单向曲率抛物反射面可展结构型面精度误差研究

Surface Accuracy Investigation on Deployable Cylindrical Reflector

具备大尺度、高精度特性的刚性反射面天线是解决星载微波遥感有效载荷空间分辨率、增益与信噪比等电气指标需求的优选方案,需要采用可展结构设计,以解决卫星尺寸与整流罩包络之间的矛盾。文章针对高精度单向曲率抛物反射面可展结构型面精度误差的分析及预示需求,基于刚体旋转的欧拉理论及正态分布,描述加工精度误差与展开重复精度误差,建立了可展结构型面精度误差的预测模型。并根据Monte Carlo试验结果数据的统计分析方法,开展了面向加工精度误差与展开重复精度误差的敏感度分析。结果表明:板间铰链的展开重复精度对整体型面精度误差的收益高于根部铰链,同等条件下应优先对其进行优化;在整体型面精度误差指标允许的前提下,应适当提高刚性抛物柱面的加工精度误差,从而控制整体型面精度误差的变化区间。

Large-scale solid surface reflector with high accuracy is a preferential scheme to implement the electric requirements of the resolution,the gain,and the signal to noise ratio of spaceborne microwave remote sensing payload,which should be deployable to resolve the contradiction between the dimension of the satellite and the envelop of the fairing.This paper dedicates on the investigation of the surface accuracy of deployable cylindrical reflector with solid surface.A prediction model is established based on Euler theory and normal distribution,which describes the machining error and the repeating error.A sensitivity analysis based on Monte Carlo simulation is implemented,and it can be concluded that the repeating error optimization of panel hinges more effective than of root hinges,which is the preference under equal conditions.The machining error restrictions should be relaxed so that the variation interval of the overall surface accuracy can be controlled with a precondition that the overall surface accuracy meets the demands.