About Identification of Mathematical Models for High Speed Crafts

The response of a ship advancing in a seaway is a complicated phenomenon involving the interactions between the vessel dynamics and several distinct hydrodynamic forces. All ship responses are non linear to some extent, but in many cases a linear theory will yield good predictions. Two different approaches of the system identification method have been proposed in order to estimate models for heave, pitch and roll dynamics of a high speed craft. Both of them resolve the identification subject as an optimization problem to fit the best model. The study is focused on a ship advancing at constant mean forward speed with arbitrary heading in a train of regular sinusoidal waves.