考虑晃荡效应的独立B型LNG液舱结构多目标优化  

Structural multi-objective optimization of SPB LNG tanks under sloshing pressure

作　　者：王元[1,2] 王德禹[1,2] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《海洋工程》2016年第2期88-94,共7页The Ocean Engineering

基　　金：教育部;财政部"船舶数字化智能设计系统"资助项目(201335)

摘　　要：独立B型LNG液舱内部设置舱壁板材及多种桁材,有效缓解了液舱晃荡效应。针对晃荡载荷下的独立B型LNG液舱结构多目标优化,利用规范中的公式计算晃荡载荷,并引入液舱晃荡系数,以期综合反映液舱内部构件对晃荡特性的影响,在此基础上进一步建立以液舱结构重量和液舱晃荡系数为目标的多目标优化模型,采用多目标遗传算法(NCGA),计算得到改进的独立B型LNG液舱结构设计方案。SPB （Self-supporting Prismatic-shape type B） LNG tanks are designed with internal bulkheads and girders to reduce liquid sloshing resonances in the tanks. The present research aims to give a structural multi-objective optimization for the SPB LNG tanks under sloshing pressure. Sloshing loads are calculated according to formulas recommended in rules. Sloshing coefficient, which is related to internal girders of tanks, is defined and introduced as one of the objectives combined with tank weight. The structural multi-objective optimization model of SPB LNG tank is established and performed based on NCGA algorithm. Numerical results show that an improved scantling design of SPB LNG tanks is achieved.

关 键 词：独立B型LNG液舱 晃荡效应 多目标优化 多目标遗传算法 

分 类 号：U662.2[交通运输工程—船舶及航道工程]