充气可展天线精度分析和形面调整

充气可展天线结构是以柔性薄膜材料制造的一种新型可展天线.对一类充气可展开天线系统进行结构设计,并相应地建立了充气结构的有限元分析模型.对充气反射面进行了精度分析,研究各参数对形面精度的影响,包括内压、膜材厚度、材料属性、天线焦距等;比较了3种实验姿态下重力对形面的影响,选择其中一种能够很好地模拟失重环境;针对特定的天线结构系统,提出了可行的形面调整新方法.分析和实验表明,调整方法能够有效提高形面精度.

Precision Analysis and Shape Adjustment of Inflatable Antenna

Inflatable antenna structures made of flexible membrane materials have many benefits over machine deployable antenna: low in mass and can be packaged into small volumes and are easy to control the deploy process. A kind of ground demonstration model of lenticular membrane antenna was designed in this paper, and nonlinear finite-element analyz model of inflatable structures is built. Precision analyses of inflatable reflector were conducted, and all important design parameters such as inflation pressure, membrane thickness, material characteristics and antenna focal length are investigated. The parametric study results were then used to design a 2-meter ground demonstration model of lenticular membrane antenna. The demonstration antenna reflector model was assembled by twelve gores from 0.18-mm-thick Mylar films. Gravity influence in the reflector was compared under three postures and one of them is chosen as final experiment posture. For this antenna structure, a new feasible shape adjustment measure was improved based on surface accuracy test of the membrane antenna reflector. Analysis and experiment results indicate that this method can improve the inflatable reflector precision effectively.