角水槽における自航模型船の最適加速法

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When self propulsion tests both in still water and in waves are carried out in the basin without a towing carriage like Mitaka No.1 Ship Experiment Tank (L×B=80m×80m) , there is a problem that the test data with high accuracy can not be obtained because of the restriction of the effective water area. In order to solve this problem the method of the optimum acceleration of the model for the rapid convergence to a final speed using the propeler is proposed and it is shown that the test data of high accuracy are obtained by means of the proposed method. The equation of motion for the accelerated model and its solution are expressed analytically and the characteristics of the accelerated motion are discussed with relation to the propeller characteristics, self propulsion factor, resistance and virtual mass of the model. Several methods for evaluating the optimum time of the acceleration by the propeller are presented and it is shown that the agreement between the evaluation and experiments is satisfactory. The accelerated motion of the model in waves is also examined and the optimum acceleration time is shown to be shorter than that in still water. The difference between a container ship and an ore carrier concerning the characteristics of the accelerated motion is examined and it is concluded that the optimum acceleration time of the ore carrier requires two or three times as long as that of the container ship in normal sea speed respectively, and that the ore carrier is more affected by the added resistance due to waves than the container ship.
独立行政法人海上技術安全研究所の論文
1985-01-30

角水槽における自航模型船の最適加速法

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