Variable structure robust fin control for ship roll stabilization with actuator system

The ship roll stabilization by fin control system with actuator is considered in this paper. Assuming that there exist uncertain parameters and uncertain external perturbations in the ship roll model, a variable structure robust control algorithm for ship roll stabilization system is presented for a class of uncertain systems with the absence of matching assumption in which the uncertainty is not acted within channels implicit in the control inputs. A simulation example illustrating the method described is included in this paper. It is shown that it makes the designed system guarantee the performance of robustness with respect to the perturbations and uncertainties.