Stabilizer fin effect on SWATH ship motions and disturbance observer based control design

This paper sets out to explore the stabilizer fin effect on SWATH ship motions. And control design based on disturbance observer are presented. Stabilizer fin effect on ship motions is studied by transforming into foil lift damping. Disturbance observer (DO) is present to study SWATH wave disturbances. It can be used compensate the wave disturbance by fins. In the controller design the optimal controller is designed firstly, then DO is used to achieve feedback compensation of wave disturbances, and to enhance the controller performance of the original controller. System stability is theoretically proved. Also motion induced sickness is presented to directly show the controller effect on human responses. Simulation results prove the method efficiency.