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1.
The robust exponential stabilization problem for uncertain systems is studied. Based on the solution for a nominal linear quadratic regulator problem with a prescribed degree of stability, the methods of constructing state feedback controllers are developed to ensure the robust stability of the closed loop system under the conditions weaker than the matching condition. Also, the cases where the matching condition is satisfied are considered in detail. Some examples are included to show the solution methods.  相似文献   

2.
The robust control problem for a class of uncertain switched fuzzy systems with delays is investigated. Firstly,the model of the switched fuzzy system is presented and the parallel distributed compensation( PDC) technology is employed to design fuzzy controllers. Then, based on the convex combination method, a sufficient condition for robust stabilization in terms of linear matrix inequalities( LMIs) is obtained and a switching law is presented.Meanwhile,the Lyapunov-Krasovskii functional is taken to deal with time varying delays. Moreover,an algorithm is applied to finding a solution for a group of convex combination coefficient. Finally,a numerical example is given to demonstrate the effectiveness of the proposed method.  相似文献   

3.
We study the problem of L2-L∞, control for a class of uncertain singular systems with time-delay and norm-bounded parameter uncer- tainties in this paper. A new delay-dependent robust stability criterion is obtained in terms of linear matrix inequalities (LMIs). Based on this criterion, a state feedback controller is designed to guarantee that the closed-loop system is regular, impulse free and stable with a prescribed L2-L∞ performance satisfied for all admissible parameter uncertainties. A simulation example is included to illustrate the effectiveness of the proposed method.  相似文献   

4.
The problem of fault-tolerant controller design for a class of polytopic uncertain systems with actuator faults is studied in this paper. The actuator faults are presented as a more general and practical continuous fault model. Based on the affine quadratic stability (AQS), the stability of the polytopic uncertain system is replaced by the stability at all corners of the polytope. For a wide range of problems including H∞ and mixed H 2 /H∞ controller design, sufficient conditions are derived to guarantee the robust stability and performance of the closed-loop system in both normal and fault cases. In the framework of the linear matrix inequality (LMI) method, an iterative algorithm is developed to reduce conservativeness of the design procedure. The effectiveness of the proposed design is shown through a flight control example.  相似文献   

5.
A robust H∞ approach to filtering for a class of uncertain linear systems with time-delayed measurement is investigated.The parameter uncertainties are described by real time-varying norm-bounded form.A methodology is developed for designing linear filters such that the filtering process remains robustly stable and the transfer function from the disturbance inputs to error state outputs meets the prescribed H∞-bound constraints.The filter can be obtained and parameterized by solving two Riccati equations based on the lemma of robust stability for control system with delay.Simulation example proves the method to be effective and feasible.  相似文献   

6.
This paper presents a sliding mode(SM) based identifier to deal with the parameter idenfification problem for a class of parameter uncertain nonlinear dynamic systems with input nonlinearity. A sliding mode controller (SMC) is used to ensure the global reaching condition of the sliding mode for the nonlinear system;an identifier is designed to identify the uncertain parameter of the nonlinear system. A numerical example is studied to show the feasibility of the SM controller and the asymptotical convergence of the identifier.  相似文献   

7.
A new general model for uncertain time-varying parameters and a new measure sensor failure model are presented, and the problems of both grading robust stabilization and reliable grading robust stabilization for such systems are studied. By the Lyapunov stability theory and matrix algebra method, some sufficient criteria for the above two control problems are established in quasi-linear matrix inequalities (Q-LMIS) forms. In view of linear matrix inequality (LMI) approach, a solving procedure for the Q-LMIS problem is proposed. The solvability of the Q-LMIS problem can be improved obviously by adding some LMI constraints to the Q-LMIS. Based on the two Q-LMIS criteria, a grading robust stable control strategy, namely, the controller with different energy is acted on the system with different uncertain parameter range, is presented. The numerical simulating results show that the grading robust stable control strategy for the robust stabilization of uncertain systems has important theoretical and practical significance.  相似文献   

8.
A parameter adaptive control approach was applied to a kind of financial chaotic systems. According to Lyapunov stability theorem, synchronization of two financial chaotic systems with different certain parameters or the same uncertain parameters were implemented through designing proper control functions and using parameters selfadaptive control principle. The sufficient synchronization conditions of the two financial systems were obtained. Under the situation of the same uncertain parameters, the synchronization system has simpler controller and better performance. Numerical simulations show the effectiveness of the method.  相似文献   

9.
The robust D-stability of a class of multilinear interval polynomials is considered. Some sufficient conditions are given to judge the robust D-stability of the uncertain systems. In short, an uncertain system is robustly D-stable if some linear matrix inequalities are solvable. Moreover, our results are applied to the robust stabilization of multilinear interval plants. Taking advantage of the uncertainty structure information, these results are computationally tractable and effective in practice.  相似文献   

10.
The numerical solution of functional differential equations with a proportional delay is considered. The stability of general linear methods for linear systems of neutral type is investigated. It is shown that a general linear method with strict stability at infinity can preserve the asymptotic stability of the underlying system if we employ an appropriate equi-stage interpolation to approximate the delay argument.  相似文献   

