【作者】 李凯；

【导师】 朱敏波；

【作者基本信息】 西安电子科技大学 ， 机械设计及理论， 2011， 硕士

【摘要】 热-结构变形误差是影响天线电性能的主要因素之一,因此有必要对其做深入的研究。本文针对椭圆形有源相控阵天线和平板裂缝阵天线进行了天线结构热变形的分析研究。首先建立了一个椭圆形有源相控阵天线的简化模型,分析了该天线在不同热载荷下的天线阵面热变形,并且分析了该天线在重力加速度条件下的天线阵面变形。通过提取天线在不同的热载荷及重力加速度条件下的天线阵面变形,分析计算了各种阵面变形对天线电性能的影响。根据实际工程和项目的需要,编写了一款针对椭圆形有源相控阵天线的阵面参数化建模和热分析软件V2.0版本,该软件可以进行椭圆形阵面、圆形阵面和矩形阵面的参数化建模,并且可提取出不同阵面辐射单元的坐标、热变形位移和温度等数据,为后续的电性能分析提供了数据。文中最后分析了平板裂缝阵天线的钎焊变形,建立了平板裂缝阵天线钎焊分析模型,使用生死单元技术分析了不同的钎料热膨胀系数对钎焊变形的影响,并分析天线在不同的初始预紧力下的变形。本文针对两种典型的机电电子设备的热变形做了较为深入的研究,所完成的工作对提高天线的电性能指标具有一定的指导意义。更多还原

【Abstract】 Thermal-structural deformation error of antenna is one of the major factors that influence electrical performance of antenna. Therefore, in-depth research on this is essential. This paper aims to make a through study of the thermal-structural deformation of the oval-shaped active phased array antenna (APAA) and the plate slot array antenna. First, by simulating a simplified model oval-shaped active phased array antenna (APAA), it analyzed thermal deformation of the array-surface of antenna in different thermal loads and examined the deformation of array-surface of antenna in the condition of the acceleration of gravity. Then, by extracting the array-surface deformation of antenna, it analyzed and calculated all kinds of array-surface deformation’s influence to electrical performance of active phased array antenna. Based on the actual needs of engineering and projects, a software version V2.0 was developed to prepare for the array-surface parameter modeling and thermal analysis of the oval-shaped active phased array antenna. The software can run three kinds of parameter modeling which include oval-shaped array-surface, circle array-surface and rectangle array-surface. It can also extract the coordinate, displacement of thermal deformation and temperature of the radiate cell in different array-plane which serves as the data for the subsequent analysis of electrical performance of the antenna. Finally, it analyzed the brazing deformation of the plate slot array antenna and established the brazing modeling of the plate slot array antenna. In addition to that, it analyzed the influence of the different brazing thermal expand coefficient to the brazing deformation by the method of element birth-death technique, as well as the deformation of the plate slot array antenna in different initial preloads.Focusing on the thermal deformation of the two typical electrical equipments, this in-depth study paper can surely provide valuable guidance for improving the electrical performance of antenna.更多还原