Wang Xianjie, Zhang Fan, Zhao Yang, Wang Zhaoyi, Zhou Guangen
Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia University of Technology, Hohhot 010051, China.
School of Architecture and Planning, Yunnan University, Kunming 650106, China.
Materials (Basel). 2022 May 29;15(11):3874. doi: 10.3390/ma15113874.
Designing a high-strength node is significant for space structures. Topological optimization can optimally allocate the material distribution of components to meet performance requirements. Although the material distribution after topology optimization is optimum, the structure becomes complicated to manufacture. By using additive manufacturing technology, this problem can be well solved. At present, both topology optimization technology and additive manufacturing technology are quite mature, but their application in the design of spatial nodes is very recent and less researched. This paper involves the study and improvement of the node optimization design-manufacturing integrated method. This study used the BESO optimization algorithm as the research algorithm. Through a reasonable improvement of the material interpolation method, the algorithm's dependence on the experience of selecting the material penalty index P was reduced. On this basis, the secondary development was carried out, and a multisoftware integration was carried out for optimization and manufacturing. The spatial node was taken as the research object, and the calculation results of the commercial finite element software were compared. The comparison showed that the algorithm used in this paper was better. Not only was it not trapped in a local optimum, but the maximum stress was also lower. In addition, this paper proposed a practical finite element geometric model extraction method and smoothing of the optimized nodes, completing the experiment of the additive manufacturing forming of the nodes. It provides ideas for processing jagged edges brought by the BESO algorithm. This paper verified the feasibility of the multisoftware integration method of optimized manufacturing.
设计高强度节点对空间结构具有重要意义。拓扑优化可以优化部件的材料分布以满足性能要求。尽管拓扑优化后的材料分布是最优的，但结构制造起来变得复杂。通过使用增材制造技术，这个问题可以得到很好的解决。目前，拓扑优化技术和增材制造技术都相当成熟，但它们在空间节点设计中的应用非常新且研究较少。本文涉及节点优化设计 - 制造集成方法的研究与改进。本研究使用BESO优化算法作为研究算法。通过对材料插值方法进行合理改进，降低了算法对选择材料惩罚指数P的经验的依赖。在此基础上，进行了二次开发，并进行了多软件集成以进行优化和制造。以空间节点为研究对象，比较了商业有限元软件的计算结果。比较表明本文使用的算法更好。它不仅没有陷入局部最优，而且最大应力也更低。此外，本文提出了一种实用的有限元几何模型提取方法以及对优化节点的平滑处理，完成了节点的增材制造成型实验。它为处理BESO算法带来的锯齿状边缘提供了思路。本文验证了优化制造的多软件集成方法的可行性。
