Abstract: The variable structure control and the model reference adaptive control are combined, and utilized to solve the large flexible space srtucture (LFSS)active control problem. Taking the structure dynamical variables of LFSS as system states, the variable structure model reference adaptive (VSMRAC) coupling active control system is established. The choice methols of the high-order reference model and the sliding mode parameter matrix are also studied here.Taking a symmetry two-panel space station as an example, the digital simulations of the VSMRAC active control system are made . The results show that the VSMRAC system possesses obvious advantages in the aspects of robustness, fastness engineering realization.

Key words: large flezible space structure, active control, variable structure model reference adaptive, coupling control, robustness