Аннотация
In operation, the solar sail is under influence of external forces, the most significant is the pressure of sunlight for motion. The influence of external forces causes vibrations of solar sail, which can affect flight of the spacecraft and lead to damage of its structure. Here we consider three problems: (1) to obtain solar sail oscillation equation. This equation is derived for various forms of solar sail construction and various cases of loading; (2) to calculate thrust produced by deformed solar sail, since thrust will vary depending on the form of solar sail surface, the comparison with non-deformed solar sail will be made; (3) modeling of heliocentric motion of spacecraft with solar sail, taking into account deformation of the sail surface due to oscillations.