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星載計(jì)算機(jī)的熱效應(yīng)預(yù)測(cè)分析及結(jié)構(gòu)設(shè)計(jì)

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

  • 摘要: 星上計(jì)算機(jī)對(duì)航天器控制性能與運(yùn)行壽命有著極其重要作用，而溫度又對(duì)計(jì)算機(jī)的性能有重要影響。利用SolidEdge及FloTHERM軟件對(duì)星上計(jì)算機(jī)進(jìn)行了熱分析與設(shè)計(jì)，推導(dǎo)出SolidEdge及FloTHERM模型簡(jiǎn)化規(guī)則，用于解決仿真的精度與效率問題。基于PCB發(fā)熱機(jī)理分析，給出空間環(huán)境試驗(yàn)條件要求的邊界條件；依據(jù)線路板組件功耗及機(jī)箱所處的溫度環(huán)境，建立各個(gè)線路板組件的FloTHERM熱分析模型；給出了整機(jī)及各個(gè)PCB板的溫度分布以及關(guān)鍵發(fā)熱元器件的溫度等熱損耗分析結(jié)果。所做工作可為星上計(jì)算機(jī)布局設(shè)計(jì)及在軌故障預(yù)測(cè)提供參考準(zhǔn)則。

     

    Abstract: In view of the important inffluence of the the themal 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 ofthe model ofme space computer are made by SolidEdge and FloTHERM to guarantee me accuracy and the efficiency of the calculation. Based on aIl analysis of the heat source of the PCB, the boundary parameters are detemined and the themodynamic equation is solved. According to the power consumption of the PCBs and me PC box, the themodynamic model of every pans 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.

     

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