Abstract
In the previous paper, we tried to simulate the irregular wave trains by the small ship repeated turning. As the result, it was found that the irregular waves could be made easily. In this paper, we carry out an experimental study on the ship motions of entering fishing boat under these waves. The obtained results are summarized as follows : (1) The rolling angle is piled up by the ship's turning and the severe waves at ship entering into harbour. The angle of inclination increase in inverse proportion to the radius of turning circle. (2) The fishing boat which is entering harbour in quartering sea arises rolling and yawing motions at once. These coupling motions seem to have important connection with a ship capsizing phenomenon near harbour entrance. (3) It is found that the waves beneath the running fishing boat correspond with the accelerations of heaving and the inclinations of these waves correspond with the accelerations of surging.
