可展天线的柔性索网结构找形分析方法  

A Method of Form-finding Analysis for Flexible Cable Net Structures of Deployable Antennas

作　　者：李团结[1] 周懋花[1] 段宝岩[1] 

机构地区：[1]西安电子科技大学机电工程学院,西安710071

出　　处：《宇航学报》2008年第3期794-798,共5页Journal of Astronautics

基　　金：装备预研项目(51321040102)

摘　　要：给出了可展天线柔性索网结构形态分析的一种优化方法。在满足索网形面精度的条件下,用小三角形网格单元拟合反射面抛物曲面,生成索网结构的网格。以索网结构的网面精度为目标函数,以索网单元预张力值为设计变量,以索网松驰面积、强度和应力分布均匀性为约束条件,提出了基于遗传算法和有限元分析相结合的找形分析优化方法,将索网找形转变成一个带约束的最小化问题。对可展天线中常用的三种三向索网结构进行了找形分析,结果表明此优化找形方法是可行的,可应用于工程中其他索网结构的形态分析。An optimization method for the shape - state analysis of cable net structures in deployable antennas is presented. The cable net structure, which used a triangulated cable network to approximate the reflecting surface under conditions of higher surface accuracy, was generated. The surface accuracy of the cable nets was chosen as objective function, the pre-tension forces in cables as design variables, and the relaxing area, strength and the adequate prestress distributions as constraint conditions, an optimization method to the form-finding was proposed based on the genetic algorithm and finite element analysis, which turned the form-finding of the cable nets into a constrained minimization problem. The method was applied to the form-finding of three types of triangular nets commonly used in deployable antennas. Results shows the feasibility of the form-finding method, which can be applied to the form-finding analysis of the other cable nets.

关 键 词：柔性索网 找形 有限元分析 可展天线 

分 类 号：TU351[建筑科学—结构工程] V414[航空宇航科学与技术—航空宇航推进理论与工程]