一种偶极子天线振动裂纹分析与结构优化  

Vibration Crack Analysis and Optimization of a Dipole Antenna

作　　者：朱庆流 古智祥 王森 彭欢[1] ZHU Qingliu;GU Zhixiang;WANG Sen;PENG Huan(The 29th Research Institute of CETC,Chengdu 610036,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,四川成都610036

出　　处：《机械》2023年第5期40-45,共6页Machinery

摘　　要：为了解决某机载吊舱中偶极子天线在振动试验时电缆和承力结构出现裂纹的问题,本文通过模态仿真和振动试验结合的方法对其进行了研究。建立天线结构有限元网格模型,进行模态仿真,仿真结果与试验现象一致。根据仿真结果分析发现导致开裂问题的模态类型,其中低阶振动模态导致底板位移,引起安装的电缆自身弯曲振动,最终导致开裂的连锁反应。分析发现广义质量占比参数可帮助判断模态主振型。通过增加支撑和使用新材料的方法对天线进行结构优化设计,并对各方案进行仿真和比较,选取合适的实施方案。优化后的天线顺利通过振动试验考核。The mechanics simulation and vibration test are carried out to resolve crack of in cables and load-bearing structures of airborne dipole antenna.Finite element mesh model of the antenna is designed for modal simulation.The simulation result is consistent with vibration test,and the affecting mode of crack is found.Low-order vibration mode causes bottom plate displacement,leading to the bending vibration of the installed cable itself,and finally results in the chain reaction of cracking.Main mode of the model can be found by generalized mass.The structure optimization design is carried out by increasing support and using new materials.Appropriate structure is found by the analysis of simulation.Finally,this structure strength of antenna is proved by vibration test.

关 键 词：偶极子天线 模态分析 振动试验 电缆布线 

分 类 号：TN82[电子电信—信息与通信工程]