Stabilising nonlinear systems with time-varying delays by new parametrised method Online publication date: Tue, 31-Mar-2015
by Magdi S. Mahmoud, Ali Y. Al-Rayyah
International Journal of Systems, Control and Communications (IJSCC), Vol. 3, No. 1, 2011
Abstract: This paper establishes new robust delay-dependent stability and stabilisation methods for a class of nonlinear continuous-time systems with time-varying delays. The nonlinearities are unknown time-varying perturbations satisfying Lipschitz conditions in the state and the delayed-state. An appropriate Lyapunov functional is constructed and delay-dependent stability analysis is performed to characterise Linear Matrix Inequalities (LMIs)-based conditions under which the nominally-linear delay system is robustly asymptotically stable with an γ-level ℒ2-gain. Then we design delay-dependent feedback stabilisation schemes: a static one based on state (delayed-satte)-measurements and a dynamic one based on observer-based output feedback. In all schemes, the closed-loop feedback system enjoys the delay-dependent asymptotic stability with a prescribed γ-level ℒ2-gain. The feedback gains are determined by convex optimisation over LMIs and all the developed results are tested on a representative example.
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