Airmesh金属增材制造节点的拓扑优化

Topology optimization of metal additive manufactured nodes of Airmesh

空间结构的节点兼具受力和美观双重功能,因此节点的优化十分重要.拓扑优化得到的节点形态不规则且复杂,难以采用传统方法制造,而金属增材制造(金属3D打印)技术为复杂节点的制造提供了可能性.以采用金属增材制造节点的空间杆系结构Airmesh为对象,对其代表性节点进行了单工况和多工况的拓扑优化.以最小化质量为目标,分析体积分数约束对拓扑形态的影响,以获得最优的拓扑形态;对得到的节点形态进行平滑化处理等重建模工作;最后通过有限元分析检验优化后节点的受力性能.

The nodes of a spatial structure must satisfy both mechanical and aesthetic requirements, arousing the need for optimization. The nodal geometry resulted from topology optimization is often irregular and complex, thus, it is difficult to be manufactured using traditional methods. The advent of metal additive manufacturing(metal 3 D printing) technology provides a promising alternative to tackle this issue. In this paper, nodal topology optimization is performed on Airmesh, a spatial truss structure with all its nodes being metal additive manufactured, under single and multiple loading cases. The optimization objective was set to be minimum weight with the effect of volume fraction on the resulting nodal geometry. It is analyzed to obtain the optimal topological morphology. The obtained nodal geometry is slightly adjusted to include local smoothening to complete the optimization process. Finally, the mechanical performance of the optimized nodes is examined through a finite element analysis.