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Feedforward and feedback control for nonlinear systems of offshore platforms

The vibration control problem of offshore jacket platforms is studied. The model of lumped masses offshore platforms with nonlinear interactions of the pile-soil affected by the wave load disturbances is established. The wave load disturbances are estimated by using the Morison equation. Based on the successive approximation approach, we propose a feedforward and feedback vibration control scheme for the nonlinear offshore jacket platforms. Numerical simulations illustrate the effectiveness of the proposed approach.