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Real time network applications require effective mechanisms for managing Internet traffic in order to avoid or at least limit the level of congestion. We propose, design and analyze an Active Queue Manager (AQM) for controlling jitter using robust control theory. We used an output feedback controller and this controller is based on discrete-time model of TCP. The natural properties of robust controller...
The symmetric control systems have some interesting properties. This paper studies a class of symmetric system consists of a collocated second-order plant and a static output feedback controller. For the system, it is known that the internal stability and the robustness of the closed-loop system are guaranteed based only on the non-parametric structure condition. Our objective is to propose an optimal...
A globally stabilizing decentralized output-feedback controller is proposed for a general class of nonlinear interconnected large-scale systems. The subsystem interconnections and the dynamics of each subsystem feature both parametric and functional uncertainty. The controller design is based on a general high-gain scaling technique that utilizes arbitrary powers (instead of requiring successive powers)...
We address the output feedback sliding mode control problem for a sampled data linear system with disturbances. By taking into account the disturbance compensation, a deadbeat high gain output feedback control strategy with additional dynamics is able to attenuate the disturbances. It is shown that the closed loop system exhibits both singularly perturbed and weakly coupled characteristics. A numerical...
In this paper, we describe the controller design method for nonlinear radar gimbal stabilization system with time-delay with polytopic uncertainty. In order to consider nonlinearity of the gimbal bearing frictional torque, we represent T-S fuzzy model for the nonlinear gimbal system. And the represented model can be rewritten as Parameterized Linear Matrix Inequalities (PLMIs), that is, LMIs whose...
A simple controller design method for a two-degree-of-freedom (TDF) Smith predictor control system is investigated to obtain an improved performance of setpoint tracking and disturbance attenuation. The setpoint tracking controller and disturbance rejection controller in TDF Smith scheme are designed as ideal PID controller and approximate derivative PID controller, respectively. Each controller is...
This paper considers the low order Hinfin controller design method for reference tracking and disturbance attenuation based on the recent development on robust control in terms of the generalized KYP (GKYP) lemma. The new design control strategy does not need to choose the weighting functions as the classical design method does so that the controller will have the same order as the controlled plant,...
This paper deals with reduced order model predictive control for input-constrained discrete-time linear systems with disturbance attenuation. By introducing a decomposition technique for a quadratic cost functional, an MPC law is obtained from a reduced order optimization problem. The fundamental properties of the resulting MPC law are discussed.
Fictitious reference iterative tuning (FRIT) is a method for designing the feedback controller of an unknown plant model by optimizing the performance index that consists of the fictitious reference output computed from one-shot experimental input-output data. This paper proposes a PID gain tuning for disturbance attenuation using FRIT method. While the conventional FRIT tunes the PID gains so that...
This paper presents a Takagi-Sugeno (T-S) fuzzy model-based regulator for a class of discrete time-delay affine uncertain systems. Not only multiple state/input delays but also the parametric uncertainty are considered simultaneously in this paper. First, the fuzzy output regulator is proposed by introducing a memoryless fuzzy observer and a fuzzy integral compensator. Next, the asymptotic output...
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