构架式可展开天线反射器模块化构型设计优化

Design optimization of modular configuration for deployable truss antenna reflector

针对构架式可展开天线反射器模块化构型要求,基于螺旋理论分析了模块及多模块组网的自由度,采用模块组合思想降低了构架式可展开天线反射器结构设计复杂性。首先,在由四面体单元组成的构架式天线反射器结构基础上,利用3个相同构型的3RR-3RRR四面体单元构建平面模块,再采用模块间花盘与花盘连接方式组网形成构架天线反射器;其次,基于构架式天线反射器的可收展的期望运动,运用螺旋理论验证模块化构架式天线的可展性;最后,针对花盘姿态变化型综合,优化模块间连接运动副,使构架式可展开天线反射器收拢后达到最大收纳比。研究表明模块化构架式可展开天线反射器具有可展性,当模块间采用万向副连接时,组装的二圈模块化天线反射器为8自由度机构且能完全收拢。模块组网后的构架天线反射器具有收纳比高、自由度少的优点,在较少驱动下可使天线展开完全和展开可控,在航天机构领域具有良好的应用性。

For the modular configuration of the deployable truss antenna reflector,the degree of freedom(DOF)of the module and multi-module were analyzed based on the screw theory,and the module combination idea was adopted to reduce the design complexity of deployable antenna reflector.Firstly,the module with a planar working surface was composed of three 3RR-3RRR tetrahedral elements,then the truss antenna reflector was formed by the modules.Secondly,in view of the expected deployable motion of the antenna,the expansibility of the modular truss antenna was verified by the screw theory.Finally,the connecting motion pairs between two modules were designed and optimized to achieve the maximum storage ratio.The research shows that the modular deployable antenna reflector has good expansibility.When the adjacent parts of every two modules are connected with universal joints,the upper or lower disks can be on the same plane,and the antenna reflector can be completely folded with 8 DOFs.After modules networking,the truss antenna reflector has the advantages of high storage ratio and less DOFs,which can be deployed by the motor drivers to realize the controllable deployment,and has good application in the field of aerospace institutions.