船体の横揺れ運動における有効波傾斜係数について

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書誌事項

タイトル別名
  • On the Effective Wave Slope in the Rolling Motion of a Ship among Waves
  • センタイ ノ ヨコユレ ウンドウ ニ オケル ユウコウハ ケイシャ ケイスウ ニ ツイテ

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説明

Since W. Froude introduced the concept of the effective wave slope in the theory of rolling motion of a ship among waves, many papers have been presented on this problem.<BR>For practical purposes, it had been a general way to take the sub-surface which passes through the center of buoyancy of a ship as the effective wave before Y. Watanabe5) treated this problem theoretically.<BR>Watanabe5) obtained the wave forces act on the ship among gentle trochoidal waves under Froude-Kriloff's assumption and introduced the reduction coefficient γ for the effective wave slope when a ship is rolling among the beam sea. Then his theory does not include the effect of, so called, active resistance following Froude-Kriloff's assumption. But S. Motora showed the varidity of the concept of the effective wave slope experimentally.<BR>Recently, M. Bessho6), 7), deduced the wave forces act on the ship among waves by applying Haskind's theory and explained theoretically the reduction coefficient γ including the effect of active resistance.<BR>In this paper, two dimensional problem on the effective wave slope in the rolling motion of a ship among waves is treated. At first, an expression for the reduction coefficient γ is presented according to Bessho's theory and the experimental methods to measure the reduction coefficient γ are discussed and then this expression for γ is compaired with Watanabe's expression and it is shown that Watanabe's expression for γ gives considerably good agreement with the γ which includes the effect of active resistance except some special cases.<BR>And then several two dimensional models are built and tested to obtain the coefficient γ, which is compared with the theoretical results.

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