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(Robust Non-fragile $H^\infty$ Controller Design for Parameter Uncertain Systems)  

Jo, Sang-Hyeon (School of Electronic & Electrical Engineering, Kyungpook National University)
Kim, Gi-Tae (School of Electronic & Electrical Engineering, Kyungpook National University)
Park, Hong-Bae (School of Electronic & Electrical Engineering, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.39, no.3, 2002 , pp. 183-190 More about this Journal
Abstract
This paper describes the synthesis of robust and non-fragile H$\infty$ state feedback controllers for linear varying systems with affine parameter uncertainties, and static state feedback controller with structured uncertainty. The sufficient condition of controller existence, the design method of robust and non-fragile H$\infty$ static state feedback controller, and the set of controllers which satisfies non-fragility are presented. The obtained condition can be rewritten as parameterized Linear Matrix Inequalities(PLMls), that is, LMIs whose coefficients are functions of a parameter confined to a compact set. However, in contrast to LMIs, PLMIs feasibility problems involve infinitely many LMIs hence are inherently difficult to solve numerically. Therefore PLMls are transformed into standard LMI problems using relaxation techniques relying on separated convexity concepts. We show that the resulting controller guarantees the asymptotic stability and disturbance attenuation of the closed loop system in spite of controller gain variations within a degree.
Keywords
Non-fragile control; robust $H^\infty$ control; state feedback; parameterized Linear Matrix Inequality;
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