This paper aims at finding a proper way to estimate sloshing severity. First, the concept of sloshing severity RAO (SSR) is introduced, and the wave elevation on the liquid free surface is chosen as an initial index for the rough prediction of sloshing severity. Then, compared with experimental data from a 3D regular model test, this index is adjusted and a new index is generated. One step further, sloshing severity under irregular sea states can be achieved by nonlinear combinations of the new index. For validation, the same model tank is tested under a set of irregular sea conditions, and peak pressures and impulse areas are taken as comparison standards. It is found that both numerical and experimental results show a similar tendency of sloshing severity. As a real ship application on the new index, the sloshing severity of a liquefied natural gas floating production storage and offloading (LNG-FPSO) is predicted under a low filling condition. Besides, the ship motion responses with and without sloshing effects are considered for the calculation of severity. From the present observation, this proposed methodology and generated new index is expected to be applicable to the selection of severe sea states for sloshing loads analysis.

中文翻译：

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一种用于晃动严重性评估的实用预筛选方法

本文旨在寻找一种估计晃动严重程度的适当方法。首先，介绍了晃动严重性RAO（SSR）的概念，并选择了无液表面上的波高作为粗略预测晃动严重性的初始指标。然后，与来自3D常规模型测试的实验数据进行比较，对该指数进行调整并生成新的指数。更进一步，可以通过新指标的非线性组合来实现不规则海况下的晃动严重性。为了进行验证，同一模型的油箱在一组不规则的海况下进行了测试，并且将峰值压力和冲击面积作为比较标准。发现数值和实验结果都显示出类似的晃动严重性趋势。作为新索引上的实际船舶应用，预测在低填充条件下液化天然气浮动产品的存储和卸载（LNG-FPSO）的晃动严重性。此外，考虑带有和不带有晃荡效应的船舶运动响应来计算严重性。从目前的观察来看，这种拟议的方法和产生的新指​​标有望适用于针对晃荡载荷分析的严峻海况的选择。