Abstract: To study the disturbance of flexible antenna reflector elastic deformation to free-floating satellite antenna, the fixed-interface component-mode synthesis method and Lagrange’s equations are used. Under large motions, the rigid-flexible coupling dynamics model of satellite antenna is deduced through compatibility relations at the interface between axis end and antenna reflector. The model increases the computing efficiency without losing much accuracy. Then, satellite antenna dynamics is analyzed considering the antenna reflector as flexible body. Furthermore, the PD+vibration force feedback control law is used to eliminate the system vibration, and the asymptotic stability of the system is proved based on Lyapunov method. The results show that the antenna excites the elastic vibration of flexible antenna reflector, which in turn causes its own jitter. This seriously affects the satellite antenna pointing accuracy. However, the proposed control strategy can quickly suppress system vibration. The above conclusion would have important academic value and engineering significance in the analysis and control of antenna pointing accuracy.

Key words: satellite antenna, component-mode synthesis, flexible antenna reflector, elastic vibration, vibration suppression