空 间 大 型 桁 架 天 线 姿 态 与 振 动 一 体 化 控 制

Large truss structures are widely used in space applications with the growth demand of space missions，which makes the rigid-flexible coupling characteristics of the system increasingly enhanced. Therefore，the flexible vibration coupled with attitude is easy to occur in orbit. To realize the integrated control of the attitude and vibration of space large antenna with truss，the dynamics model is improved based on the Lagrange principle. In the equation，the coupling relationship between vibration of flexible structure and system attitude is discussed fundamentally. Then，a fixed-time global sliding mode controller is proposed to achieve the goal of the integrated control. The simulation results show that the proposed control algorithm can not only suppress the vibration response amplitude of the flexible structure in a short time，but also ensure the stability of the system attitude. The algorithm has good robustness and fixed time convergence characteristics.