摘要
掌握各种参数对大型天线固有模态的影响规律是减小质量、提高刚度的重要依据。本文将径射状可展桁架与金属细丝编织索网结合,形成了10米口径的大型天线反射器;采用杆单元与索单元,建立了天线反射器的有限元模型;利用ANSYS软件,对5种天线结构的固有频率与质量进行了对比分析,得出了采用12支径向桁架、每支5个单元机构的结构最优的结论。研究了铰链质量、缆绳截面大小、索网初拉力等参数对天线固有频率的影响规律,为天线结构的动力学研究以及结构的进一步优化设计提供了理论基础。
It is important to know the regulation that various parameter affect natural modal of space antenna According to the influencing regulation , quality can be reduced and rigidity can be improved. The thesis sets up a large space antenna with 10 meters caliber, which combination deployable truss with metallic cable-net. Adopting beam4 and link lO of ANSYS, a finite element model for reflectible device of space antenna is established. The natural modal analysis and quality contrast for five kinds space antenna are accomplished by Finite Element Method. The conclusion is maken that the structure of twenty trusses and five units with each truss is the best. The thesis studies how do the quality of gemel, the section of cable and the initial strain of cable-net influence the natural modal of space antenna The results supply a theoretical foundation for optimization design of space antenna structure and dynamics study of space antenna structure.
出处
《机械设计与制造》
北大核心
2007年第5期174-176,共3页
Machinery Design & Manufacture
关键词
大型天线
模态分析
结构动力学
有限元分析
Large space antenna
Modal analysis
Structure dynamics
Finite element method（FEM）
