A Study on Roll Characteristics of a Hard-chine Craft

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  • 小型ハードチャイン艇の横揺れ特性に関する研究
  • コガタ ハードチャインテイ ノ ヨコユレ トクセイ ニ カンスル ケンキュウ

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Abstract

In the present study the roll characteristics of a small hard-chine craft whose length between perpendiculars is smaller than 12m are experimentally investigated. Three kinds of crafts are chosen to measure the roll damping, wave exciting forces and ship motions in regular beam seas. Through the experimental works in measuring the roll damping moment, it is confirmed that the roll damping can be predicted in enough accuracy by using a potential flow theory for the wave component and the prediction method for the viscous component proposed by one of the authors. The wave exciting moment acting on the hull in beam seas are measured by two different ways, the first one is the measurement of the roll moment acting on a fixed model in waves and the another one is that acting on it in free condition of sway and heave motions in waves. The agreements between measured exciting moment by former way and calculated one depend on the hull shape of a craft. The measured ones by the latter way are much smaller than the calculated Froude-Krylov force. From the comparison between calculated and measured roll resonant angle, it is found that the calculated roll resonant angle by OSM can be much larger than experimental one and that the difference is caused by the error in prediction of the cross-couping moments from sway to roll in addition to the disagreement in the wave exciting roll moment and sway force. Finally the prediction method to estimate the roll resonant angle of such a small craft in the Japanese Stability Standard is discussed.

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