a linear state feedback guaranteed cost controller and copies of the plant nonlinearities to form a robust nonlinear controller with a novel control architecture. A nonlinear state feedback controller is designed for a synchronous machine using the proposed method. The design provides improved stability and transient response in the presence of uncertainty and nonlinearity in the system and also provides a guaranteed bound on the cost function. An automatic voltage regulator to track reference terminal voltage is also provided by a state feedback equivalent robust nonlinear proportional integral controller. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
13.
Ian R. Petersen 《国际强度与非线性控制杂志
》2014,24(2):247-263
》2014,24(2):247-263
This paper presents a new method to synthesize a decentralized state feedback robust H ∞ controller for a class of large‐scale linear uncertain systems satisfying integral quadratic constraints. The decentralized controller is constructed by taking only block‐diagonal elements of a nondecentralized state feedback controller and treating neglected off‐diagonal blocks as uncertainties. A solution to this controller synthesis problem is given in terms of a stabilizing solution to a parametrized algebraic Riccati equation where the parameters are obtained using a differential evolution algorithm.Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
14.
Robust dissipative control for linear systems with dissipative uncertainty and nonlinear perturbation 总被引:4,自引:0,他引:4
This paper focuses on the problem of dissipative control for linear systems which are subjected to dissipative uncertainty and matched nonlinear perturbation. Specifically, quadratic dissipative uncertainty is considered, which contains norm-bounded uncertainty, positive real uncertainty and uncertainty satisfying integral quadratic constraints (IQCs) as special cases. We develop a linear matrix inequality (LMI) approach for designing a robust nonlinear state feedback controller such that the closed-loop system is quadratic dissipative for all admissible uncertainties. Furthermore, under some condition on the dissipative uncertainty, we show that the controller also guarantees the asymptotic stability of the closed-loop system. As special cases, robust H∞ control and robust passive control problems for systems with nonlinear perturbation and norm-bounded uncertainty (respectively, generalized positive real uncertainty) are solved using the LMI approach. 相似文献
15.
16.
从全新的二次型供给率的耗散角度,研究了线性时滞系统的二次稳定性和耗散控制问题,给出了线性矩阵不等式(LMI)形式的充分条件。而且,考虑了时滞系统在状态反馈控制器和动态输出反馈控制器作用下的闭环系统的二次稳定和耗散性问题,同样给出了LMI形式的充分条件,并通过线性矩阵不等式的可行解构造出耗散状态反馈控制律和动态输出反馈控制律。 相似文献
17.
This paper considers the robust-optimal design problems of output feedback controllers for linear systems with both time-varying elemental (structured) and norm-bounded (unstructured) parameter uncertainties. Two new sufficient conditions are proposed in terms of linear-matrix-inequalities (LMIs) for ensuring that the linear output feedback systems with both time-varying elemental and norm-bounded parameter uncertainties are asymptotically stable, where the mixed quadratically-coupled parameter uncertainties are directly considered in the problem formulation. A numerical example is given to show that the presented sufficient conditions are less conservative than existing ones reported recently. Then, by integrating the hybrid Taguchi-genetic algorithm (HTGA) and the proposed LMI-based sufficient conditions, a new integrative approach is presented to find the output feedback controllers of the linear systems with both time-varying elemental and norm-bounded parameter uncertainties such that the control objective of minimizing a quadratic integral performance criterion subject to the stability robustness constraint is achieved. A design example of the robust-optimal output feedback controller for the AFTI/F-16 aircraft control system with the time-varying elemental parameter uncertainties is given to demonstrate the applicability of the proposed new integrative approach. 相似文献
18.
一类多不确定性系统鲁棒H∞控制器的LMI设计方法 总被引:3,自引:0,他引:3
对同时具有加型参数不确定性以及积分二次约束(IQC,integral quadratic constraint)
不确定性环节的一类线性系统,给出设计其鲁棒H∞状态反馈控制器和动态输出反馈降阶控制
器的设计方法.在具体推导过程中,首先基于动态耗散理论,考虑了无输入情况下系统只具不
确定性闭环环节时的鲁棒H∞稳定性问题.然后基于这一条件,针对典型的无源类和有限增益
类不确定性,推出了系统同时具有多不确定性时进行鲁棒H∞状态反馈控制器和动态输出反馈降
阶控制器设计的充分条件.所有可解条件都可化为标准的LMI(1inear matrix inequality)求解. 相似文献
19.
Motivated by a robust disturbance rejection problem, in which disturbances are described by an uncertain filter at the plant input, a convex solution is presented for the robust output feedback controller synthesis problem for a particularly structured plant. The uncertainties are characterized by an integral quadratic constraint (IQC) with general frequency‐dependent multipliers. By exploiting the structure of the generalized plant, linear matrix inequality (LMI)‐synthesis conditions are derived in order to guarantee a specified ??2‐gain or ??2‐norm performance level, provided that the IQC multipliers are described by LMI constraints. Moreover, it is shown that part of the controller variables can be eliminated. Finally, the rejection of non‐stationary sinusoidal disturbance signals is considered. In a numerical example, it is shown that specifying a bound on the rate‐of‐variation of the time‐varying frequency can improve the performance if compared with the static IQC multipliers. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
20.
Robust Control System Design for an Uncertain Nonlinear System Using Minimax LQG Design Method
下载免费PDF全文
![点击此处可从《Asian journal of control》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A systematic approach to design a nonlinear controller using minimax linear quadratic Gaussian regulator (LQG) control is proposed for a class of multi‐input multi‐output nonlinear uncertain systems. In this approach, a robust feedback linearization method and a notion of uncertain diffeomorphism are used to obtain an uncertain linearized model for the corresponding uncertain nonlinear system. A robust minimax LQG controller is then proposed for reference command tracking and stabilization of the nonlinear system in the presence of uncertain parameters. The uncertainties are assumed to satisfy a certain integral quadratic constraint condition. In this method, conventional feedback linearization is used to cancel nominal nonlinear terms and the uncertain nonlinear terms are linearized in a robust way. To demonstrate the effectiveness of the proposed approach, a minimax LQG‐based robust controller is designed for a nonlinear uncertain model of an air‐breathing hypersonic flight vehicle (AHFV) with flexibility and input coupling. Here, the problem of constructing a guaranteed cost controller which minimizes a guaranteed cost bound has been considered and the tracking of velocity and altitude is achieved under inertial and aerodynamic uncertainties. 相似文献