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：东亚地区海运量的急剧增长、航运公司为增强竞争力而结成联盟、港口设施的迅速现代化等。集装箱船舶的这种尺度变化给海军工程带来了一些新的问题。其中之一是船首-拉平砰击的问题。在常规集装箱船的设计阶段，根据中小型集装箱船船首喇叭形结构的损伤记录，采用了一个简单的设计公式。然而，船舶尺寸的快速变化使得船舶设计人员很难将设计公式应用于最近出现的超大型集装箱船。在这项研究中，数值方法来预测的砰击载荷是施加在大型集装箱船的船头进行了研究。在三维数值方法的开发过程中，由于有大量的数据可供验证，因此将数值程序应用于一个类似的碰撞问题--晃荡问题，对程序进行了验证。在验证了数值方法的有效性后，将其应用于某后巴拿马型集装箱船的船首-外展砰击问题。进行了一系列大比尺模型试验，研究了船首外展板上的冲击压力、局部波高、甲板上的绿色水、船舶运动等，测定了同时进行了数值模拟和模型试验。认识到二维方法的局限性，肯定了三维方法的优越性。本文的三维数值计算方法对合理预测大型集装箱船船首外展部的冲击压力有一定的参考价值。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.