Self-synchronization and control-synchronization of dual-rotor space vibration system

Abstract

Since the intrinsic characteristics of self-synchronization vibration system, the implementation of in-phase synchronization state is restricted, which leads to unsatisfactory force of dual-rotor system driven by two coaxial motors in the space. Thus, control synchronization is proposed in this paper to address the problems above. Firstly, to explore the defects of the self-synchronization vibration system, dynamic model of the dual-rotor space vibration system is established, and the self-synchronization mechanism of two eccentric rotors (ERs) is analyzed by small parameter average method. Subsequently, to implement the in-phase synchronization between the two ERs, controllers based on master–slave control structure (MSCS) and sliding mode control (SMC) algorithm are systematically designed. Finally, the effectiveness of self-synchronization mechanism and control-synchronization method is validated by simulations in Matlab/Simulink. The results show that the anti-phase synchronization state is appeared on account of small horizontal distance or larger installation height of the two ERs; however, with the application of controllers, the phase difference (PD) of the two ERs is successfully controlled at zero, and the strong robustness of the controllers is further demonstrated by the variations of rotation velocity and structural parameter.