ある被曳航バージの進路安定性とその縮率影響について

概要

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In this paper a towed barge was treated for improving her course stability and following results were obtained. 1) After some model experiments, skegs of the barge were replaced with a pair of wing type ones but the barge not only showed poor improvement in course stability but also a remarkable increase of resistance. 2) For shifting the center of lateral resistance to aft, the bottom forward of the model was trimmed down, the stern bottom was also trimmed and modified to fit a pair of skegs, keeping full breadth and full draft at the stern. By these reforms, the model showed superior ability as it was easily towed on a straight course by a tug-boat model. Accordingly, a full scale barge of this type might have good ability for keeping on course. 3) For judging course stability, Takekawa, et al have already showed us the following inequalities; A',B',C',D'>0 and A'B'C'-C'^2-A'^2D'>0. Now the author found out that total resistance coefficients in the B', C' and D' play an important role on scale effects of course stability of towed barges. Naturally, at a certain Froude number, the coefficient for a full scale barge is always smaller than that of the model's and because of this, a barge shows poor course stability comparad to that of the model.
1982-12-30