Decentralized adaptive output feedback control for interconnected nonlinear time-delay systems with unknown hysteresis input

In this paper, a global decentralized output feedback control is proposed for a class of interconnected nonlinear time delay systems with each subsystem involving not only the unknown parameters but also nonlinear terms linear in the unmeasured states, and being preceded with hysteresis described by the saturated PI model. By employing local modified high-gain observers, our proposed scheme can guarantee global stability of the overall closed-loop system. Furthermore, based on the prescribed performance technique, it is proved that both prespecified transient tracking performance and steady-state tracking performance can be achieved.