机载SAR天线座连接支架的拓扑优化设计

拓扑优化方法在雷达天线座的减重设计中具有突出优势,特别适合于大型精密雷达和机载雷达天线座的结构优化设计。文中建立了连接支架的拓扑优化模型,以单元密度为设计变量,体积分数上限为约束条件,加权应变能最小化为优化目标,对机载SAR天线座连接支架进行了拓扑优化设计。考虑到结构美观和制造性,添加了对称平面约束和拔模约束。结果表明:拓扑优化结果符合仿生学原理,在减轻质量的同时,也提高了结构性能。

Topology Optimization Design of Connecting Bracket of Antenna Pedestal in Airborne SAR

The topology optimization method has outstanding advantages for weight reduction design of antenna pedestal. It is particularly suitable for structural optimization design of antenna pedestals in the high precision radar and the airborne radar. The topology optimization model of connecting bracket is set up in this paper. The connecting bracket of antenna pedestal in airborne SAR is designed by topology optimization method with densities of each element in the design space as design variables, the upper limit of volume fraction in the de- sign space as constraint condition and the weighted compliance minimization as optimization object. For the at- tractive appearance and manufaeturability, the 2-plane symmetry and draw are added in topology optimization model. The results show that the optimal structure accords with the bionics principle, can reduce the weight and improve the structural performance.