针对可折叠展开式伞状龙骨聚光器具有自重低、功率高、比冲高、推力适中的特点, 利用ANSYS和ZEMAX软件对功率为100 kW的可折叠展开式伞状龙骨聚光器在太空环境中的聚光性能进行模拟分析。在太阳风及衬底薄膜表面张力的影响下, 伞面最大应力为1.66 MPa, 远小于Kevlar材料及Ti-6Al-4V龙骨材料的阈值强度, 伞面最大形变仅为0.941 mm, 焦斑半径为6.37 cm, 几何聚光比可达5 917, 比标准抛物面仅减小了1.25%。结果表明：将材质轻、抗拉伸强度高的伞状龙骨结构引入可折叠展开式聚光器的设计方案, 在很大程度上抵消了衬底薄膜材料表面张力及太阳风对聚光器工作形态的影响, 可消除褶皱, 提高可折叠展开式伞状龙骨聚光器的结构稳定性及可展开度, 同时证明了伞状龙骨结构及Kevlar材料的选择是合理的。

In order to improve the concentration efficiency and eliminate the optical aberration, the umbrella-shaped keel structure has been introduced into the deployable concentrator. The concentration performance of deployable solar paraboloid concentrator with concentration power of 100 kW working in the space environment has been investigated with the software ANSYS and ZEMAX. Under the influence of film tension and solar wind, the maximum stress of umbrella fabric is 1.66 MPa, which is much smaller than the threshold intensity of Kevlar and Ti-6Al-4V keel materials. The maximum deformation of umbrella fabric is 0.941 mm, the radius of the spot size is 6.37 cm, and the geometric concentration ratio can achieve 5 917, only 1.25% lower than the ratio of the standard parabolic concentrator. The results reveal that the influence of film tension and solar wind on the working shape of concentrator can be offset to a large extent by the introduction of the umbrella-shaped keel structure, which could eliminate wrinkles and enhance the deployability and stability of umbrella-shaped keel concentrator. The selected umbrella-shaped keel structure and Kevlar materials are proved to be appropriate.