Abstract: A finite element simulation modeling and flexible structural dynamics analysis of solar sail spacecraft are investigated in this paper. According to the actual structural characteristics of solar sail spacecraft, a reasonable finite element model is obtained. The reasonable value and direction of preload are given. The buckling modal analysis of stretch arm and the critical buckling load are obtained. The modals without and with preload are analyzed respectively and compared. The modal with preload is demonstrated more reasonable. The modal analysis with preload provides basic data for the design and simulation of solar sail spacecraft control system.

Key words: solar sail, finite element simulation, preload, modal analysis, buckling