基于消隐算法的空间结构有效辐射面判断方法研究

Study of Judgment Method for Effective Radiation Surface of Space Structure Based on Blanking Algorithm

空间环境中若投入能量是均匀的,则到达空间结构表面的外热流只与空间结构在投入能量方向上的有效投影面积有关。据此,对空间结构外热流的求解问题将转化为空间结构有效投影面积的求解问题。文章参考图形学的相关算法,提出了一种快速的、具备较高精度的重叠投影区域判断方法,用于辅助空间结构有效投影面积计算。以大型复杂卫星为例,采用该算法对有效投影面进行判断,并根据有效投影面统计卫星的外热流情况,仿真结果表明,基于该算法构建的空间结构外热流计算方法,计算过程简单、能够反映空间结构轨道运动规律,与其它软件的计算结果差异较小。

If the energy arrives at surface of space structure is well-proportioned in space, the heat flux of space structure would be equal to effective radiation area of space structure. Based on this theory, the problem how to calculate heat flux can be transformed into that to find effective radiation area of space structure. This paper develops a quick and high-fidelity blanking algorithm based on algorithms of Computer Graphics, to help in calculating effective radiation area of space structure. The presented algorithm is used to determine the effective projection of huge multibody satellite, as an example, and then gets the heat flux of satellite. The results obtained well agree with those by the thermal analysis software, and the movement of satellite in orbit can be showed.