Effect of springing and whipping on exceedance probability of vertical bending moment of a ship
Effect of springing and whipping on exceedance probability of vertical bending moment of a ship
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DOI：
10.1016/j.oceaneng.2022.112600
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发表时间：
2022-12
影响因子：
5
通讯作者：
Surjya K. Pal;Tomoki Ono;Tomoki Takami;Akira Tatsumi;K. Iijima
中科院分区：
文献类型：
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作者：
Surjya K. Pal;Tomoki Ono;Tomoki Takami;Akira Tatsumi;K. Iijima
基于CFD与FEM耦合的降阶模型，提出了竖向弯矩极值分布方法。后巴拿马型集装箱船被认为是一个主题模型，并在我们以前的研究中进行了实验。在ROM中，所有组件的VBM，即，波浪引起的、抖动的和弹性的分量分别计算并叠加。船舶运动和波浪引起的分量估计从非线性切片理论推导出的传递函数，然后使用CFD-FEM耦合校正。使用冯卡门的动量理论，适当调整特定的船体参数，并使用CFD-FEM耦合进行额外校正，对鞭打分量进行评估。基于CFD-有限元耦合分析和实验结果，开发了一种新的半经验弹簧ROM。针对严重的短期海况，使用随机数生成大量不规则波，并将其VBM时间序列在ROM和CFD-FEM耦合分析之间进行比较。在不同的概率水平上，描述了在计算VBM的极值分布时，弹跳和鞭打的影响。本文还讨论了首尾连续砰击的影响。该方法的发展将有助于实现实时船舶装载量预测，而无需昂贵的计算成本，由于耦合CFD有限元。
An extreme value distribution method for the vertical bending moment (VBM) is developed using a reduced order model (ROM) based on CFD-FEM coupling. A post-Panamax containership is considered to be a subject model and for which experiment was performed in our previous study. In ROM, VBM for all the components, i.e., wave-induced, whipping, and springing components, are calculated separately and superimposed. The vessel motions and wave-induced components are estimated from transfer functions derived from nonlinear strip theory and later corrected using CFD-FEM coupling. The whipping component is evaluated using von Karman's momentum theory with proper adjustment to specific hull parameters and additionally corrected using CFD-FEM coupling. A new semi-empirical springing ROM is developed based on CFD-FEM coupled analysis and experimental results. A numerous number of irregular waves are generated for a severe short-term sea state using random numbers, for which VBM time series is compared between ROM and coupled CFD-FEM analysis. The effect of springing and whipping in calculating the extreme value distribution of VBM is described for different probability levels. The effect of consecutive bow-stern slamming is also discussed. The development of this method will aid to attain real-time shipload prediction without expensive computational costs due to coupled CFD-FEM.