船の前進抵抗におよぼす船首揺の影響に関する一実験

概要

論文の詳細を見る
It is well known that a full ship having a block coefficient over 0.78, has a directional instability and always yaws and consequently increases her ahead resistance and also that the fact is one of the reasons why the ahead resistance estimated from model tests does not agree with actual ship trial results. The authors carried out resistance experiments on the three full ship models artificially forced yawing and examined the effect of yawing on the ahead resistance of ships. The results are as follows; (1) The amount of ahead resistance of ships with yawing is higher than that without yawing. (2) The rate of increase of ahead resistance of ships due to yawing ΔCrs/Css is represented in the following form. (ΔCrs)/(Css)=K(0.9F+63F^2) where F=(fLα_0)/V=(f√<L/g・α_0>)/(V/√<gL>) F is determined by an amplitude of yawing angle α0, a corresponding frequency of yawing =f√<L/g> and Froude's number V/√<gL>. K means a scale effect and is given in the diagram as functions of length of ships, block coefficients and Froude's number. (3) The rate of increase of ahead resistance of ships due to yawing decreases with the increase of speed and block coefficients and also with the decrease of length of ships.
社団法人日本船舶海洋工学会の論文
1962-03-30