| 霍泽凯,王博,周演,郝鹏,徐胜利.面向增材制造的双蒙皮夹层结构加筋拓扑优化方法[J].计算力学学报,2023,40(6):861~871 |
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| 面向增材制造的双蒙皮夹层结构加筋拓扑优化方法 |
| Topology optimization of double-skin stiffened sandwich structure for additive manufacturing |
| 投稿时间：2022-04-25 修订日期：2022-09-28 |
| DOI：10.7511/jslx20220425001 |
| 中文关键词: 薄壁结构 多层级结构 拓扑优化 加筋设计 增材制造 |
| 英文关键词:thin-walled structures hierarchical structure topology optimization stiffener design additive Manufacturing |
| 基金项目:中央高校基本科研业务费(DUT20ZD104);大连理工大学基本科研业务费(DUT2019TD37,DUT21GF201)资助项目. |
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| 中文摘要: |
| 双蒙皮夹层结构是航空航天装备中的特殊承力结构,其典型代表为发动机尾喷管中的同步环构件。近年来,增材制造技术为该类薄壁结构的创新型设计提供了有利条件。但增材制造有其特殊的工艺要求,基于传统拓扑优化得到的设计结果往往存在大量的悬空区域,无法直接应用于增材制造工艺。因此,需要在优化设计阶段统筹考虑结构的力学性能和自支撑工艺约束。针对上述问题,本文提出了一种面向增材制造的双蒙皮夹层薄壁结构加筋拓扑优化方法,可在一次优化中同时得到优化的加筋布局和非均匀点阵分布,从而解决悬空结构的支撑问题,确保优化结果的工艺可达性。为了平衡计算成本和分析精度,本文采用渐进均匀化方法来求解不同类型单胞等效弹性性能,以适应不同复杂单胞构型。基于上述方法,本文给出了某发动机同步环结构的拓扑优化算例,结果表明,本文优化设计方法可以实现双蒙皮夹层结构中夹层加筋和点阵的共同优化,为航空航天装备中发动机同步环结构轻量化设计提供了思路。 |
| 英文摘要: |
| As special load-bearing structures,thin-walled sandwich structures have been widely used in aerospace equipment,such as the synchronization ring structure in an engine tail nozzle.Recently,3D printing of complex thin-walled sandwich structures can be achieved owing to the development of emerging additive manufacturing (AM) technology.However,there are still several process constraints in direct 3D printing of topologically optimized shapes in practical applications.One of the main constraints is that an optimized structure has a large amount of overhanging areas that cannot be manufactured with AM.This paper mainly aims to design double-skin stiffened sandwich structures by combining the topology optimization method and AM which can simultaneously optimize the stiffener layout and the distribution of non-uniform lattice microstructures.Besides,the mechanical performance of the structure and the self-supporting process constraints are considered to solve the overhanging problem.In order to improve the computational efficiency,a novel implementation of the homogenization method is used to solve the equivalent stiffness coefficients for the lattice structures,which can be adapted to different complex lattice configurations.Finally,the synchronous ring engineering structure is taken as an example of topology optimization.The optimization result indicates that the proposed methods in this paper can carry out the concurrent optimization of stiffeners and lattice in the double-skin sandwich structure,which provides a new way to design lightweight aerospace structures. |
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