空间相机接触热阻的计算  

Calculation of thermal contact resistance for space camera

作　　者：黄涛[1,2] 吴清文[1] 梁九生[1,2] 余飞[1,2] 黎明[1,2] 

机构地区：[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]中国科学院研究生院,北京100039

出　　处：《中国光学与应用光学》2009年第4期334-339,共6页Chinese Optics and Applied Optics Abstracts

摘　　要：为了解决空间相机接触热阻难以确定的问题,从接触面传导和辐射换热的角度考虑,给出了其接触热阻的计算方法。根据空间相机的材料、加工、装配及其特殊运行环境,得到一个合理的接触系数范围。以空间相机的正视相机为例,对其结构进行合理的简化,利用I-DEAS/TMG热分析模块建立有限元模型,仿真计算了低温稳态平衡工况,考察了热阻波动对温度分布的影响。正视相机热分析计算结果和热环境模拟实验数据较为吻合,最大偏差为0.45℃。研究结果表明,该接触热阻计算方法合理,可以预测太空环境中干接触的精密加工表面间的接触热阻。In order to solve the difficult problem of determining the value of thermal contact resistance of a space camera, a calculation method is brought up from the view of conduction and radiation among the contact surfaces. According to the materials, machining, assembly and the actual operating environments, a reasonable range for thermal contact coefficients is obtained. The envisaged camera, a sample to show the method, is reasonably meshed into a finite element model with some simplifications. Then, its temperature field is computed at a low temperature steady-state equilibrium case with I-DEAS/TMG, and the temperature distribution in- duced by the fluctuation of thermal resistance is checked. The result of thermal analysis is consistent very well with the data of thermal environment simulation tests and the maximum deviation is 0. 45 ℃. It is shown that the calculation method of thermal contact resistance is reasonable and it can predict the thermal contact resistances of dry contact precision-machined surfaces in the space environment.

关 键 词：空间相机 热仿真 接触热阻 模拟实验 

分 类 号：V447.3[航空宇航科学与技术—飞行器设计]