晃荡载荷作用下LNG船B型独立液货舱支撑结构受力分析

Force analysis of support structure of LNG independent Type B tank under sloshing loads

为分析LNG船B型独立液货舱的支撑结构在晃荡载荷作用下的受力情况,建立二维有限元模型,简化支撑结构,基于任意拉格朗日-欧拉方法和体积模量缩减技术,采用Abaqus对液舱晃荡进行数值仿真,得到不同工况下支撑结构作用力随时间的变化情况。有结论以下:1)周期性横摇使支撑结构作用力周期性变化;2)横摇幅值越大,作用力变化范围越大;3)与固体货物相比,装载等密度等体积液体货物时,作用力变化范围更大;4)在液货舱内设置挡板能够降低作用力变化范围。本文采用的计算方法和得到的结论能够为初步设计阶段支撑结构的强度及疲劳分析提供帮助。

To conduct the force analysis of the support structure of LNG independent Type B tank under sloshing loads,a two-dimensional finite element model with simplified support structure was established.The Abaqus was used to simulate the sloshing and calculate the force of the support structure under different cases based on arbitrary Lagrangian-Eulerian method and bulk modulus reduction technique.The following conclusions are drawn:1.the periodic rolling motion results in the periodic support structure force;2.the larger the rolling amplitude,the greater the range of the force variation;3.in the same density and volume,the range of force variation caused by liquid cargo is greater than solid cargo;4.the baffles in the cargo tank can reduce the range of force variation.The numerical methods and conclusions in this paper can contribute to the strength and fatigue analysis of the support structure during the preliminary design phase.