空间可展开薄膜遮光罩设计与分析

对于觅音计划的光学系统而言，太阳光是其杂散光的首要来源，是影响成像质量的重要因素。通过将仿生技术和折纸理论相结合，完成光学系统的遮光罩设计。依据花朵开放过程，获取遮光罩的拓扑构型，完成遮光罩折展设计，并根据光学系统任务需求，优化遮光罩拓扑构型。采用底面为正六边形的拓扑构型时，遮光罩的折展比为8，且折叠后的包络空间和卫星星体所占用的空间相重合，能够更好地利用空间。选用两层薄膜作为遮光结构，一方面提高了遮光性能，另一方面遮光罩本身具有一定的隔热功能，更好地保护了光学系统。最后通过ABAQUS仿真模拟薄膜的展开过程，并进行应力水平分析。结果表明，遮光罩薄膜展开过程顺利，展开后最大应力为40.63MPa，满足聚酰亚胺薄膜材料的使用要求。

Design and analysis of the configuration of deployable membranesunshield#br#

For the optical system of MEAYIN mission, stray light from the sun is one of the most significant factors affecting image quality. Through the combination of bionic technology and origami theory, the deployable membrane sunshield for the optical system was designed. The topological configuration of the sunshield and the design of the folding method of the sunshield were obtained according to the blooming process of the flower, and the topological configuration of the hood was optimized based on the task requirements of the optical system. The topological configuration with a regular hexagon bottom surface was adopted, and therefore the fold out ratio of the membrane sunshield was 8, and the folded envelope space coincided with the space occupied by the satellites which made better use of the space. The choice of two layers of membrane as the shading structure not only improved the shading performance, but also made sure that the sunshield had a certain heat insulation function, which protected the optical system better. Finally, ABAQUS was used to simulate the single layer membrane unfolding process, and the stress level was analyzed. The result shows the unfolding process of the sunshield membrane is smooth, and the maximum stress after deploying is 40.63MPa which is under the stress strength of Kapton membrane.