Abstract: 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.

Key words: sunshield, membrane structure, bionics, configuration optimization, deployable process