Network-Based Modeling and Active Control

Abstract

The network-based modeling and active control for an offshore steel jacket platform with an active tuned mass damper mechanism is investigated in this chapter. A network-based state feedback control scheme is developed. Under this scheme, the corresponding closed-loop system is modeled by a system with an artificial interval time-varying delay. Then, a delay-dependent stability criterion for the corresponding closed-loop system is derived. Based on this stability criterion, a sufficient condition on the existence of the network-based controller is obtained. It is found through simulation results that (i) both the oscillation amplitudes of the offshore platform and the required control force under the network-based state feedback controller are smaller than those under the nonlinear controller [65] and the dynamic output feedback controller [100]; (ii) the oscillation amplitudes of the offshore steel jacket platform under the network-based feedback controller are almost the same as the ones under the integral sliding mode controller [99], while the required control force by the former is smaller than the one by the latter.