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The design of Proportional-Integral Observer (PIO) for time-delay systems is considered in this paper. First, a method for PIO design is proposed to attenuate the disturbance to a pre-specified level while estimating the state of the delay system. The method guarantees the stability of the observer and minimizes the Hinfin norm between the disturbance and the estimated error. An alternative design...
This paper is concerned with the robust Hinfin filtering problem for a class of uncertain nonlinear networked systems with both multiple stochastic time-varying communication delays and multiple packet dropouts. The discrete-time system under consideration is also subject to parameter uncertainties, state-dependent stochastic disturbances and sector-bounded nonlinearities. Sufficient conditions are...
In this paper, we maximize the allowable delay bounds that guarantee the stability of Takagi-Sugeno (T-S) fuzzy systems with time-varying delays, by adopting fuzzy weighting-dependent variables for the system dynamics elimination and the integral inequality lemma. The resulting quadratic Parameterized Linear Matrix Inequalities (PLMIs) are further relaxed by introducing some free variables to exploit...
This paper is concerned with robust stability of uncertain linear systems with interval time-varying delay. The time-varying delay is assumed to belong to an interval and the derivative of the time-varying delay is upper bounded but otherwise arbitrary. The uncertainties under consideration include polytopic-type uncertainty and linear fractional norm-bounded uncertainty. In order to obtain much less...
This paper investigates the problem of robust Hinfin control for Markovian jump systems with polytopic uncertain parameters and mode-dependent distributed delays. In terms of linear matrix inequalities, a sufficient condition for robust stochastic stability is proposed. A state feedback controller is designed such that the closed-loop system is stochastically stable and a prescribed Hinfin performance...
It is known that the PID controller is ill-suited to handle time-delay processes, especially in applications with stringent control objectives to be met. For such purposes, deadtime compensators may be used. But such controllers still face resistance towards actual industrial applications due to their difficulties in implementation and realisation. In this paper, a PID solution involving setpoint...
This paper investigates the problem of global robust stabilization by state feedback, for a family of high order feedforward (upper-triangular) nonlinear systems with delayed input. The uncertain nonlinearities are assumed to satisfy a polynomial growth assumption with a constant growth rate. The designed controllers, which are continuous but not smooth feedbacks, could achieve global asymptotical...
In this paper, we deal with the problem of delay-range-dependent robust Hinfin filtering for uncertain linear systems with time-varying delays in a range, which are subject to norm-bounded parameter uncertainties. Both the state dynamics and measurement of the system are with time-varying delays belonging to a given range. The aim of this problem is to design a full-order linear filter, such that...
This paper investigates the problem of delay dependent robust stability analysis and Hinfin filtering design for a class of uncertain continuous-time nonlinear systems with time-varying state delay represented by T-S fuzzy models. Based on a newly developed Lyapunov-Krasovskii functional combined with an improved free-weighting matrix technique, a new sufficient condition for robust stability analysis...
This paper discusses robust stability and stabilization of uncertain discrete-time fuzzy systems that have time-varying delay in state. There have been only a few results on stability and stabilization for discrete-time fuzzy time-delay systems. Especially, few results on robust stability and stabilization for a class of uncertain discrete-time fuzzy time-delay systems have appeared in the literature...
In the continuous casting process, various control strategies are used to reduce the mold level fluctuations which cause surface defects in the final product. This paper proposes a control structure able to improve the reduction of the bulging effect on the mold level. It is based on the Astroumlm's modified Smith predictor scheme which presents the advantage that the setpoint response is decoupled...
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