独立B型LNG船液舱晃荡强度分析方法

摘要

为了保证液舱舱容大且无装载限制的新型独立B型LNG船在晃荡载荷下的强度满足使用要求,提出液舱结构晃荡强度直接分析方法.采用规范公式确定液舱晃荡载荷,根据该方法对液舱模型进行粗网格分析,进行典型区域横摇工况下超出应力许用值的精细网格分析.结果表明,该方法可以对独立液舱晃荡强度进行有效评估,其中的精细网格计算结果可真实反映高应力梯度区域的应力情况.分析结果可为液舱晃荡强度评估、液舱结构优化以及同类LNG船的设计开发提供参考.%In order to ensure that the sloshing strength of the new independent type B tanks in LNG ship with largeca-pacity and free loading limit meets the requirements, a new direct analysis method for the sloshing strength assessment of the tank is proposed. Sloshing loads were calculated according to formulas recommended in rules. The coarse gird analysis of the tank was carried out according to the direct calculation method. Then the region which exceeded the allowable stress was filtered and fine mesh analysis on the target region in rolling condition was done. The result shows that the method can be used to evaluate the sloshing strength of the independent tank effectively, and the result of the fine mesh calculation canre-flect the stresses distribution state of the high stress gradient region truly. The analysis results can provide reference for the evaluation of the tank sloshing strength, optimization of the tank structure and further design of the similar LNG ships.