星载计算机的热效应预测分析及结构设计

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。

Analysis and prediction of the themal effect of space computer and its structural design

In view of the important influence of the thermal behavior of the space computer on the control and lifetime of the spacecraft, the software SolidEdge is used, combined with FloTHERM to make thermodynamic analyses of the space computer. The simplifications of the model of the space computer are made by SolidEdge and FloTHERM to guarantee the accuracy and the efficiency of the calculation. Based on an analysis of the heat source of the PCB, the boundary parameters are determined and the thermodynamic equation is solved. According to the power consumption of the PCBs and the PC box, the thermodynamic model of every parts is built. The temperature distributions of every part and its key elements are obtained. The results provide some guidance for selecting design parameters and predicting failure of the space computer.