某机载雷达天线框架结构的有限元分析

天线框架是天线的安装平台和精度基准,其结构刚度与强度直接关系到机载雷达的性能。文中以某机载雷达天线框架结构为研究对象,建立了完整的有限元仿真模型,进行了模态分析,给出了结构的前6 阶固有频率及振型,完成了该结构在加速度过载下的准静态分析及随机振动的响应分析,得到了相应的变形和应力值,并计算了相应的安全裕度。结果表明,该机载雷达天线框架具有较高的基频和较好的刚强度,结构设计满足机载产品抗力学环境设计要求。

Finite Element Analysis of the Antenna Frame Structure of an Airborne Radar

The antenna frame is the installation platform and precision benchmark of airborne radar antenna.The stiffness and strength of the electronic equipment effect on the performances of airborne radar crucially. In this paper, the stiffness and strength response analysis of the antenna frame structure of an airborne radar is established. Based on the precise FEA model, the modal analysis is conducted; the natural frequency and vibration modes are obtained. Then the quasi-static analysis of the acceleration overload is carried out and the values of deformation and stress are obtained. The random vibration performance is also analyzed and the corresponding mechanical responses are obtained. It is shown that the structure design of the antenna frame structure of the airborne radar satisfies the strength requirement.