A Study on Estimation Method of Sloshing Loads on Actual Ship Tanks

船在海浪中以六自由度随机运动。因此，在船舶运动的激励下，船舶储罐内流体的晃动行为应视为一种三维非线性现象，在理性分析中成为一个相当复杂的问题。本文的目的是建立一种合理的估算实际船舱晃动载荷的方法。结论如下：1。提出了一种分析三维晃动问题的方法。该方法引入了一种用摄动展开简化的边界元法算法，并考虑了所有六自由度的船舶运动。利用这种方法，可以分析在规则波或不规则波中前进的船舶油箱内的晃动现象。海浪)。2。提出了一种计算具有随机变量绝对值的非线性响应最大值的概率分布的方法。利用这种方法，可以对充满水的棱柱形储罐壁面所产生的动水压力进行统计预测。以某大型油轮柱面舱的各种数值模拟结果为例，给出了计算的应用实例。2 . .通过对上述计算方法的综合应用，可以估计出实际船舱的晃动载荷。

A ship in sea waves behaves randomly in six degrees of freedom. Therefore, the sloshing behavior of fluids in ship tanks, which is excited by ship motions, should be treated as a three-dimensional and non-linear phenomenon, then it becomes a fairly complicated problem in the rational analysis. It is the purpose of this work to establish a rational method for estimation of the sloshing loads on actual ship tanks. The conclusions are as follows.1. A method is proposed for analysis of a three-dimentional sloshing problem. In this method, an algorithm of the boundary element method which is simplified by use of perturbation expansion is introduced, and all of the ship motions which have six degrees of freedom is considered. Using this method, it is possible to analyze a sloshing phenomenon in tanks on a ship which advances in regular waves or irregular waves(i.e. sea waves).2. A method is proposed for calculations of the probability distribution of the maxima of non-linear response with absolutes of random variables. Using this method, it is possible to make a statistical prediction of the hydrodynamic pressure induced on the walls of the full-filled prismatic tanks.3. The results of various numerical simulations for prismatic tanks on a gigantic oil tanker are illustrated as application examples of the calculations by 1. and 2.. As a result, it is recognized that we can estimate the sloshing loads on actual ship tanks by application of combined use of preceding calculation methods.