基于太阳模拟器的网状天线热变形仿真与试验研究

Simulation of thermal deformation of mesh antenna and experimental research based on solar simulator

准确预示天线在轨温度并分析天线热稳定性的影响因素是改善天线性能的重要方面。文章通过构建网状天线热分析和热变形有限元模型,仿真得到碳纤维主反射面、支撑肋组件等结构在两种工况太阳侧照下的温度场以及热变形场;在真空低温环境下,利用太阳模拟器对网状天线进行热真空原位环境热变形摄影测量试验。对比表明,仿真模型计算结果与试验测量结果符合性较好。鉴于模拟外热流的准直性对试验结果的影响较大,在热仿真时需要针对入射热流的准直性对热模型进行辐射误差补偿。

For improving the antenna’s performance,it is essential to accurately predict the antenna’s on-orbit temperature and analyze the factors affecting the antenna’s thermal stability.A finite element model is established for simulating the temperature field and the thermal deformation of a mesh antenna.With this model,the temperature field and the thermal deformation on the carbon fiber main reflecting surface,the support rib assembly and other mechanisms are determined under the conditions of the side solar incidence with two levels of irradiance.And in the vacuum and in the low temperature environment,the solar simulator is used to test the thermal deformation of the mesh antenna.It is found that the calculated results based on the simulation model are in good agreement with the experimental measurement results.Because the collimation of the heat flow has a significant influence on the experimental results,the radiation error compensation should be made in the thermal simulation according to the collimation of the incident heat flow.