三轴稳定卫星扫描镜伺服系统的谐振抑制
Resonance suppression of three-axis stabilized satellite scanning mirror servo system

本文针对三轴稳定卫星中的扫描镜伺服系统在运行时产生的机械谐振现象, 采用在反馈回路中加入加速度观测器的方法抑制此类机械谐振. 首先针对大惯量扫描镜伺服系统的机械传动结构建立研究模型, 通过数学推导和仿真分析谐振产生的原因及谐振对系统控制性能的影响; 然后采用加速度观测器方法, 将观测出的加速度反馈到伺服系统电流环的前端对谐振进行补偿, 并分析了噪声对观测器性能的影响与限制; 最后的仿真结果表明, 相比于采用陷波滤波器抑制谐振的方法, 采用加速度观测器能更为有效地抑制三轴稳定卫星中扫描镜伺服控制系统中的机械谐振, 并提高系统的控制性能, 且设计的观测器对噪声具有良好的鲁棒性.
In order to suppress the mechanical resonance that generated in the scanning mirror servo system of the three - axis stabilized satellite, the method that adding the acceleration observer in the feedback loop is adopted. Firstly, the model of the mechanical transmission structure of the scanning mirror servo system which has a large inertia load is established. The causes and the influences of the mechanical resonance on the control performance of the system are analyzed by mathematical derivation and simulation. Then, the acceleration observed by the acceleration observer is fed back to the front of the current loop of the servo system to compensate the mechanical resonance, and the influence and limitation of noise on the performance of the observer is analyzed. Finally, the simulation results show that using acceleration observer is more effective and helpful to suppress the mechanical resonance and improve the control performance of the scanning mirror servo control system compared to the method that using the notch filter, also, the designed observer has good robustness to noise.