波浪中旋回時の非定常横揺れについて-I : 規則波中,数値シミュレーションによる検討

概要

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In the case where a ship runs in regular waves with turning manoeuvre, the rolling oscillation becomes apparently unsteady state due to the changes of the frequencies and angle of the encounter waves and can grow into large amplitude. In comparison with the case where a ship runs straight, it is so difficult for the operator of the ship to predict the heavy amplitude rolling that occurs in the condition that the encounter angle of wave changes in heavy sea condition. Therefore operators, especially of small boats, should manoeuvre the ships taking into account of this phenomenon to avoid the dangerous situation, but this theme has not been studied adequately in the past. In this study, we investigate the rolling motions that occurs on a fishing boat (180t) including consideration of turning manoeuvre by using numerical simulation assuming that the boat runs in regular wave. The result of this study shows some basic characters of rolling motion that occurs in turning manoeuvre, and some conditions for receiving the influences of the timing of rudder controlling. Additionally we consider the ways of manoeuvre to reduce the maximum amplitude of rolling motion and find some effective ways.
社団法人日本航海学会の論文
2003-03-25