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Delay-range-dependent control of nonlinear time-delay systems under input saturation.

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Titel:	Delay-range-dependent control of nonlinear time-delay systems under input saturation.
Autoren:	Rehan, Muhammad, Iqbal, Naeem, Hong, Keum‐Shik
Quelle:	International Journal of Robust & Nonlinear Control; 5/25/2016, Vol. 26 Issue 8, p1647-1666, 20p
Schlagwörter:	STATE feedback (Feedback control systems), TIME delay systems, SIMULATION methods & models, NONLINEAR control theory, ELECTRONIC linearization
Abstract:	This paper describes a delay-range-dependent local state feedback controller synthesis approach providing estimation of the region of stability for nonlinear time-delay systems under input saturation. By employing a Lyapunov–Krasovskii functional, properties of nonlinear functions, local sector condition and Jensen's inequality, a sufficient condition is derived for stabilization of nonlinear systems with interval delays varying within a range. Novel solutions to the delay-range-dependent and delay-dependent stabilization problems for linear and nonlinear time-delay systems, respectively, subject to input saturation are derived as specific scenarios of the proposed control strategy. Also, a delay-rate-independent condition for control of nonlinear systems in the presence of input saturation with unknown delay-derivative bound information is established. And further, a robust state feedback controller synthesis scheme ensuring L2 gain reduction from disturbance to output is devised to address the problem of the stabilization of input-constrained nonlinear time-delay systems with varying interval lags. The proposed design conditions can be solved using linear matrix inequality tools in connection with conventional cone complementary linearization algorithms. Simulation results for an unstable nonlinear time-delay network and a large-scale chemical reactor under input saturation and varying interval time-delays are analyzed to demonstrate the effectiveness of the proposed methodology. [ABSTRACT FROM AUTHOR]
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