针对大型平板微波天线俯仰系统进行工程研究, 设计了一种强度高、质量轻的桁架结构作为天线背架。根据指标要求建立数学模型, 将整个运动过程通过准确的力学计算进行力矩分配, 从而选定电机、减速机等结构要件; 通过对关键结构件的有限元仿真及高功率微波环境下的电磁兼容性设计, 进一步保证整个俯仰系统可靠工作。通过实验验证, 承载负载总重达到 2 t左右, 角速度最高可达 10°/s, 可以完成 0°~70°俯仰运动, 定位精确度优于 0.1°。实测平板微波天线各项参数均能达到设计要求, 微波测试方向图形态良好, 波束指向满足要求。

The pitching system of a large plate microwave antenna is studied. A truss structure with high strength and light weight is designed as the antenna back frame. According to the index requirements, the mathematical model process is allocated through accurate mechanical calculation to select the structure elements such as motor and reducer. Through the finite element simulation of the key structure and the hardening design of high power microwave, the whole pitch system is further guaranteed to complete the experiment. The load is up to two tons, the rotation speed is 10° per second, and the range of pitch motion is 0°-70°. The positioning accuracy is better than 0.1°. All the parameters can meet the design requirements. The direction pattern of the microwave test is good, and the beam direction meets the requirements.