相控阵雷达天线局部模态截断

动力学仿真计算较为关注承力构件的刚强度，其他构件仅对整体结构提供一定的刚度作用。当其他构件数量多、模态频率低时，容易出现重频和密频现象明显的局部模态，严重影响计算效率。文中提出利用模态综合法对非承力构件进行局部模态截断，既保留了其与主体结构的连接刚度，又消除了局部模态的影响，从而提高了仿真计算效率。针对相控阵雷达天线结构的精细有限元模型开展了局部模态截断研究，仿真结果表明，截断后的模态在保持原有精度的基础上，可以大幅提高动力学分析的计算效率。

Local Mode Truncation of Phased Array Radar Antenna

Dynamic analysis pays more attention to the stiffness and strength of load-bearing component, other components only provide certain stiffness to the overall structure. When the number of other components is large and their modal frequencies are low, it is prone to local modes with obvious phenomena of repetition frequency and dense frequency, which seriously reduce the calculation efficiency. In this paper, the modal synthesis method is proposed to truncate the local modes of non-load-bearing components, which not only retains the connection stiffness with the main structure, but also eliminates the influence of local modes, so as to improve the simulation efficiency. Based on the fine finite element model of the antenna structure of phased array radar, the local mode truncation is studied. The simulation results show that the truncated mode can greatly improve the computational efficiency of dynamic analysis while maintaining the original accuracy.