11.
一类不确定切换模糊系统的鲁棒控制   总被引:4,自引:0,他引:4  
针对不确定的模糊系统,提出一类不确定切换模糊系统的鲁棒控制问题.使用切换技术及Lyapunov函数方法构造出连续状态反馈控制器,使得对于所有允许的不确定性,相应的闭环系统渐近稳定,同时设计可以实现系统全局渐近稳定的切换律.模型中的每个切换系统的子系统是不确定模糊系统,取常用的平行分布补偿PDC控制器,主要条件以凸组合的形式给出,具有较强的可解性.这类混杂控制系统对参数变化具有很强的鲁棒性.计算机仿真结果表明设计方法的可行性与有效性.  相似文献   

12.
讨论了一类不确定多时滞切换混杂系统在任意切换条件下鲁棒渐近稳定的问题,提出了在给定L2增益的情况下系统能够保持鲁棒渐近稳定的充分条件,并采用线性矩阵不等式的形式进行描述.利用公共李雅普诺夫方法研究了不确定多时滞切换混杂系统的鲁棒镇定问题,设计了状态反馈控制器,保证了具有给定L2增益的切换系统在任意切换条件下的鲁棒渐近稳定性质,通过算例验证了所提出方法的有效性.定理中的条件均由线性矩阵不等式得出,易于工程实现.  相似文献   

13.
研究一类含非线性扰动的不确定中立型时滞切换系统的时滞依赖指数稳定性,时滞项为时变时滞.利用平均驻留时间方法和自由权矩阵方法,给出了切换中立时滞系统时滞依赖指数稳定的充分条件,并设计状态反馈控制器,使闭环系统在一定切换策略下指数稳定,最后通过仿真算例验证结果的正确有效性.  相似文献   

14.
对含有不确定参数的时变时滞切换广义系统的鲁棒指数容许性问题和鲁棒指数镇定问题进行了研究.通过利用自由权矩阵和平均驻留时间的方法,针对该类切换广义时滞系统,给出了其鲁棒指数容许的充分条件.在此基础上设计有记忆状态反馈控制器,利用广义系统Lyapunov稳定性理论和LMI方法,得到了使相应的闭环系统正则、无脉冲且指数稳定的充分条件.最后,通过仿真算例对该方法的有效性和可行性进行验证.  相似文献   

15.
引入了一种新的无源不等式到T-S模糊广义切换系统中,进而研究了一类子系统切换与基于观测器的控制器切换存在不同步情况的系统无源性问题.首先,运用分段李雅普诺夫函数和模型依赖平均驻留时间的方法,通过无源性过剩的子系统来弥补无源性不足的子系统,从而确保切换系统的整体无源性;然后,利用线性矩阵不等式的方法得到时滞T-S模糊广义切换系统的全局一致指数稳定和严格指数无源的充分条件,并据此设计出相应的观测器和控制器,最后给出数值算例证明该方法的有效性.  相似文献   

16.
考虑了当系统存在不确定和外界干扰的情况下,一类非线性不确定时变时滞系统的多模型切换H∞跟踪控制的设计问题。利用时滞T-S模糊模型对非线性不确定时滞系统进行建模,将输入空间划分为若干个区域,在每一区域内设计局部T-S模型和控制器,这样在模糊规则数相同的情况下由于模糊论域的变小从而提高了逼近精度;在不确定性满足增益有界的条件下,得到了该类时变时滞非线性系统满足闭环稳定和H∞跟踪控制性能的充分条件,通过求解一组线性矩阵不等式(LMI),获得模糊H∞跟踪控制律,基于Lyapunov稳定性理论,证明了在此控制律下闭环系统渐进稳定;根据所选定的变量,通过多模型切换控制,将相应的区域控制器切换为全局控制器,而其他控制器不起作用,实现对整体非线性系统的逼近与控制。  相似文献   

17.
一类不确定切换模糊系统的鲁棒可靠自适应控制   总被引:1,自引:0,他引:1  
提出了一类不确定切换模糊系统的模型并研究其鲁棒镇定问题,模型中的每个子系统均为不确定模糊系统.对于系统的外部干扰具有未知上界的情况,当执行器"严重失效"而未失效部分不能镇定原系统时,使用切换技术和多Lyapunov函数方法构造出模糊鲁棒自适应可靠控制器,使得相应的闭环系统对所有可能的不确定性和所有允许的执行器失效一致最终有界,同时设计了可以实现闭环系统一致最终有界的切换律.仿真结果表明了所设计方法的可行性与有效性.  相似文献   

18.
针对状态不可测的系统,提出了一类基于观测器的不确定切换模糊系统的鲁棒控制问题.使用切换技术及多Lyapunov函数方法构造出模糊观测器,使得对于所有允许的外部干扰,相应的闭环系统渐近稳定,同时设计了可以实现系统全局渐近稳定的切换律.计算机仿真结果表明设计方法的可行性与有效性.  相似文献   

19.
肖会敏  王春花  赵林 《河南科学》2011,29(6):631-638
研究了一类含有非匹配不确定性且具有外部干扰的随机切换系统的H∞滑模控制问题.利用线性矩阵不等式(LMI)技术和单Lyapunov函数方法,设计单H∞滑模面及切换律,确保随机切换系统的滑模运动方程的鲁棒渐近稳定性,且具有H∞扰动衰减度γ;然后给出了滑模面次可达性的定义,设计了滑模控制器以保证滑模面的次可达性.仿真算例说明...  相似文献   

20.
主要研究了一类慢变线性切换系统的稳定性,通过寻找公共Lyapunov函数给出了系统在任意切换律下指数稳定的充分条件,进一步讨论了其带有非线性扰动项的非线性切换系统在适当假设下指数稳定的充分条件.  相似文献   

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