柔性天线面对漂浮基星载天线扰动分析及抑制

 为了研究柔性天线面弹性变形对漂浮基星载天线的扰动,采用固定界面模态综合法和Lagrange方法,通过轴末端与天线面交界面的协调关系,推导了大范围运动的星载天线刚柔耦合动力学模型,其所建立的动力学模型计算效率高并具有足够的精度。分析了柔性天线面弹性变形对星载天线的扰动,利用PD+振动力反馈控制抑制系统振动,并基于Lyapunov方法证明了控制系统的渐近稳定性。仿真结果表明：天线工作过程激起了柔性天线面弹性振动,进而引起星载天线的抖动,严重影响了星载天线的指向精度;利用其控制策略能快速抑制系统振动。结论对天线指向精度的分析与控制具有重要的理论价值及工程实际意义。

Disturbance Analysis and Suppression of Flexible Antenna Reflector on Free-floating Satellite Antenna

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.