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 large capacity 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 can reflect 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.
2017,39(9): 59-63,73 收稿日期：2017-01-05
DOI：10.3404/j.issn.1672-7649.2017.09.012
分类号：U661.1
基金项目：工信部重大专项资助项目
作者简介：张明娟(1992-),女,硕士研究生,研究方向为船舶与海洋工程结构力学
参考文献：
[1] 王德禹. 液化天然气船液舱的晃荡[J]. 计算机辅助工程, 2010, 19(3):1-4. WANG De-yu. Sloshing of the tank in liquefied natural gas tank[J]. Computer Aided Engineering, 2010, 19(3):1-4.
[2] 黄鹏程. LNG船舶特性及其管理的思考[J]. 航海技术, 2006, 5(5):44-46. HUANG Peng-cheng. Characteristics and management consideration of LNG ships[J]. Marine Technology, 2006, 5(5):44-46.
[3] 刘文夫, 薛鸿祥, 唐文勇, 等. 独立B型LNG棱型液舱晃荡载荷数值分析[J]. 船舶工程, 2015, 37(7):22-25. LIU Wen-fu, XUE Hong-xiang, TANG Wen-yong, et al. Sloshing loads analysis of LNG carrier with independent type B prismatic tanks[J]. Ship Engineering, 2015, 37(7):22-25.
[4] 陈潜, 刘俊, 唐文勇. 独立B型LNG船液舱结构晃荡强度研究[J]. 舰船科学技术, 2015, 37(9):12-15. CHEN Qian, LIU Jun, TANG Wen-yong. Research on strength analysis of LNG ship with independent type B tanks under sloshing load[J]. Ship Science and Technology, 2015, 37(9):12-15.
[5] 王元, 王德禹. 考虑晃荡效应的独立B型LNG液舱结构多目标优化[J]. 海洋工程, 2016, 34(2):87-94. WANG Yuan, WANG De-yu. Structural multi-objective optimization of SPB LNG tanks under sloshing pressure[J]. The Ocean Engineering, 2016, 34(2):87-94.
[6] 散装运输液化气体船舶构造与设备规范[M]. CCS, 2014. Rules for construction and equipment of ships carrying liquefied gases in bulk[M]. CCS, 2014.
[7] 朱仁庆, 吴有生. 液舱内流体晃荡特性数值研究[J]. 中国造船, 2002, 43(2):15-21. ZHU Ren-qing, WU You-sheng. A numerical study on sloshing phenomena in a liquid tank[J]. Shipbuilding of China, 2002, 43(2):15-21.
[8] DNV(DET NORSKE VERITAS). RULES For Strength Analysis of Liquefied Gas Carriers with Independent Type B Prismatic Tanks[M].
