Optimization design method for mesh reflector antennas considering the truss deformation and thermal effects
Optimization design method for mesh reflector antennas considering the truss deformation and thermal effects
复制标题
考虑桁架变形和热效应的网状反射面天线优化设计方法
DOI：
10.1016/j.engstruct.2020.110253
复制
发表时间：
2020-04-01
影响因子：
5.5
通讯作者：
Ma, Xiaofei
中科院分区：
文献类型：
--
作者：
Nie, Rui;He, Baiyan;Ma, Xiaofei
网状反射面天线在未来先进的卫星通信和广播系统、对地观测、陆地遥感、深空探测和空间通信系统中发挥着重要的作用。网格面的形状在很大程度上取决于索力，反之亦然。因此，对有线电视网络进行找形和优化设计是非常重要的。然而，目前的设计方法是在环境温度下进行优化设计，忽略了空间热环境中热变形引起的形状误差。主动在轨调形技术在实际应用中受到在轨测量和控制技术的制约。目前的发射前初步平差只考虑了索网的热影响，忽略了桁架弹性变形和热变形对表面精度的影响。本文提出了一种网状反射面天线的优化设计方法，旨在提高空间热环境下反射面天线的表面精度和张力分布。采用欧拉-伯努利梁建立桁架模型，基于胡克定律建立索网模型。应用变形协调条件形成系统模型，并将其应用于优化设计。由于在设计阶段充分考虑了桁架和索网的弹性变形和热变形，以及它们的耦合效应，可以减轻因热误差而进行形状调整的负担。数值算例表明，该方法能有效地提高温度区间内的曲面精度。为减小在轨形状误差和针对空间环境下的性能进行优化设计提供了方法论。
Mesh reflector antenna plays an important role in the future advanced satellite communication and broadcasting systems, earth observation, land sensing, deep space exploration, and space communication systems. The form of mesh surface is heavily dependent on cable tensions and vice versa. So, the form finding and optimization design of cable networks are extremely important. However, the current design methods conduct optimization under ambient temperature and ignore the shape errors caused by the thermal deformation in space thermal environment. The active on-orbit shape adjustment is limited by the on-orbit measurement and control techniques in the application. The present preliminary adjustment before launch only considered the cable network's thermal effects and ignored the influences of the truss elastic and thermal deformation on the surface accuracy. Here we proposed an optimization design method for mesh reflector antennas aiming at improving the surface accuracy and tension distribution in the space thermal environment. The truss model is established by adopting Euler-Bernoulli beams and the cable network is modeled based on Hooke's law. The deformation compatibility condition is applied to form the systematic model which is further applied in the optimization design. As the elastic and thermal deformation of the truss and the cable network, as well as their coupling effects, are fully considered in the design stage, the burden of shape adjustment for thermal errors can be relieved. Numerical examples show that the proposed method can effectively improve the surface accuracy in the temperature interval. The work provides the methodology for the reduction of on-orbit shape errors and the optimization design aiming at the performances in the space environment.