基于拓扑优化技术的军用头盔内胆结构三维打印

发布时间：2018-02-26 04:33

本文关键词： 兵器科学与技术数值模拟三维打印军用头盔内胆拓扑优化蜂窝吸能结构　出处：《兵工学报》2017年09期 　论文类型：期刊论文

【摘要】：针对目前军用头盔的轻量化设计问题,提出基于拓扑优化技术的军用头盔内胆轻量化设计方法。利用三维(3D)打印在成型复杂异形结构时的优势,建立具有计算机建模、数值模拟、3D打印以及工程验证的军用头盔内胆结构轻量化设计流程。根据有限元分析法,提出一种基于结构势能最小的拓扑优化算法。设计流程主要包括:通过计算机辅助设计软件对设计对象进行3D建模;使用计算机辅助分析软件Hyper Works中的Hyper Mesh建立有限元模型;通过Hyper Works中的Opti Struct进行拓扑优化设计,查看拓扑优化模型的位移结果,确定设计结构是否满足约束条件。为满足头盔所必须具有的吸能防撞功能需求,在拓扑优化后的头盔内胆基础上,在其侧面加载蜂窝式吸能结构。使用结构优化设计软件solid Thinking Inspire对带有蜂窝式结构的头盔内胆结构进行数值分析验证,模拟真实的头盔佩戴工况,优化前后的von Mises最大等效应力近似一致。对实验模型进行工程受力验证,对比优化前后军用头盔内胆的承受载荷能力。实验结果表明:在满足一定的约束条件和功能需求的情况下,拓扑优化结构可达到轻量化设计的目的,减重效果可达到17.14%,最大承受力达到原始结构的93.72%;同时3D打印技术结合数值模拟可以缩短研发周期,提高制造效率。
[Abstract]:Aiming at the problem of lightweight design of military helmets at present, a lightweight design method for military helmets is proposed based on topology optimization technology. The advantages of 3D printing in shaping complex irregular structures are used to establish computer modeling. Numerical simulation, 3D printing and engineering verification of lightweight design flow for military helmet inner gallbladder structures. Based on finite element analysis, A topology optimization algorithm based on minimum potential energy of structure is proposed. The design process includes: 3D modeling of design object by computer aided design software, building finite element model by Hyper Mesh in computer aided analysis software Hyper Works. Through the Opti Struct in Hyper Works, the topology optimization design is carried out, and the displacement results of the topology optimization model are checked to determine whether the design structure meets the constraint conditions. In order to meet the requirements of the energy absorption and collision prevention function required for the helmet, On the basis of topology optimization, the honeycomb energy absorption structure is loaded on the side of the helmet, and the structural optimization software solid Thinking Inspire is used to verify the structure of the helmet with honeycomb structure. The maximum equivalent stress of von Mises before and after optimization is approximately the same. The experimental model is verified by engineering force. The experimental results show that the topology optimization structure can achieve the purpose of lightweight design under certain constraints and functional requirements. The weight loss effect can reach 17.14 and the maximum bearing capacity can reach 93.72 of the original structure. At the same time 3D printing technology combined with numerical simulation can shorten the research and development cycle and improve manufacturing efficiency.
【作者单位】：北京工业大学激光工程研究院;北京市数字化医疗3D打印工程技术中心;
【基金】：北京市自然科学基金项目(Z140002) 北京市科技创新项目(Z141100002814001)
【分类号】：TJ5;TP391.73;TS941.733

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