基于折纸的大型空间薄膜遮阳结构设计与分析

Design and Analysis of Large Space Membrane Sunshield Structure Based on Origami

提出了一种轻质、展开顺畅、收纳比高且不需要额外驱动动力的新型自展开薄膜遮阳结构。利用4根等长的带状弹簧驱动叶内环绕折叠的聚酰亚胺薄膜,并计算了收纳比。为了防止薄膜在展开过程中出现钩挂和破损的问题,对薄膜展开的轨迹、薄膜的应力分布以及带状弹簧骨架的模态分布进行了有限元仿真,并制作了测试样机以验证设计的可行性。结果显示,利用带状弹簧驱动薄膜展开,展开过程顺利,带状弹簧展开时的冲击不会造成薄膜损伤,薄膜折痕处的最大应力约为42.3 MPa,低于材料的许用应力,且收纳比达到了69.4。

This paper proposes a self-deploying membrane sunshield structure to satisfy the requirements of lightweight,easy unfolding with high expansion ratio,and not requiring the driving power.Four equal length tape springs are used to unfold the Kapton membrane folded with leaf-in and circumferential and the folding ratio is calculated.In order to prevent the problems of hook and damage during the unfolding process,stress and trajectories of the membrane as well as the tape spring modal distribution of the skeleton are analyzed.Finally,a test prototype completes to verify the feasibility of the designment.The results show that by applying the tape springs as the driving method,the membrane unfolding process is smooth,and the membrane will not be damaged.The maximum stress at the membrane crease is about 42.3 MPa which is lower than the allowable stress of the material and the folding ratio reaches 69.4.