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星上计算机对航天器控制性能与运行寿命有着极其重要作用,而温度又对计算机的性能有重要影响。利用SolidEdge及FloTHERM软件对星上计算机进行了热分析与设计,推导出SolidEdge及FloTHERM模型简化规则,用于解决仿真的精度与效率问题。基于PCB发热机理分析,给出空间环境试验条件要求的边界条件;依据线路板组件功耗及机箱所处的温度环境,建立各个线路板组件的FloTHERM热分析模型;给出了整机及各个PCB板的温度分布以及关键发热元器件的温度等热损耗分析结果。所做工作可为星上计算机布局设计及在轨故障预测提供参考准则。
Onboard computers on the spacecraft control performance and operating life has an extremely important role, and the temperature has a significant impact on the performance of the computer. Solidworks and FloTHERM software were used to analyze and design the on-board computer. The simplified rules of SolidEdge and FloTHERM models were deduced to solve the problem of accuracy and efficiency of simulation. Based on the theory of PCB heat generation, the boundary conditions of the space environment test conditions are given. The FloTHERM thermal analysis model of each circuit board assembly is established according to the power consumption of the circuit board components and the temperature environment of the chassis. Board temperature distribution and the temperature of the key components such as heat loss analysis results. The work can provide reference guidelines for onboard computer layout design and on-orbit failure prediction.