The increasing scarcity of orbit resources has directed the focus onto the versatility of space antennas. Through shape reconfiguration, large antennas can achieve enhanced task compliance. In this paper, a two-degree-of-freedom (DOF) deployable support truss with shape reconfiguration is designed for parabolic cylindrical antennas. A design strategy is presented for the support truss, in which the synchronous deployment is realized first through the expansion of basic deployable units. The branch chains are then supplemented to realize the controllable reconfiguration of the entire support truss. Moreover, the mobility and kinematic analyses of the basic modules on the support truss are conducted to parametrically analyze the DOF space and realize the expected reconfiguration. The unit number and structure parameters of the support truss can influence the mimicking preciseness. To fulfill the mimicking error requirement with a more concise mechanism, a parameter optimization method based on the genetic algorithm is proposed to achieve the minimum number of the required deployable units. Simulation of the deployment and reconfiguration of the support truss as well as the verification test conducted on the principle prototype demonstrate the feasibility of the mechanism design. This paper may provide candidates for support trusses of large reconfigurable antennas with enhanced task flexibility and efficiency, and serve as references for the design of deployable mechanisms with the reconfiguration function.

中文翻译：

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用于具有形状重构功能的抛物面圆柱天线的可展开支撑桁架


轨道资源的日益稀缺已将焦点转向空间天线的多功能性。通过形状重新配置，大型天线可以实现增强的任务合规性。在本文中，为抛物面圆柱天线设计了一种具有形状重构功能的二自由度（DOF）可展开支撑桁架。提出了支撑桁架的设计策略，首先通过基本可展开单元的扩展实现同步展开。然后补充分支链，实现整个支撑桁架的可控重构。此外，对支撑桁架上的基本模块进行可动性和运动学分析，对自由度空间进行参数化分析，实现预期的重构。支撑桁架的单元数量和结构参数会影响模仿精度。为了以更简洁的机制满足模仿误差要求，提出了一种基于遗传算法的参数优化方法，以实现所需可部署单元的最少数量。支撑桁架的展开和重构仿真以及原理样机的验证试验证明了机构设计的可行性。本文可为具有增强任务灵活性和效率的大型可重构天线支撑桁架提供候选，并为具有重构功能的可展开机构的设计提供参考。