共查询到20条相似文献,搜索用时 15 毫秒
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This paper studies the problem of designing adaptive fault-tolerant H-infinity controllers for linear timeinvariant systems with actuator saturation. The disturbance tolerance ability of the closed-loop system is measured by an optimal index. The notion of an adaptive H-infinity performance index is proposed to describe the disturbance attenuation performances of closed-loop systems. New methods for designing indirect adaptive fault-tolerant controllers via state feedback are presented for actuator fault compensations. Based on the on-line estimation of eventual faults, the adaptive fault-tolerant controller parameters are updated automatically to compensate for the fault effects on systems. The designs are developed in the framework of the linear matrix inequality (LMI) approach, which can guarantee the disturbance tolerance ability and adaptive H-infinity performances of closed-loop systems in the cases of actuator saturation and actuator failures. An example is given to illustrate the efficiency of the design method. 相似文献
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基于模糊模型的时滞不确定系统的模糊H∞鲁棒反馈控制 总被引:4,自引:0,他引:4
讨论了一类具有状态和控制时滞的不确定非线性系统的模糊H∞ 状态反馈控制问题. 采用具有时滞的不确定Takagi-Sugeno(T-S)模糊模型对非线性系统进行建模, 提出了一套基于LMI的模糊鲁棒控制器的系统设计方法, 给出了模糊H∞状态反馈控制器存在的充分条件, 以保证闭环模糊系统渐近稳定并满足从干扰输入到控制输出的H∞范数界约束. 示例仿真表明了该方法的有效性. 相似文献
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This paper deals with the problems of robust stochastic stabilization and H-infinity control for Markovian jump nonlinear singular systems with Wiener process via a fuzzy-control approach. The Takagi-Sugeno (T-S) fuzzy model is employed to represent a nonlinear singular system. The purpose of the robust stochastic stabilization problem is to design a state feedback fuzzy controller such that the closed-loop fuzzy system is robustly stochastically stable for all admissible uncertainties. In the robust H-infinity control problem, in addition to the stochastic stability requirement, a prescribed performance is required to be achieved. Linear matrix inequality (LMI) sufficient conditions are developed to solve these problems, respectively. The expressions of desired state feedback fuzzy controllers are given. Finally, a numerical simulation is given to illustrate the effectiveness of the proposed method. 相似文献
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Considering that the controller feedback gain and the observer gain are of additive norm-bounded variations, a design method of observer-based H-infinity output feedback controller for uncertain Delta operator systems is proposed in this paper. A sufficient condition of such controllers is presented in linear matrix inequality (LMI) forms. A numerical example is then given to illustrate the effectiveness of this method, that is, the obtained controller guarantees the closed-loop system asymptotically stable and the expected H-infinity performance even if the controller feedback gain and the observer gain are varied. 相似文献
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广义系统H∞可靠性控制 总被引:2,自引:2,他引:2
通过对更一般形式的执行器和传感器故障模型分析,研究了广义系统基于观测器的H∞可靠性控制器设计问题.利用带有约束的广义代数Riccati不等式(GARI),给出执行器故障情况下,广义系统H∞可靠性控制器存在的充要条件和设计方法,以及传感器故障情况下,广义系统H∞可靠性控制器存在的充分条件和设计方法.所设计的H∞可靠性控制器使得闭环广义系统容许且传递函数的H∞范数有界.同时,还将带广义约束的GARI转化成了线性矩阵不等式(LMI),进而简化了广义系统H∞可靠性控制器设计方法. 相似文献
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具有域极点配置的混合H2 /H∞ 滤波 总被引:1,自引:0,他引:1
解决了具有域极点配置的连续时不变系统的混合H2 /H∞ 滤波问题. 通过采用线性矩阵不等式 (LMI)方法描述域稳定性限制、H2 和H∞ 优化, 以建立求解这个问题的总框架. 这个问题的可解性的充分必要条件由一组LMI给出. 最后用一个数字例子来说明所给出的设计方法. 相似文献
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针对轧辊偏心问题,用线性矩阵不等式(LMI)方法设计了用于轧辊偏心补偿控制的H∞输出反馈鲁棒重复控制器,首先引入动态输出反馈来保证闭环系统的鲁棒稳定性,把重复控制器设计问题转化为H∞动态反馈控制器的设计问题,采用变量替换法将非线性矩阵不等式转化为线性矩阵不等式并对其求解进而得到控制器参数.另外在采用上述控制器保证系统鲁棒稳定性的同时,通过在重复控制器中引入一个前向系数进一步改善和提高系统的动态性能与稳态控制精度.理论证明与仿真研究表明当系统对象参数存在摄动时,这种控制器仍能有效地补偿轧辊偏心对产品质量的影响. 相似文献
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Robust H-infinity control for constrained uncertain systems and its application to active suspension
This paper presents an LMI based robust H-infinity control scheme for constrained systems with normbounded uncertainties.The uncertainties are incorporated in the evaluation of the H-infinity norm and the time-domain constraints.The robust closed-loop properties inclusive of stability,H-infinity performance and the satisfaction of the timedomain constraints are discussed.Analysis and simulation results for a 2 DOF quarter-car model show possible improvements on ride comfort,while robustly respecting safety related constraints such as good road holding,limited suspension strokes and actuator saturation. 相似文献
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讨论了线性多时滞不确定离散时间线性系统的时滞相关H_∞控制问题.首先,建立了一个基于二次型项的有限和不等式.然后,利用这一不等式,采用Lyapunov-Krasovskii泛函方法,获得了系统不仅内部稳定而且具有给定的H_∞性能的时滞相关条件,同时以LMI的形式给出了无记忆H_∞控制器的设计方法.最后,数值例子说明了本文方法的有效性. 相似文献
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