| 摘要: |
| 结构的轻量化设计在航天工程中具有重要意义，增材制造与点阵结构的结合可有效实现航天器结构的轻量化。提出了面向增材制造蒙皮点阵结构的设计方法，该方法通过拓扑优化与蒙皮点阵填充，在保证结构刚度的情况下实现结构减重，基于蒙皮边界位置点阵胞元的八叉树细化实现蒙皮点阵结构的自支撑。采用提出的设计方法针对航天器惯组梁结构开展了轻量化设计研究，实现了结构减重超过40%。通过激光选区熔化工艺制备了新型自支撑蒙皮点阵惯组梁结构，仿真分析与试验结果表明,新型蒙皮点阵结构相较传统惯组梁结构在大幅减重的同时表现出更优的刚度特性。研究提出的增材制造自支撑蒙皮点阵设计方法为航天器结构的轻量化设计提供了新的技术途径。 |
| 关键词: 增材制造 蒙皮点阵结构 轻量化设计 自支撑设计 |
| DOI： |
|
| 基金项目:国家自然科学基金（12122202，12302078，U22B2083） |
|
| Design Method and Application Investigation of Additive-Manufactured Self-Lattice-Infilled Structure |
| DUAN Shengyu,XIE Jinxin,SHI Yuhong,LIU Bin,LEI Hongshuai |
| (Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China;Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China) |
| Abstract: |
| The lightweight design of structure is of great significance in aerospace engineering. The combination of additive manufacturing and lattice structure is an important way to realize the lightweight of spacecraft structure. In this study, a novel design method of lattice-infilled structure for additive manufacturing is proposed. The weight reduction of the structure is achieved by topology optimization and lattice filling under the condition of ensuring the structural stiffness, and the octree refinement based on the lattice cell of shell boundary position is proposed to realize the self-supporting of lattice-infill structure. The proposed design method is used to carry out the lightweight design research on the beam structure of spacecraft inertial navigation unit, and the weight reduction of the structure is more than 40%. The novel self-lattice-infill beam structure was fabricated by additive manufacturing. The numerical analysis and experimental results show that the lattice-infill structure shows better stiffness characteristics than the conventional beam structure. The design method proposed in this study provides a new technical approach for lightweight design of spacecraft structures. |
| Key words: Additive manufacturing Lattice-infilled structure Lightweight design Self-supporting design |