PERFORMANCE AND DYNAMIC STABILITY OF A HIGH SPEED SEMI-SUBMERSIBLE VEHICLE WITH WINGS

The possibility of a semi-submersible displacement-type high-speed ship with wings as a medium-distance high speed transport vehicle is studied, with particular emphasis on resistance and lifting force, motions among waves and stable running with active control. The high speed is realised by submerging the main hull by downward lifting force generated by the wing. The submersion remarkably reduces the wavemaking resistance. The wing contributes to reduce the resistance through the cancellation of the waves under calm conditions and among waves. With regard to the motions among waves, it is concluded that the wave may not be a momentous factor for HSV. To study the possibility of active control by the flaps, the motions are simulated by solving the motion equations numerically. Four freedom running experiments were carried out where the heaving, rolling, pitching and swaying motions are free. Results showed that the active control assures stable running of the vehicle even by a simple control system.