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Parameter-varying Systems (parameter-varying + system)
Selected AbstractsDisturbance attenuation by output feedback for linear systems subject to actuator saturationINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 2 2009Fen Wu Abstract In this paper, we study the problem of disturbance attenuation by output feedback for linear systems subject to actuator saturation. A nonlinear output feedback, expressed in the form of a quasi-linear parameter-varying system with state-dependent scheduling parameter, is constructed that leads to the attenuation of the effect of the disturbance on the output of the system. The level of disturbance attenuation is measured in terms of the restricted ,2 gain and the restricted ,2,,, gain over a class of bounded disturbances. Copyright © 2008 John Wiley & Sons, Ltd. [source] Integrated fault detection and control for LPV systemsINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 3 2009Heng Wang Abstract This paper studies the integrated fault detection and control problem for linear parameter-varying systems. A parameter-dependent detector/controller is designed to generate two signals: residual and control signals that are used to detect faults and simultaneously meet some control objectives. The low-frequency faults and certain finite-frequency disturbances are considered. With the aid of the newly developed linearization techniques, the design methods are presented in terms of solutions to a set of linear matrix inequalities. A numerical example is given to illustrate the effectiveness of the proposed methods. Copyright © 2008 John Wiley & Sons, Ltd. [source] Delay-dependent H, control of parameter-varying delayed systems via parameter-dependent Lyapunov function approach,ASIAN JOURNAL OF CONTROL, Issue 2 2009Shaosheng Zhou Abstract The H, control problem of parameter-varying delayed systems is investigated in this paper. The state-space matrices of the systems are assumed to be dependent on a vector of time-varying real parameters which are assumed to be real-time measurable. The delays related to the parameter-varying systems are assumed to be unknown but with known upper bounds and to be in the states and control inputs. A delay-dependent H, performance condition of the system under consideration is derived by using a new parameter-dependent Lyapunov function. Based on the H, performance condition, a linear matrix inequality (LMI) based H, control strategy is proposed by using auxiliary variable technique. The combined parameter-dependent and delay-dependent results are less conservative due to the generality of the parameter-dependent and delay-dependent Lyapunov function used, which includes the parameter-independent one as a special case. It is shown that the underling H, control problem can be solved as LMI optimization problems that can be numerically computed very efficiently. A numerical example is also given to demonstrate the applicability of the proposed approach. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] Two-degree-of-freedom controller design for linear parameter-varying systemsASIAN JOURNAL OF CONTROL, Issue 1 2008Wei Xie Abstract A design strategy for linear parameter-varying (LPV) systems is considered in a two-degree-of-freedom (TDOF) control framework. First, a coprime factorization for LPV systems is introduced. Second, based on the coprime factorization, a TDOF control framework of linear timeinvariant systems is extended to that of LPV systems. Good tracking performance and good disturbance rejection are achieved by a feedforward controller and a feedback controller, respectively. Furthermore, each controller design problem can be formulated in terms of a linear matrix inequality related to the L2 gain performance. Finally, a simple design example is illustrated. Copyright © 2008 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] | ||||||||||