Study On The Interactional Shading Algorithms Of Large Deployable Antenna

A deep study is made on shading problem on large deployable antenna that has not been solved in this paper, which is based on structures and parameters of deployable antenna and the research status of the outer thermal flux calculation.This paper analyses the form of the earth shading for large deployable antenna and corrects the conventional formulae calculating the earth shading time.A detailed discussion about the shading problem of the different heat sources for large deployable antenna is made, and an idea that the different shading algorithms for the dissimilar heat sources is given.The shading algorithms for the different heat sources are given, that is, the light projection for the solar radiation and the Monte-Carlo method for the earth albedo and emitted radiation.The example gives the variation curve of the shading coefficient for the space structures. The different results of the solar radiation received by the space structures that the shading is taken into account or not, which is in agreement with the results given in the literature.The shading algorithm for the large deployable antenna is programmed, also which is put into the outer thermal flux program made by other people. Thus, the all-purpose program for the outer thermal flux is completed.