船の横搖に對する抵抗の性質竝に相似則に就て

概要

論文の詳細を見る
To study the proparties of the rolling motion of ships, especially through large angles, ship-models are usually employed ; consequently a law of comparison must be in existence between them. By Mr. W. Froude's assumptions on the frictional and eddy making resistances and on the waves created by the rolling of ships it has hitherto been believed that the coefficients of extinction are constant for similar ships at corresponding periods. But it was found from experiments that these coefficients are different by a large amount between actual ships and their small models, and by a moderate amount between similar ship-models. Particular experiments were therefore carried out to stuly the nature of resistances to the rolling of ships. For the investigations on the frictional and eddy making resistances three cylinders of different diameters and a cylinder fitted with fins of various depths were suspended vertically in water sufficiently deep and caused to oscillate in various periods. As to the wave making resistance waves created by the rolling of similar ship-models were carefully measured. These experiments showed that the frictional resistance to oscillation was expressed by the sum of resistances proportional to the angular velocity and its square, the coefficients being different in each period for each cylinder ; that the eddy making resistance was expressed by the sum of resistances proportional to from first to third power of the angular velocity. the cocfficients being also different in each period for each depth of fins ; and that the height of the created wave did not vary as the amplitude of roll, but varied as the breadth of the ship-model. Based upon these results a new law of comparison was established and its validity was shown after having been applied between an actual ship and her model, and also between three similar ship-models.
社団法人日本船舶海洋工学会の論文

船の横搖に對する抵抗の性質竝に相似則に就て

スポンサーリンク

概要

著者

関連論文

スポンサーリンク