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Lyapunov-Krasowskii functionals are used to design quantized control laws for nonlinear continuous-time systems in the presence of time-invariant constant delays in the input. The quantized control law is implemented via hysteresis to avoid chattering. Under appropriate conditions, our analysis applies to stabilizable nonlinear systems for any value of the quantization density. The resulting quantized...
This paper presents a new stability analysis of linear networked control systems. The new method is inspired by discontinuous Lyapunov functions that were introduced by using impulsive system representation of the sampled-data and of the networked control systems respectively. In the recent paper piecewise-continuous (in time) Lyapunov-Krasovskii functionals have been suggested for the stability analysis...
According to the characteristics of long time-delays, large inertia and time-variation in the dissolved oxygen control method of sewage treatment, one fuzzy-Smith control model on dissolved oxygen control is presented in this paper. This model has the merits of a high robustness in fuzzy controller and a compensation for time delay in Smith predictor. After simulation experiment, the result is shown...
The paper investigates the problem of designing a digital controller with guaranteed performance for a continuous-time plant with time-delay. The proposed design technique is based on the parametric transfer function concept and numerical optimization.
Because of the long distance between the last finishing mill and the X-ray thickness gauge, there was a long delay time for the AGC system to get the gauge error information feedback, which has some negative effect on the control of strip thickness, so the monitor AGC was not a control system in time. According to the virtual model fitted by true measured parameters, the Smith predictor in the monitor...
This paper deals with discrete-time multivariable feedback systems that are subject to sensor time delays. Supposing a controller exists that provides good performance without sensor delays, we consider how an estimator can be used to recover closed-loop performance when sensor time delays are introduced into the feedback loop. Using separation principle arguments, we first show that stability and...
In this paper, we provide a new delay-dependent stabilization scheme for a class of linear time-delay (LTD) systems based on proportional-integral-derivative (PID) Hinfin feedback. The time-delay is a differentiable time-varying function satisfying some bounding relations. An appropriate Lyapunov-Krasovskii functional (LKF) is constructed and a new parametrized characterizations for proportional-integral-derivative...
So far, the author developed the parametrization of all strictly causal stabilizing controllers in the framework of the factorization approach. The objective of this paper is to extend the previous results, the parametrization of all strictly causal stabilizing controllers with some conditions. Since the factorization approach has been used, the result can be applied to numerous linear system models.
Packet dropout is one of the key issues which degrade performances of Internet-based Control System(ICS). An integrated strategy composed of active part and passive part to solve this problem is proposed in this paper. In the active part, the priority of control packets in ICS can be improved through differentiated services which decrease probability of control packet dropout. While in the passive...
This paper is concerned with simultaneous stability of a collection of continuous-time linear plants whose feedback control loops are closed via a shared digital communication network. Because of the limitation of communication capacity, only a limited number of controller-plant connections can be accommodated at any time instant. Therefore, it is necessary to carefully design the scheduling policy...
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