非对称偏馈环形网状天线索网预张力设计方法  

Pretension design method of the cable network for asymmetric offset-feed mesh reflector antennas

作　　者：范叶森[1] 聂锐[2] 何柏岩[2] 杨癸庚 FAN Yesen;NIE Rui;HE Baiyan;YANG Guigeng(Xi'an Institute of Space Radio Technology,Xi'an 710100,China;School of Mechanical Engineering,Tianjin University,Tianjin 300350,China;School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安空间无线电技术研究所,西安710100 [2]天津大学机械工程学院,天津300350 [3]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《中国空间科学技术》2023年第2期155-164,共10页Chinese Space Science and Technology

基　　金：载人航天预先研究项目(010201)。

摘　　要：提出一种考虑桁架柔性变形对索网平衡态影响的非对称偏馈环形网状天线索网预张力设计方法。该方法将天线整体结构分为内部索网与外部桁架两部分,通过内部索网预张力与外部桁架变形间的不断迭代,寻找满足索网形状及张力要求的天线平衡态,以实现网状天线索网预张力优化配置的目的。相比于常规基于刚性桁架假设的预张力设计,该方法可充分计及环形桁架与柔性索网协调变形,获得高精度反射面,且该方法适用于非对称偏馈天线,可有效避免后期张力调试,节约人力物力。算例分析验证了在进行预张力设计时计及桁架柔性的必要性及方法的正确性和有效性。A pretension design method of the cable network for asymmetric offset-feed mesh reflector antennas considering the influence of the truss flexible deformation on the equilibrium state of cable networks was presented.In this method,the mesh reflector antenna was divided into two parts:the internal cable network and the external truss.Through continuous iterations between the pretension of the cable network and the deformation of the external truss,a set of optimal pretension can be found based on satisfying the equilibrium state of the whole structure.Compared with the conventional pretension design method based on rigid truss assumption,this method can fully consider the compatible deformation between the external truss and the internal cable network to obtain a high surface accuracy reflector.This method can effectively avoid the tension readjustment to save manpower and material resources and applies to the pretension design for asymmetric offset-feed mesh reflector antenna.The case studies illustrate the necessity of considering the truss flexibility in the pretension design and demonstrate the correctness and effectiveness of the proposed method.

关 键 词：环形网状天线 型面精度 桁架变形 索网结构 预张力设计 

分 类 号：V554.3[航空宇航科学与技术—人机与环境工程]