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大型环形桁架天线结构由大量的杆件及铰链构成,环形桁架为天线结构的骨架,为天线反射型面的形成提供可靠的支撑.由于结构中存在大量的铰链,在制造及装配等过程中铰链的间隙不可避免,而铰链的动刚度系数对铰链的动力学特性有着重要影响,因此有必要对铰链的动刚度进行研究.本文对大型可展空间环形桁架天线结构间隙铰链的动刚度问题进行了理论与实验分析.建立了铰链动刚度的模型,分析了外激励、铰链间隙及铰链振动幅值对动刚度系数的影响.结果表明,间隙对动刚度系数的影响较为显著,随着间隙的增大,铰链的动刚度系数将会降低.同时,通过实验分析,验证了理论模型的正确性.
Large ring truss antenna structure consists of a large number of rods and hinges, the annular truss for the antenna structure of the skeleton, for the formation of the antenna reflection profile to provide reliable support due to the structure of a large number of hinges, in the manufacturing and assembly process hinges The dynamic stiffness of the hinges has an important influence on the dynamic characteristics of the hinges, so it is necessary to study the dynamic stiffness of the hinges.In this paper, the dynamic stiffness of the gap hinges in large deployable space truss antenna structures are studied Theoretical and experimental analysis.A model of the dynamic stiffness of the hinge is established and the influence of the external excitation, the hinge clearance and the vibration amplitude of the hinge on the dynamic stiffness coefficient are analyzed.The results show that the influence of the clearance on the dynamic stiffness coefficient is significant, The dynamic stiffness coefficient of large hinge will be reduced.At the same time, the correctness of the theoretical model is verified through experimental analysis.