Abstract
This paper is concerned with active control for an offshore steel jacket platform subject to nonlinear wave-excited forces and parameter perturbation by using an adaptive control law and combining it with sliding mode control scheme. This novel control scheme is an adaptive integral sliding mode controller (AISMC). Then by considering vibration frequencies uncertainties and damping ratio uncertainties of offshore steel jacket platform, we have designed (RAISMC) control scheme. It is shown through simulation results, compared with some existing control schemes, this controller has a better performance in reducing oscillation amplitudes of the three floors of offshore platform with much less control force.
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