展开式薄膜遮光罩设计及重复展开精度研究

针对星敏感器的杂光抑制需求，设计了一种可以实现轴向展开的圆柱状展开式薄膜遮光罩，包括充气支撑管、薄膜蒙皮和挡光环，并完成了各构件的结构和材料设计。建立了薄膜蒙皮的运动学模型，分析了构型随着二面角的变化情况，验证了薄膜蒙皮采用hexagonal折纸样式可以完全折叠和展开。通过试验研究了遮光罩的重复展开精度，包括轴向和径向展开精度等。研制了遮光罩原理样机，并开展了地面展开试验，表明在充气支撑管的驱动下能够顺利展开，为大尺寸遮光罩的工程应用提供了新的技术方案。

Study on design and repetitive deployment precision of deployable membrane sunshields

To suppress stray light from the star sensor,a cylindrical deployable membrane sunshield with axial expansion was designed,including inflatable support tubes,membrane skin and vanes.The structure and material design of each component were completed.Kinematic analysis model of the membrane skin was established,and the variation process of the configurations with the dihedral angle was analyzed.The membrane skin can be folded and deployed completely by hexagonal origami pattern.The repetitive deployment precision of the sunshield was studied by experiments,including the axial and radial precision.The prototype model of the sunshield was developed,and the ground deployment test was carried out.Results showed that the sunshield was successfully deployed under the drive of the inflatable support tubes.The work provides a new technical scheme for the engineering application of large size sunshields.