Hydrodynamic Moments produced by Rolling Oscillation of Cylinders with Chine Sections

배골형단면(背骨刑斷面) 주상체(柱狀體)의 횡동요(橫動搖)에 있어서의 부가관성(附加慣性)모우먼트와 감쇠(減衰)모우먼트에 관하여

Hydrodynamic moments produced by the rolling oscillation on the free surface and the associated swaying force were exactly calculated by Ursell-Tasai method for the cylinders with Kim's chine form sections($a_1,\;a_7$). The coefficient of the added moment of inertia $K_{\varphi^{\tau}}$, the progressive wave height ratio $\bar{A}$, the coefficient of swaying forces $K_{RS}$, ${\alpha}_{RS}$ of rolling oscillations are shown in the several figures. The results of the computation were compared with those of lewis form sections. It is concluded that the effect of the section form on the added moment of inertia is significant for the cylinder with the section of same beam-draft ratio and sectional area coefficient, on the other hand, a little effect appears on the wave damping.