油船货舱结构拓扑优化工程应用

Engineering application of topology optimization in structural design for cargo tank region of oil tanker

基于双向渐进结构优化方法,采用自编程的形式,结合成熟的有限元计算处理程序,对某型油船货舱船体横向强框架和水平桁进行了拓扑优化设计;并提出一套适用于复杂船体结构拓扑优化设计流程,包括船体结构的拓扑优化基结构合理选取以及多工况下油船货舱结构拓扑优化的加权系数的选取方式等。最终提取得到了合理且原创的拓扑构型,并将其成功地应用到新船型结构设计之中,使新船型的横向强框相较传统油船重量减轻28.6%,单位长度内货舱区结构的重量减轻5.4%。

Based on the bi-directional evolutionary structural optimization(BESO) method, a topology optimization is applied to the transverse webs and horizontal girders of one oil tanker with a self-programming method which combines BESO and commercial FEM software in this article. Besides, a topology optimization based ship structural design procedure is provided, which includes the selection method for topology optimization design base and treatment of multi-loading conditions with weight factors. In the end, the reasonable and original topology configurations are extracted out and transformed into a new ship structural design, whose transverse web frame's weight is reduced by 28.6%, and whose structural weight of cargo tank region's per unit length is reduced by 5.4% compared with the traditional design.