平面薄膜天线张拉系统优化设计及天线结构模态分析

Optimal Design of Catenary System and Model Analysis for a Planar Membrane Antenna Structure

设计航天器平面薄膜天线双重索网张拉系统的构型,并以可伸展支撑杆承受轴力最小、薄膜阵面有效面积比最大、端杆长度最小为优化目标,对张拉系统进行多目标优化。优化后可伸展支撑杆所受轴力减小了15.51%,薄膜阵面有效面积比提高了1.25%,端杆长度减小了0.30%。利用ABAQUS软件对索膜结构、支撑框架以及天线整体的模态分别进行仿真分析,将天线结构等效模型基频的解析解与仿真结果进行比对,二者相互印证。最后通过仿真分析,得出薄膜内拉应力、可伸展支撑杆壁厚、可伸展支撑杆铺层角度和端杆壁厚对天线整体基频的影响规律。

The double catenary system is designed for a planar membrane antenna. A multi-objective optimization strategy is applied to the catenary system, which exhibits the improvement of following three design objectives. The optimization result shows that the force loaded to the boom reduces by 15.51%, the percentage of the effective area for the membrane increases by 1.25% and the hub length reduces by O. 30%. Furthermore, the model of the cable-membrane structure, the frame and the whole antenna structure is analyzed by the software ABAQUS. The fundarnental frequency simulation results of the antenna structure are compared with the analytic solutions based on the equivalent model, and the results are verified. Finally, the influence law of the membrane stress, deployable boom thickness, fabric layers angle of the deployable boom and wall thickness of the huh on the fundamental frequency of the whole antenna structure is revealed.