大型反射面天线电磁场与位移场场耦合模型及其在65m口径天线设计中的应用

Field-coupling Model of Reflector Antenna with Electromagnetic and Displacement Fields and Its Application to Reflector Antenna with the Diameter of 65m

针对大型反射面天线设计机电分离的现状,基于电磁场与结构位移场的场耦合理论模型,建立以天线电性能为目标,结构拓扑形式为设计变量,同时满足自重、强度等约束条件的优化设计模型。详细讨论场耦合分析模型的分析方法,并指出将拓扑变量引入机电综合优化模型时带来的基结构规模过于庞大的问题。利用虚实单元的当前受力状态和潜在受力状态来判断杆件是否应加入到基结构中去,并以此降低了优化模型的求解规模,使得所提方法更加适宜在工程中应用。考虑到天线副面调整的对电性能的补偿效果,在优化模型中加入副面调整设计变量。提出求解策略和方法,进行大量的数值计算。进而应用于深空探测65 m口径反射面天线的工程设计中,取得了满意的结果。

Considering the separation between the electronics and mechanics in large reflector antenna design, the field coupling model is used to establish the optimization model. For the aim of the electromagnetic properties, under the restriction of the maximum mass and stress, an optimization model is established. The method of the field-coupling model is discussed, and the problem of adding the topology variables into the optimization model is pointed out. The current state of the actual situation of unit force and potentially force is used to determine whether the element should be added to the ground structure. The solving scale of optimization model is reduced so as to make this method more suitable to be applied in the project. The antenna sub-surface adjustment to compensate for the electrical properties is taken into account; the value of adjustment is added into the optimization model as design variables. A lot of numerical calculations are finished based on it. The method is applied to the 65 m antenna structure design. A preferable design is found contrast to the result of the olotimization model.