|Observer-based Reliable Control for Lipschitz Nonlinear Networked Control Systems with Quadratic Protocol
Ali-Akbar Ahmadi* and Farzad R. Salmasi
International Journal of Control, Automation, and Systems, vol. 13, no. 3, pp.753-763, 2015
Abstract : In this paper, observer-based reliable control problem for nonlinear networked control systems (NCSs) with quadratic protocol (QP) in presence of actuator fault is studied. Two sensor nodes are employed for system output measurement and transmission to remote observer-based reliable controller (RORC) based on QP. In spite of the majority of the existing results, both measurement and actuation channels are taken into account for data transmission of sensor-to-RORC and RORC-to actuator, respectively. A RORC is developed to estimate the system states and simultaneously generate the control input at its side. The closed-loop system is modeled by a hybrid system with interval time-varying delays in continuous dynamics and in the reset conditions. By using Lyapunov-Krasovskii functional method and some matrix manipulations, designing of RORC and the QP parameters are formulated in linear matrix inequalities (LMIs) framework with equality constraint. Numerical simulations are presented to show the effectiveness and applicability of the proposed approach.
Keyword : Actuator fault, networked control system (NCS), network-induced delay, packet dropout, quadratic protocol (QP), remote observer-based reliable controller (RORC).