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研究目的:为了实现重量轻、驱动方式简单的可展天线,提出了基于复合材料的双向可展开、收拢的新型柱状抛物面天线。从几何分析、基频测试与理论计算等方面论证了该结构形式的可行性,为进一步的应用打下了基础。创新要点:基于剑桥大学提出的Deployable Support Structure,将反射面分成两块实现横向折叠,进一步减小收拢状态下的体积;采用非接触式方法进行了基频测试,提出了增加结构展开后刚度的几种方法,结果表明增加侧板和采用large curved tape springs作为边框的方式能够有效增加结构刚度。研究方法:制作了天线缩比模型,验证了收拢与展开过程;采用非接触式摄影测量法进行了基频测试;采用有限元方法进行了基频分析、动力响应分析和静力分析;同时初步分析了电性能。重要结论:本文实现了一种低重量、低成本的双向可展柱状抛物面天线结构形式,能够实现较小的收纳体积;文中提出的加固方案能够有效提高结构的基频。非接触式测量方法对于这类频率较低的柔性结构是可行的。
Research purposes: In order to achieve a lightweight, easy-to-drive extendible antenna, a novel cylindrical parabolic antenna based on composite materials is proposed, which can expand and contract in both directions. The feasibility of the structural form is demonstrated from the aspects of geometric analysis, fundamental frequency test and theoretical calculation, laying the foundation for further application. Innovative points: Based on the Deployable Support Structure proposed by the University of Cambridge, the reflective surface is divided into two to achieve lateral folding to further reduce the volume in the folded state. The non-contact method was used to conduct the fundamental frequency test, Several methods, the results show that the increase in the side panels and the use of large curved tape springs as a border method can effectively increase the structural rigidity. Research methods: Antenna shrinkage ratio model was made to verify the process of collapse and expansion; Non-contact photogrammetry was used to carry out the fundamental frequency test; The fundamental frequency analysis, dynamic response analysis and static analysis were carried out by finite element method; The electrical properties were analyzed. Important Conclusions: This paper presents a low-weight, low-cost two-way parabolic antenna structure that can achieve a smaller storage volume. The proposed reinforcement scheme can effectively improve the fundamental frequency of the structure. Non-contact measurement method for such a lower frequency of flexible structure is feasible.