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Development of empirical formulations of slamming loads for displacement vessels

机译：驱替船舶撞击载荷的经验公式的开发

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The paper presents an empirical method to calculate slamming load acting as bottom impact pressure on the forward region of the vessel. Firstly, hull shape coefficient as a function of the deadrise angle of the section is derived. Relative velocity is derived in terms of the extreme motions, viz. heaving and pitching due to extreme waves. Forward speed is considered in terms of threshold slamming velocity. Finally limiting condition for slamming load is derived. CFD simulations are performed to obtain the variation of the slamming load along the length of the vessel. Various hull shapes with varying block coefficients, speed and length are considered for slamming load calculations. Results are validated against the rules formulation of bottom impact pressure as given in published classification society rules. Reliable formulation for slamming loads with due consideration of geometry of the vessel, sealceeping characteristics and probability of slamming is achieved for various types of displacement vessels. Application of slamming loads on the vessel for scantling calculations of bottom plating is also discussed.
机译：本文提出了一种经验方法来计算作为船舶前部区域底部冲击压力的撞击载荷。首先，得出船体形状系数与断面死角的关系。相对速度是根据极限运动得​​出的。由于极端波浪起伏和俯仰。根据阈值砰击速度来考虑前进速度。最终得出了冲击载荷的极限条件。执行CFD仿真以获得沿船长方向的砰击载荷变化。计算砰击载荷时，应考虑各种具有不同块系数，速度和长度的船体形状。根据已发布的船级社规则中给出的底部冲击压力的规则公式验证结果。通过适当考虑容器的几何形状，密封爬行特性和发生撞击的可能性，可以对各种类型的容积式容器实现可靠的撞击载荷配方。还讨论了在容器上施加冲击载荷以计算底板的尺寸的问题。

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