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为解决超大口径可展开天线机构的轻量化、高刚度设计问题,提出一种由弹性铰链驱动的双层环形可展开天线机构.建立天线结构的静力学分析模型,得出结构中杆件与拉索的相互影响关系,推导出对角拉索预紧力的取值范围.基于建立的双层环形可展开天线结构动力学分析模型,对比分析前6阶振动频率及其相应的模态振型,与无拉索相比,通过对角斜拉索刚化可以将结构刚度提高1.2倍.分析结构参数对结构振动频率的影响规律,基于振动频率影响因素的灵敏度分析,得出增加双层环形可展开天线机构中的横杆截面面积和斜拉索的截面积,减小纵杆截面面积是提高双层天线结构振动频率的有效措施.
In order to solve the problem of lightweight and high rigidity design of the large aperture expandable antenna, a double annular ring expandable antenna mechanism driven by elastic hinges is proposed.The statics analysis model of the antenna structure is established, The relationship between the prestress force of diagonal cable is deduced.According to the established dynamic analysis model of double annular deployable antenna structure, the comparative analysis of the first 6 order vibration frequencies and their corresponding mode shapes , Compared with no cable, the stiffness of diagonal cable can be increased by 1.2 times .Analysis of the influence of structure parameters on the vibration frequency of the structure, based on the sensitivity analysis of the influence factors of vibration frequency, It is effective to expand the cross-sectional area of the crossbar and the cross-sectional area of the diagonal cable in the antenna mechanism and to reduce the cross-sectional area of the longitudinal rod to increase the vibration frequency of the double-layer antenna structure.