減揺タンクの効果について
スポンサーリンク
概要
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This paper deals with the effectiveness of U-tube type antirolling tanks paying particular attention to the following four points : 1) Effect of the vertical position of the tank from the center of gravity of a ship. 2) Effect of saturation i.e., performance of a tank when the tank water hits the top of the tank and is prevented its motion. 3) Effect of non-linearity of ship motion as well as tank water movement. 4) Effectiveness of tanks in transient states. For 1), the author showed a simplified form of expression for the effect of the vertical position and showed that the effective strength factor of a tank was evaluated by multiplying (1-ω_s^2/ω_<st>^2) to the strength factor of the tank where ω_s is the natura1 frequency of the ship and ω_<st> is the de-coupling frequency of the tank. For 2), the author showed that the effect of saturation caused not only the reduction of tank moment but a phase lag resulting in considerable decrease of tank effectiveness. For 3), the author discussed the tank effectiveness introducing nonlinear terms. For 4), the author showed that a tank was not sufficiently effective for transient stages.
- 社団法人日本船舶海洋工学会の論文