›› 2017, Vol. 37 ›› Issue (2): 213-216.DOI: 10.3969/j.issn.1006-1355.2017.02.043

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Thermal Vibration Analysis of the Antenna of Low Orbit Satellites of the Earth

  

  • Received:2016-09-27 Revised:2016-11-28 Online:2017-04-18 Published:2017-04-18

地球低轨道卫星天线在轨热致振动分析

祝尚坤1何安琦1刘杰1张翔1王耀霆2李兵1   

  1. ( 1. 西安交通大学  机械制造系统工程国家重点实验室,西安  710000;2. 西安空间天线电技术研究所,西安  710000 )
  • 通讯作者: 李兵

Abstract:

Due to the frequent shielding of the earth, when the earth's satellite in low orbit, the deployable antenna of the satellite will be in a high and low temperature environment, thus forming a violent change of the temperature field. Severe temperature gradient changes can lead to large flexible deployable antenna, the thermal induced vibration, and reduce the lifetime of the key parts of the whole satellite polarization detection head. This paper builds a physical model of a satellite, and then analyze the space orbit of the transient heat when using the finite element method, the temperature field of deployable antenna, the temperature as constraint is mapped to the structure simulation, and analysis of satellite thermal deformation in the finite element model, realize the prediction of satellite antenna thermal vibration and provide data support. Thermal analysis of the satellite model can monitor the temperature field in each period and predict the possibility of thermal induced vibration, so as to avoid this kind of unfavorable disturbance after the continuous optimization design.

摘要:

由于地球的频繁遮挡,当地球卫星在低轨道运行时,卫星的可展开天线会处在高低温交替的环境中,从而形成剧烈变化的温度场。剧烈的温度梯度变化会导致柔性较大的可展开天线发生热致振动,降低卫星全极化探测头部等关键部件的寿命。首先建立某型号卫星的物理模型,然后利用有限元法对其进行在轨时的空间瞬态热分析,得到可展开天线的温度场,将温度作为约束映射到结构仿真中,再在结构有限元模型上分析卫星的热变形,实现卫星天线热致振动的预测并为天线结构优化设计提供数据支持。对卫星模型进行热分析可以监测各时期的温度场以及预测有可能发生的热致振动,从而在不断优化设计的基础上避免这种不利的扰动。

关键词: 振动与波, 卫星, 可展开天线, 热分析, 热致振动

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