摘要
针对具有大尺度抛物柱状反射面需求的空间可展开天线,提出一种基于四棱柱折展模块的构架式可展开抛物柱面网状天线,依靠模块驱动组件实现天线联动展开。把抛物面天线工作表面的拟合方法拓展到抛物柱面天线,采用工作面拟合圆均等网格划分径向投影获取天线支撑桁架设计的关键节点。柔性网状反射面采用双层索网结构形式,提出与前索具有较好对称性的背索网悬链线设计,前、后索网节点由支撑立柱间拟合圆弧均等分径向分别投影到抛物线段和悬链线圆弧上获取,根据前后索网节点建立索网拓扑构型,基于非线性有限元法对索网预张力进行设计迭代,获得抛物线维索网预张力与其均值的最大误差率为12.3%及柱面维索网预张力与其均值的最大误差率为7.6%的优化结果。研制了机械口径12 m×12 m样机,多次展开获得2 mm RMS以内的形面精度,验证了构架式可展开抛物柱面网状天线较优的展开性能和形面精度保持性能。
For the requirement of the space-used large-size cylindrical working surface, a deployable parabolic cylindrical truss-mesh antenna reflector constructed by quadrangular prism modular was proposed.The deploying and folding process of the parabolic cylindrical truss-mesh antenna reflector was realized by the driving assembly of the modular truss.The fitting method of parabolic working surface was extended to the parabolic cylindrical surface.The key design nodes of the support deployable struts were obtained by the radial projection of the uniform distributed nodes in the fitting circle.The front net nodes in the parabolic curve and the rear net nodes in the proposed catenary were obtained by the same method.Based on the front net nodes and rear net nodes, topological configuration of the parabolic cylindrical cable-nets was constructed.The pre-tension optimization design was performed by using the no-linear element method.The optimization results indicate that the maximum error ratio of pre-tension in the parabolic direction to its average value was 12.3% and the maximum error ratio of pre-tension in the cylindrical direction to its average value was 7.6%.Finally, a prototype with the size of 12 m×12 m was developed.Deployment tests and shape measurements were performed, and the parabolic cylindrical surface errors were tested within 2mm RMS.The results show that the proposed deployable parabolic cylindrical truss-mesh antenna reflector has excellent deploying performance and a high surface precision.
作者
王晓凯
李向华
杜江华
刘天明
钟汉田
陈传志
李明
周鑫
WANG Xiaokai;LI Xianghua;DU Jianghua;LIU Tianming;ZHONG Hantian;Chen Chuanzhi;LI Ming;ZHOU Xin(Aerospace System Engineering Shanghai,Shanghai 201109,China;Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《中国空间科学技术》
CSCD
北大核心
2023年第1期139-145,共7页
Chinese Space Science and Technology
基金
国家自然科学基金(52075242)
中国航天科技集团有限公司青年拔尖人才支持工程(YF-ZZYF-2021-207)。
关键词
可展开天线
抛物柱面
结构设计
索网结构
形面误差拟合
deployable antenna
parabolic cylindrical
structural design
cable-net
surface error fitting
