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In this paper, the design of variable structure control (VSC) for discrete systems with time-delays is considered. The original discrete system with time-delay is simplified to discrete system without time-delay. By analyzing the disadvantage of the exponential reaching law and the variable rate reaching law, an improved discrete reaching law for discrete-time variable structure control systems is...
In this paper, we propose a decentralized adaptive output-feedback controller for a class of large-scale time-delay nonlinear systems with unknown high-frequency-gain signs. We establish global asymptotic stabilization results, without using Razumikhin Theorem or constructing Lyapunov-Krasovskii functionals. The paper enlarges the class of large-scale nonlinear systems for which global decentralized...
A Smith Predictor-like design for compensation of arbitrarily long input delays is available for general, controllable, possibly unstable LTI finite-dimensional systems. Such a design has not been proposed previously for problems where the plant is a PDE. We present a design and stability analysis for a prototype problem, where the plant is a reaction-diffusion (parabolic) PDE, with boundary control...
In this paper, the problems of delay-dependent robust stability analysis and robust stabilization are investigated for uncertain discrete-time singular systems with state delay. First, by making use of the delay partitioning technique, a new delay-dependent criterion is given to ensure the nominal system to be regular, causal and stable. This new criterion is further extended to singular systems with...
This paper deals with the asymptotical stability problem for a class of feedforward nonlinear systems with delays in the state and input. The uncertainties in the systems are assumed to be dominated by upper polynomial functions multiplying by an incremental rate depending on the input or delayed input. Based on the state transformation of nonlinear systems and the Lyapunov method, both linear state...
In this paper, adaptive state feedback actuator failure compensator for networked control systems (NCSs) with state dependent disturbances are developed. The obstacles of NCSs such as; transmission delays and data-packets dropout induced by the insertion of data networks in the feedback adaptive control loops are also considered. Adaptive laws are designed for updating the controller parameters. Closed-loop...
The paper considers stability and robust H∞ controller design for discrete-time systems with random communication delays and state quantization. Communication delays between sensors and controllers are modeled by a finite state Markov process. Measurements are assuming to be quantized by a logarithmic quantizer, and the effect of quantization errors are incorporated into the controller design. Based...
This paper presents a wavelet based adaptive observer based control strategy for a class of uncertain multiple input multiple output (MIMO) delayed nonlinear systems subjected to actuator saturation. The time delay observer presented in this paper is the extension of observer design for SISO systems. The proposed wavelet adaptive observer performs the task of identification of unknown system dynamics...
In this paper, the delay-dependent H∞ performance criterion which possesses decoupling structure is derived for systems with time-varying delay. It can reduce conservatism inherent in the classical quadratic method by providing a parameter-dependent Lyapunov function. Then the robust H∞ controller is designed for time-delay systems with polytopic uncertainty. All the conditions are given in terms...
Motivated by the insertion of a communication network in the feedback control loop, this paper presents a new state- and input-time-varying delay-dependent criterion that ensures the stability of the closed-loop system with a memoryless state feedback controller, by exploiting a new Lyapunov-Krasovskii functional and by using some changes of variables and schur complements. Next, sufficient condition...
The paper addresses the controller design problem for a class of teleoperation systems. The forward and the backward transmission time delays are time-varying and asymmetric. The velocities of the master and slave joints are not available and the precise mathematical robot models are also not known. For dealing with the control problem, we first design a high gain observer to estimate the velocities...
This Paper investigates the mean to design the observer and observer based controllers for a class of delayed nonlinear systems with Lipschitz conditions and unknown dynamics subjected to input constraints. A new design approach of full order wavelet based adaptive observer is proposed. Wavelet neural networks (WNN), which are having superior learning capability in comparison to conventional neural...
This paper studies the robustness of networked predictive control systems (NPCS) with uncertainties. A networked predictive control strategy that compensates for delay actively rather than passively is introduced to cope with - varying network delay and data dropout. The closed-loop networked predictive control system is described as a normal robust control system, which makes the control design and...
This paper presents a discrete control design for time-delay systems subjected to the periodical command signal or exogenous disturbances. Unlike other dead-time compensators (DTC), we take profit of the system components to construct an internal model. In addition, a novel disturbance observer is developed to compensate the effect of disturbances, and thus to achieve tracking and disturbance rejection...
This paper addresses the problem of designing robust static output-feedback controllers for nonlinear network based controller design for the given T-S fuzzy model. The effects of both network-induced delays and data packet dropout will be investigated. Based on an integral inequality and a matrix inequality, a delay-dependent sufficient condition for the existence of a network-based controller is...
This paper deals with the problem of stabilization for a class of networked control systems (NCSs) with random time delay via the state feedback control. The transmission delay is modeled as a Markov process, and the resulting closed-loop system is modeled as a Markovian jump linear system (MJLS). Based on Lyapunov stability theorem combined with linear matrix inequalities (LMIs) techniques, A new...
In this paper the stability analysis and control synthesis problems for networked control systems (NCS) with bounded transmission delays (constant and unknown or time-varying) are investigated. First, stability conditions for NCS described by ARMA models are established and a method for the determination of admissible delay range is developed. Then, a linear programming method for the design of linear...
The use of networks in control systems to connect controllers and sensors/actuators has become a common practice. A networked switched control system, a special case of such systems, is studied in this paper by making use of linear descriptor system theory. Such a control system is modeled as switched delay systems involving network-induced delay and packet dropout. Sufficient conditions for robust...
This paper addresses stability analysis and controller design for discrete-time positive systems with multiple delays. The control is under positivity constraint, which means that the resulting closed-loop systems are not only stable, but also positive. The contribution lies in two aspects. First, a set of necessary and sufficient stability conditions is established for delayed discrete-time positive...
This paper addresses stability analysis and controller design for discrete-time positive systems with multiple delays. The control is under positivity constraint, which means that the resulting closed-loop systems are not only stable, but also positive. The contribution lies in two aspects. First, a set of necessary and sufficient stability conditions is established for delayed discrete-time positive...
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