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In this paper, we propose a robust H∞/L1 control system for a high purity distillation column. The original nonlinear model of the column is of high order and it includes parametric uncertainty. A reduced-order linearized model of the distillation column is used to design a 2-DoF multi-objective H∞/L1 controller which ensures robust stability of the closed loop system and fulfillment of certain design...
An alternative way to control a nonlinear system, such as a two Degree Of Freedom helicopter, is the linearization of the model around an equilibrium point, in this case, an equilibrium point around the Pitch angle. Subsequently, the design a Robust Controller for this system is done, using a the DK iteration method. However, when a variation of an angle such as its uncertainty is modeled, the performance...
We address robust stabilization problem for networked control systems with nonlinear uncertainties and packet losses by modelling such systems as a class of uncertain switched systems. Based on theories on switched Lyapunov functions, we derive the robustly stabilizing conditions for state feedback stabilization and design packet-loss dependent controllers by solving some matrix inequalities. A numerical...
Controller design for magnetic levitation systems is considered problematic due to the parametric uncertainties in mass, strong disturbance forces between the magnets, and noise effects inflowing from sensor, and input channels. In this paper, an LMI based solution is proposed for the position tracking problem of a magnetic levitation system in the presence of parametric uncertainties. Moreover the...
This paper applies robust control strategies to an air motor system. Due to the nonlinear characteristics of this system, a robust controller is designed to provide the robust performance. The study is carried out in three parts. Firstly, system identification using experimental data is applied to determine the parameters of the air motor system model. The nonlinear system model of the air motor system...
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