空间天线弹簧展开机构在轨展开热分析研究

Thermal Analysis for Spring Deployment Mechanism of Spaceborne Antenna

径向肋伞状天线采用缓释弹簧分布式驱动技术实现在轨展开,弹簧展开机构可靠工作成为影响天线功能实现的决定性因素。机构暴露在舱外恶劣的空间热环境中,但其内部结构热变形和润滑特性等需求对工作温度提出了严苛的要求。本文结合伞状天线弹簧展开机构入轨初期的瞬时控温要求和卫星热控资源约束,采用有限元分析软件TMG,建立完整的热数学模型对机构在轨展开时刻温度水平进行了瞬态热分析和主动控温加热器优化设计。飞行遥测温度数据表明,弹簧展开机构热控设计合理可行,满足在轨展开时刻的工作温度要求,为天线成功展开奠定了良好的基础。

For the radial rib umbrella antenna,slow-release spring distributed drive deployment technology is adopted.The performance of spring deployment mechanism has a decisive effect on the critical property of antenna.In the harsh space thermal environment,the spaceborne mechanism maintain appropriate temperature which is due to internal thermal deformation and lubricating characteristic.In this paper,finite element model of spring deployment mechanism and whole antenna were established for transient thermal analysis.Optimal thermal design of electrical heaters is proposed to meet the temperature requirement of deployment mechanism and satellite power demand.The flight temperature data indicate that the thermal design of the mechanism is reasonable and feasible.The thermal control methods satisfy the temperature demands and lay a good foundation for the successful deployment of the umbrella antenna.