基于有限元法的小水线面双体船结构优化

小水线面双体船结构复杂,需要有效的工具对其进行优化设计,在满足强度刚度要求的情况下控制结构重量.本文利用优化软件Altair.OptiStruct、Msc.Nastran、iSIGHT对一艘小水线面双体船结构进行了尺寸优化、形状优化、和拓扑优化.结构优化基于有限元法完成,以结构重量作为目标函数,结构应力作为约束条件.优化结果表明,通过选择适当的设计变量,能够在结构应力不超过规定上限的条件下使结构重量显著降低并达到最小值.

Finite element method based structural optimization for SWATH

The structures of Small Waterplane Area Twin Hulls are usually complicated and need to reduce the structural weight by efficient optimum tools. This paper details the application of size, shape and topology optimization techniques to the structural design of a SWATH ship by using software Altair.OptiStruct, Msc.Nastran and iSIGHT.The optimization is based on the results of linear static analysis obtained from the optimum tools' integrated FEA codes. The objective function is defined as structural mass and the constraint function is the maximum nominal stress of structures.The results indicate that these optimal tools are practical and reliable in application, but the key problem is the definition of loads, design spaces and variables which is associated with engineer's design knowledge and experiences.