高速コンテナ船の斜波中波浪強制力について : ストリップ法による波浪強制力計算における周波数のとり方

概要

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In the strip methods of OSM, NSM and STF, the wave exciting forces are expressed in terms of the added-mass and damping coefficients evaluated at the encounter frequency, ω_e. In the Newman's strip method, however, they are expressed in terms of the coefficients as a function of the incident wave frequency, ω_o, In this paper, it is assumed that the diffraction potential for the vertical exciting forces is periodic in the x-direction (the x axis is positive forward), while the diffraction potential for the horizontal exciting forces is slowly varying in the x-direction. From these assumptions, it is obtained that the vertical exciting forces should be calculated on ω_o and the horizontal exciting forces should be calculated on ω_e. The exciting forces on a model of S-175 container ship in regular oblique waves are measured in IHI Seakeeping and Maneuvering Tank and the test results are compared with the calculations on ω_e and ω_o. The followings are conclusive results ; 1) Test results of heave exciting forces and pitch exciting moments are in good agreement with the calculations on ω_o, and show no effect on the forward-speed. 2) Test results of sway exciting forces and yaw exciting moments show a good agreement with the calculations on ω_e.
社団法人日本船舶海洋工学会の論文
1982-12-30