Hydrodynamic Forces produced by the Swaying Oscillation of Cylinders with Chine Sections on the Free Surface.

배골형단면(背骨型斷面) 주상체(柱狀體)의 좌우동요(左右動搖)에 있어서의 동유체역학적(動流體力學的) 힘에 관하여

Hydrodynamic forces and moments produced by the swaying oscillation on the free surface were exactly calculated by Ursell-Tasai method for the cylinders with Kim's chine form sections and the sway responses of the cylinders of those chine form sections among the regular beam sea were also calculated. The results of the computation were compared with those of Lewis form sections. It is concluded that the effects of the section form on the added mass, and damping are small, if the section forms had same beam-draft ratio and sectional area coefficient in the case of sway motion. It is also known that the above little effects of section shapes on the basic hydrodynamic forces do not effect on the sway motion responses of cylinderical bodies among the regular beam sea. The sway motion responses of cylinderical bodies are varied linearly with the wave numbers.