空间相机接触热阻的计算

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，考查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试验数据较为吻合，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。

Calculation of thermal contact resistance for space camera

In order to solve the difficult problem of determining the value of the thermal contact resistance, a calculation method for space camera is brought up from the view of conduction and radiation among the contact surfaces. According to the material, machining, assembly and the actual operating environment, a reasonable range for thermal contact coefficient is obtained. The vertical camera, a sample to show the method, is reasonably meshed into finite element model with some simplification. Its temperature field is computed at low temperature steady-state equilibrium case with I-DEAS / TMG. And then temperature distribution, which is induced by the fluctuations of thermal resistance, is checked. The result of thermal analysis and the data of thermal environment simulation test are consistent very well and the maximum deviation is 0.45 ℃. It is shown that the calculation method of thermal contact resistance is reasonable and it could predict the thermal contact resistance of dry contact precision-machined surfaces in the space environment.