伞状膜式反射面的型面设计

Profile Design of Reflective Surface of Umbrella-shaped Membrane

针对支撑肋、反射膜面及索构成的伞状空间天线反射面,发展了一种新型、高效的型面精度调整以及形态设计的优化分析方法。首先,通过调整索牵引技术调整反射面形状,设计了索的布置方案,并基于支持向量机代理模型和遗传算法优化了调整索的索力值,将反射面型面误差RMS值减小到0. 6 mm以下;其次,充分考虑肋的变形,采用复位平衡法得到了肋的应力分布,通过应力释放获得肋的初始形状,确保肋变形后为反射面形状保持所需形状。

A novel and efficient method for adjusting accuracy and designing shape has been developed for the reflective surface of umbrella-shaped space antenna consisting of supporting rib,reflective membrane surface and cable.Firstly,in order to adjust the shape of the reflector surface by adjusting the cable traction technology,the layout of the cable is designed,and the cable force value is optimized and adjusted based on the support vector machine(SVM)surrogate model and genetic algorithm(GA),then the reflective surface error of root mean square(RMS)is reduced to less than0.6mm.Secondly,considering the deformation of the rib,the stress distribution of the rib is obtained by the reposition balance method.The initial shape of the rib is obtained by stress release,and the deformmation shape of the rib is maintained to the desired shape.