Research on Bow Slamming Load of Post-Panamax Container Ship

自20世纪90年代以来，集装箱船的规模显著增加。造成这一现象的原因有东亚地区海上运输量的急剧增加、航运公司为加强竞争能力而结成联盟、港口设施的快速现代化等。集装箱船的这种尺寸变化给船舶工程带来了一些新的问题。其中之一是弓照明弹撞击的问题。在常规集装箱船的设计阶段，采用了基于中小型集装箱船艏耀斑结构损伤记录的简单设计公式。然而，船舶尺寸的快速变化使得船舶设计者难以将设计公式应用于最近出现的超大型集装箱船舶。本文研究了大型集装箱船舶艏部撞击载荷的数值预测方法。在开发三维数值方法的过程中，由于有大量的数据可供验证，因此将数值程序应用于类似的碰撞问题晃动进行了验证。在对数值方法进行验证后，将该方法应用于某超巴拿马型集装箱船的艏照明弹轰击问题。进行了一系列大比例尺模型试验，测量了艏耀斑冲击压力、局部浪高、甲板绿水、船舶运动等参数。进行了数值模拟，并对模型试验结果进行了验证。认识到二维方法的局限性，确认了三维方法的优越性。本文的三维数值计算方法对大型集装箱船艏照明器的冲击压力进行了合理的预测。我们已经发表了25篇与这项研究相关的研究论文。

The size of container ships has been remarkably increased since 1990s. There are several reasons for this phenomenon such as striking increase of the volume of marine transportation in East Asia, alliance of shipping companies to strengthen their competitive business power, rapid modernization of port facilities, etc. This size change of container ships leads to some new problems in naval engineering. One of them is a problem of bow-flare slamming. In the design stage of conventional container ships, a simple design formula based on the damage records of bow flare structures of small and medium sized container ships has been used. However the rapid change of the ship size makes it difficult for the ship designers to apply the design formula to recently appearing very large container ships. In this study a numerical approach to predict the slamming load that is exerted on the bow of large container ships has been studied. In the process of developing 3D numerical method, the numerical program was validated by applying it to a similar impact problem called sloshing since a lot of data for validation were available. After validating the numerical method, it was applied to the bow-flare slamming problem of a Post-Panamax container ship. A series of large scale model experiment were performed, and impact pressure on the bow flare, local wave elevation, green water on deck, ship motion, etc., were measured. Numerical simulations were also carried out and the results of model experiment were examined. The limit of 2D method was realized and the superiority of 3D method was confirmed. Our 3D numerical method is useful to predict reasonably the impact pressure that is exerted on the bow flare of large container ships. We have published 25 research papers that are related to this study.