Event-triggered H∞, reliable control for offshore structures in network environments

This paper investigates the network-based modeling and event-triggered H-infinity reliable control for an offshore structure. First, a network-based model of the offshore structure subject to external wave force and actuator faults is presented. Second, an event triggering mechanism is proposed such that during the control implementation, only requisite sampled-data is transmitted over networks. Third, an event-triggered H-infinity reliable control problem for the offshore structure is solved by employing the Lyapunov-Krasovskii functional approach, and the desired controller can be derived. It is shown through simulation results that for possible actuator failures, the networked controller is capable of guaranteeing the stability of the offshore structure. In addition, compared with the H-infinity control scheme without network settings, the proposed controller can suppress the vibration of the offshore structure to almost the same level as the H-infinity controller, while the former requires less control cost. Furthermore, under the network-based controller, the communication resources can be saved significantly. (C) 2016 Elsevier Ltd. All rights reserved.