针对某个星敏感器系统,根据有限元方法得到其温度分布,分别拟合得到了星敏感器系统温度分布与外表面太阳吸收率、外表面发射率、内表面发射率、太阳入射角以及镜筒、填充材料导热系数的函数关系,拟合公式与理论公式吻合。当外表面太阳吸收率和发射率从0.05增大到1时,系统平均温度改变量分别为149.89 ℃和147.44 ℃;内表面发射率对系统温度水平的影响明显小于外表面发射率的影响;太阳入射角为±11.97°时,系统温度水平最高;镜筒材料的导热系数和填充材料的导热系数对系统温差的影响存在一个非敏感区域,当导热系数分别大于60 W/(m·K)和200 W/(m·K)时,导热系数对系统温差的影响很小。

The relation of temperature level function with the outside surface solar absorptivity,outside surface emissivity,inside surface emissivity,angle of sun incidence is fitted respectively. The relation of temperature difference function with the thermal joint conduction and the heat conduction of drawtube is fitted respectively. The curve fitting function formula accords with the theory. The result shows that when the outside surface solar absorptivity and emissivity change from 0.05 to 1,the changes of temperature level in the star sensor system are 149.89 ℃ and 147.44 ℃. The effect of the inside surface emissivity on the temperature level is obviously smaller than that on the outside. When the angle of sun incidence is ±11.97°,the temperature level is the highest. The temperature difference effect of the thermal joint conduction and the heat conduction of the drawtube has a non-sensitivity region. When the thermal conductivity is more than 60 W/(m·K) and 200 W/(m·K) respectively,the thermal conductivity effect on the temperature difference is small.