Research on the safety of ship to ship transfer operations from the view point of maneuverability of ships

目前，原油从大船转小船的打捞作业在世界范围内普遍进行。在近海装卸的情况下，货物的转移是在两艘船有动力的情况下进行的，这被称为在航转移。本研究的目的是了解这些船舶在作业过程中的水动力特性和操纵性。本研究包括三个主题。首先，根据拖曳水池中的操纵模型试验结果和操纵模拟结果，讨论了组合船舶在航转移时的横摇能力和航向稳定性。其次，在考虑两船相互作用力的情况下，对靠泊作业进行了仿真。分析了载荷条件对船舶靠泊机动运动的影响。第三，还研究了深水和浅水中近距离船舶的船体与舵的相互作用。

Nowadays the lightering operation in which the crude oil is transferred from a large ship to small one is commonly conducted in worldwide scale. In the case of lightering offshore, the cargo transfer is carried out with the two ships under power which is called as underway transfer. The purpose of this study is to understand the characteristics of hydrodynamic forces acting on those ships and maneuverability of them during the operation. Three topics are included in this study. First, the yawing ability and course stability of the combined ship engaged in underway transfer were discussed based on the results of captive model test in the towing tank and maneuvering simulation. Next, the berthing operation was simulated in consideration of the interaction forces between two ships. The effect of loading condition on the maneuvering motions in berthing was evaluated. Third, the hull to rudder interactions of ships in close proximity were also studied both in deep and shallow water.