船体上下振動付加質量の三次元修正値について : 第2報振動圧力の測定による修正値分布

概要

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In the present paper, the local reduction factor for the two-dimensional virtual mass in the vertical vibration of Lewis-formed ship hull is attempted to calculate with the aid of measurements of hydrodynamical pressures at the special points of a contour of each section of the hull along her length under water line of a model ship.As a result, the considerable reduction of the local factors at the near from both ends of a cylinder which previously calculated by the author was clearly confirmed in the present experiments. However, the results from the models of ship like beam were obtained with different tendency that the distribution of the local reduction factor is almost constant along ship length. Consequently, we may safely assume that the total reduction factor, J, may be applied for three-dimensional correction of the virtual mass in the vertical vibration of a ship hull as usual method, however it will be expected that considerable local reduction of the three-dimensional factor on the virtual mass in the horizontal vibration of ships appears at the near from both ends.
社団法人日本船舶海洋工学会の論文