At fishery harbors facing to open − sea , accidents which is concerned the ship mooring Qr entering into a harbor sometimes happen under severe wave conditions . However , there are few reseaches of these motions due to a necessity of long term observations and their risky works . In order to avoid the cost and the risk , we try to simulate the irregular wave trains that fishermen call " 3 big and 4 small waves " o ビ 3 big and 8 snユall waves " by the small ship repeated turning . It is found that the irregular wave trains can be made easily by changing the ship ' s speed and rudder angle .
Ships generally , increase or decrease their speeds and turn inside a port . The time for these ma ・ noeuvres has to be taken into account even if they are high speed vessels . Recently, a time saving for transportation is required for the sake of high speed transportation , so it is necessary to make a time consuming model based on the ship speed inside a port , In this paper , a calculation model for the required time is investigated using three types of ferry boats.
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