Global decentralized output feedback control for interconnected time delay systems with saturated PI hysteresis

摘要

In this paper, a global decentralized adaptive output feedback control is proposed for a class of nonlinear interconnected time delay systems, in which each subsystem covers unknown parameters, the unmeasured states dependent nonlinearities, and unknown saturated PI hysteresis. By constructing modified dynamic high-gain observers, together with backstepping technique, the unmeasured states dependent nonlinearities that fail to match global Lipschitz condition can be well disposed and global stability of the overall closed-loop system is obtained. With the aid of a new adaptive law, the restrictive assumption requiring known bounds of the time-varying delays in the existing literature is removed. Furthermore, based on the prescribed performance technique, it can be proved that both steady state and prespecified transient tracking performance are able to be guaranteed. (C) 2020 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.