Multiphysics modelling and experimental verification of a suspension ship running at head seas

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Motion responses of the suspension ship in head waves were simulated in the time domain.Firstly, a mesh model of the twin hull was constructed. Then, the pressure of each panel on the surface of the hull was evaluated and integrated. The hydrodynamic coefficients and wave load of the twin-hull were derived from the panel model of the ship. Next, a simplified suspension ship model was built using OrcaFlex. The simulated motion responses of the suspension ship at the rigid and free modes were verified by comparing them with the towing tank experimental results. The results showed that the simulation model was reasonable. Finally, the control forces were tuned by changing the suspension’s spring stiffness and damping coefficients. It was found that the heave and pitch of the cabin could be reduced to a certain level. However, this also revealed the limitations of the passive control system, indicating that more advanced control strategies should be considered.In summary, a basic simulation model has been developed to predict the motion responses of a suspension ship in head waves at zero advancing speed.