光学 精密工程, 2016, 24 (7): 1632, 网络出版: 2016-08-29  

微膨胀型热开关热特性的参数敏感性

Parameter sensitivity of thermal characteristics for micro-expansion type heat switch
作者单位
1 中国科学院 长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100049
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6.716 m0.5·K/W和5129 m0.5·K0.5/W0.5; 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1.865 K/W 和0.267 m·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56.495 K/W(0.307 m·K/W)和32.936(0235 m·K0.5/W0.5)。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
The effects of various uncertain factors in the conduction path of a micro-expansion type heat switch on its thermal characteristics including OFF thermal resistance, ON thermal resistance and ON/OFF ratio were researched using parameter sensitivity analysis method. By comparing with the property experiment, the validity of heat switch finite element thermal model was verified. Based on the model, the relevance between thermal conductivity of structural components, thermal contact conductance of mating surfaces and OFF thermal resistance, ON thermal resistance and other thermal characteristics was analyzed. Then, the sensitivity of uncertain factors was classified by the absolute/relative variation of performance indexes. Research shows that the thermal conductivity of positioning shaft is the sensitive parameter about OFF thermal resistance and ON/OFF ratio, and the sensitivity indexes are 6.716 m0.5·K/W and 5.129 m0.5·K0.5/W0.5 respectively. The thermal contact conductance between cold side and disc is the sensitive parameter about ON thermal resistance, and the absolute variation and the sensitivity index are 1.865 K/W and 0.267 m·K/W respectively. The thermal contact conductances of other mating surfaces are the insensitive parameters about ON thermal resistance. Moreover, the shaft thermal facet-contact conductance is the sensitive parameter about OFF thermal resistance and ON/OFF ratio, and the absolute variations (sensitivity indexes) are 56.495 K/W (0.307 m·K/W) and 32.936 (0.235 m·K0.5/W0.5) respectively. These conclusions could provide the targeted reference for the structure-performance optimization of micro-expansion type heat switches.

张旭升, 郭亮, 马明朝, 黄勇, 毛阿龙, 吴清文. 微膨胀型热开关热特性的参数敏感性[J]. 光学 精密工程, 2016, 24(7): 1632. ZHANG Xu-sheng, GUO Liang, MA Ming-chao, HUANG Yong, MAO A-long, WU Qing-wen. Parameter sensitivity of thermal characteristics for micro-expansion type heat switch[J]. Optics and Precision Engineering, 2016, 24(7): 1632.

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