A Simple Prediction Formula of Roll Damping of Conventional Cargo Ships on the Basis of Ikeda's Method and Its Limitation
A Simple Prediction Formula of Roll Damping of Conventional Cargo Ships on the Basis of Ikeda's Method and Its Limitation
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DOI：
10.1007/978-94-007-1482-3_26
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Y. Kawahara;K. Maekawa;Y. Ikeda
中科院分区：
文献类型：
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作者：
Y. Kawahara;K. Maekawa;Y. Ikeda
由于船舶横摇阻尼具有明显的粘性效应，理论计算比较困难。因此，在船舶设计阶段，横摇阻尼的计算一般采用试验结果或预测方法。在众多的船舶运动预报方法中，Ikeda的方法被广泛应用于船舶运动的计算机程序中。利用该方法计算了不同底龙骨结构的船体横摇阻尼，探讨了其特性。通过改变长度、梁长、吃水、船中剖面系数和棱柱系数，系统地改变了船体型。在此基础上，推导出了一个非常简单的船舶横摇阻尼预报公式。然而，发现该公式不能用于具有较高重心位置的船舶。
Since the roll damping of ships has significant effects of viscosity, it is difficult to calculate it theoretically. Therefore experimental results or some prediction methods are used to get the roll damping in design stage of ships. Among some prediction methods, Ikeda’s one is widely used in many ship motion computer programs. Using the method, the roll damping of various ship hulls with various bilge keels are calculated to investigate its characteristics. Ship hull forms are systematically changed by changing length, beam, draft, midship sectional coefficient and prismatic coefficient. On the basis of these predicted roll damping of various ships, a very simple prediction formula of the roll damping of ships is deduced. It is found, however, that this formula cannot be used for ships that have higher position of the center of gravity.