Abstract
We discuss the observer‐based robust controller design problem for a class of nonlinear fractional‐order uncertain systems with admissible time‐variant uncertainty in the case of the fractional‐order satisfying 0 < α < 1. Based on direct Lyapunov approach, a sufficient condition for the robust asymptotic stability of the observer‐based nonlinear fractional‐order uncertain systems is presented. Employing Finsler’s Lemma, the systematic robust stabilization design algorithm is then proposed in terms of linear matrix inequalities (LMIs). The efficiency and advantage of the proposed algorithm are finally illustrated by two numerical simulations.
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