Sliding Mode Control With Mixed Current and Delayed States for Offshore Steel Jacket Platforms

摘要: This paper is concerned with active control for an offshore steel jacket platform subjected to wave-induced force and parameter perturbations. An uncertain dynamic model the first established, where uncertainties not only on natural frequency damping ratio of both tuned mass damper (TMD) but also stiffness TMD are considered. Then, by intentionally introducing a proper time delay into channel, novel sliding mode scheme proposed. uses information about mixed current delayed states. It shown through simulation results that this more effective in improving performance reducing than some existing ones, such as delay-free control, nonlinear output feedback control. Furthermore, it introduced can take values different ranges while corresponding almost at same level.