微膨胀型热开关热特性的参数敏感性
发布时间：2019-04-24 02:35
【摘要】：采用参数敏感性分析法研究了微膨胀型热开关导热路径上各项不确定因素对其断开热阻、闭合热阻及开关比等关键热特性的影响。通过与性能试验的比对,验证了热开关有限元仿真热模型的正确性。基于该模型,分析了结构组件导热系数和配合面接触热导率与断开热阻、闭合热阻等热特性的关联性,并依据性能指标的绝对/相对变化量对不确定因素进行了敏感性分类。研究表明:定位杆导热系数是关于断开热阻和开关比的敏感参数,敏感性指标分别为6.716m~(0.5)·K/W和5.129 m~(0.5)·K~(0.5)/W~(0.5);冷端-伸缩段间接触热导率是闭合热阻的敏感参数,绝对变化量和敏感性指标分别为1.865K/W和0.267m·K/W,其余配合面的接触热导率均是闭合热阻的不敏感参数;定位杆径向小面接触热导率是断开热阻和开关比的敏感参数,绝对变化量(敏感性指标)分别为56.495K/W(0.307m·K/W)和32.936(0.235m·K~(0.5)/W~(0.5))。所得的结论可为优化微膨胀型热开关的结构性能提供参考与借鉴。
[Abstract]:By means of parameter sensitivity analysis, the influence of various uncertain factors on the key thermal characteristics such as breaking resistance, closing thermal resistance and switching ratio on the thermal conductivity path of micro-expansion type thermal switch is studied. Through the comparison with the performance test, the correctness of the thermal switching finite element simulation thermal model is verified. Based on the model, the relationship between thermal conductivity of structural assembly and contact thermal conductivity of structural assembly, breaking thermal resistance and closed thermal resistance is analyzed, and the sensitivity of uncertain factors is classified according to the absolute / relative variation of performance index. The results show that the thermal conductivity coefficient of the positioning rod is a sensitive parameter about the breaking resistance and the switch ratio, and the sensitivity indexes are 6.716m0.5K / W0.5 and 5.129 m0.5K0.5 / W0.5, respectively. The contact thermal conductivity between cold end and stretch section is a sensitive parameter of closed thermal resistance. The absolute change and sensitivity index are 1.865K/W and 0.267 m 路K / W, respectively. The contact thermal conductivity of other contact surfaces is insensitive to closed thermal resistance. The radial contact thermal conductivity of the positioning rod is a sensitive parameter for breaking the thermal resistance and switching ratio. The absolute variation (sensitivity index) was 56.495K/W (0.307 m 路K / W) and 32.936 (0.235 m 路K ~ (0.5) / W ~ (0.5).) respectively). The conclusion can be used for reference to optimize the structure and performance of micro-expansion heat switch.
【作者单位】： 中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：中国科学院长春光学精密机械与物理研究所空间机器人中心创新基金资助项目(No.SREC2013CX0201)
【分类号】：V444.36
本文编号：2464036
[Abstract]:By means of parameter sensitivity analysis, the influence of various uncertain factors on the key thermal characteristics such as breaking resistance, closing thermal resistance and switching ratio on the thermal conductivity path of micro-expansion type thermal switch is studied. Through the comparison with the performance test, the correctness of the thermal switching finite element simulation thermal model is verified. Based on the model, the relationship between thermal conductivity of structural assembly and contact thermal conductivity of structural assembly, breaking thermal resistance and closed thermal resistance is analyzed, and the sensitivity of uncertain factors is classified according to the absolute / relative variation of performance index. The results show that the thermal conductivity coefficient of the positioning rod is a sensitive parameter about the breaking resistance and the switch ratio, and the sensitivity indexes are 6.716m0.5K / W0.5 and 5.129 m0.5K0.5 / W0.5, respectively. The contact thermal conductivity between cold end and stretch section is a sensitive parameter of closed thermal resistance. The absolute change and sensitivity index are 1.865K/W and 0.267 m 路K / W, respectively. The contact thermal conductivity of other contact surfaces is insensitive to closed thermal resistance. The radial contact thermal conductivity of the positioning rod is a sensitive parameter for breaking the thermal resistance and switching ratio. The absolute variation (sensitivity index) was 56.495K/W (0.307 m 路K / W) and 32.936 (0.235 m 路K ~ (0.5) / W ~ (0.5).) respectively). The conclusion can be used for reference to optimize the structure and performance of micro-expansion heat switch.
【作者单位】： 中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：中国科学院长春光学精密机械与物理研究所空间机器人中心创新基金资助项目(No.SREC2013CX0201)
【分类号】：V444.36
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