CPP装備船のピッチゼロ時の船首振れについて-II : 風外力下におけるピッチゼロ後の船首振れ現象推定モデル

概要

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It is important for the mariners to obtain the necessary information to predict the yawing motion which occurs after the propeller pitch angle is turned to zero. 19 cases of ship's behavior were measured on the CPP equipped 450 GT type vessel under the different wind condition on the different day. Ship's head deflected to starboard when the relative wind direction was from starbord side of the ship and vice versa. As the results of the analysis of the observed data, it became clear that the process of the yawing motion can be divided into three stages ; the time lag stage before the ship's head commences to turn, the growing stage of the rate of turn and the falling stage of the rate of turn. It became capable to make a prediction model of the yawing motion based on the following points. The time lag increases depending on the magnitude of the moment of wind pressure acting on the hull as expressed by the regression equation (1). The change of the rate of turn, however, has no concern with it. And the growing and falling tendency of the rate of turn after commencing the turning can be expressed by the regression equations (2) and (3).
社団法人日本航海学会の論文
1992-09-25