大型空间折展机构简化模型的热传导分析

Heat conduction analysis for simplified model of large scale space deployable structure

基于热传导效应和等效的热学参数,对空间伸展臂结构及所处热环境进行了简化处理。将边界温度条件进行傅里叶级数展开,利用一维热传导模型,分别计算了在边界上施加各阶展开分量作用时,简化伸展臂结构的瞬态温度响应,进而利用叠加原理得到了结构总体的近似热响应。建立了伸展臂热学分析的有限元模型,计算了伸展臂在相应条件下的动态热响应,验证了本文分析结果的合理性,为伸展臂结构的分析设计尤其是概念设计阶段的热性能评估提供了一定的工程参考。

Based on heat conduction and the equivalent thermal parameters,the space cable-strut deployable articulated mast and its ambient thermal environment were simplified. The dynamic boundary temperature was expanded into harmonic components adopting Fourier series,and the corresponding transient thermal response of the simplified mast under each component was calculated using one-dimensional heat conduction model,respectively. The overall transient response was then obtained via superposition principle. The thermal response under the same setup was estimated using a finite element model,by which the reasonability of aforementioned calculation was verified. The method presented in this paper could be a useful reference for thermal analysis of similar structures,particularly in conceptual design.