Sliding Mode Control for Ship Roll - fin against swinging induced by waves and uncertainty

In this paper, the sliding mode control is designed for ship roll-fin dynamic to decrease the effects of the disturbance and uncertainties. For design of sliding mode control in the first The nonlinear model of the system is considered and then uncertainties are added to the model. The sliding mode control is designed to overcome on the uncertainties and disturbances. The stability of the closed loop system is proved by using lyapunov method. To evaluate the performance of the proposed method, some simulation is done and result is compared with the PID controller. The results shows the proposed method have preference performance respect to PID method. smaller variations in roll of the ship when the sliding mode control is used.