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1.中国科学院 航空光学成像与测量重点实验室, 吉林 长春 130033
2.中国科学院 长春光学精密机械与物理研究所, 吉林 长春 130033
Received:12 May 2020,
Revised:08 June 2020,
Accepted:08 June 2020,
Published:25 September 2020
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Fu-chao WANG, Yu-tang WANG, Da-peng TIAN. Perfect tracking control for fast-steering mirror driven by voice coil motor[J]. Optics and precision engineering, 2020, 28(9): 1997-2006.
Fu-chao WANG, Yu-tang WANG, Da-peng TIAN. Perfect tracking control for fast-steering mirror driven by voice coil motor[J]. Optics and precision engineering, 2020, 28(9): 1997-2006. DOI: 10.37188/OPE.20202809.1997.
音圈电机驱动的快速反射镜在传统控制方法下具有严重的相位滞后,限制了其性能。针对这一问题提出了一种完全跟踪控制方法(Perfect Tracking Control,PTC)。首先,建立音圈快速反射镜系统离散状态空间模型,构建多速率采样系统,对长周期采样控制环节设计完全跟踪控制器;然后,对短周期环节设计基于离散滑模变结构控制的内回路补偿控制器。新方法实现了音圈快速反射镜对指令的完全跟踪,并有效补偿了外部扰动、模型不确定性以及机械非线性等因素对系统性能的影响,保证了系统的鲁棒性。实验结果表明:PTC控制实现了系统工作频带的扩展,与传统PID控制相比,系统的阶跃响应调节时间缩短50%,静态位置波动峰峰值减小50%;与基于干扰观测器和零相差跟踪控制器的方法相比,系统的位置稳态误差由1.5%减小到0.05%。采用新方法的音圈快速反射镜对幅值360"的正弦位置指令跟踪的双十带宽达到375 Hz,有效改善动态性能,拓展控制带宽。
The traditional control method for a fast-steering mirror driven by a voice coil motor suffers from serious phase lag
which limits the performance. Herein
a perfect tracking controller (PTC) was proposed to solve this problem. First
a discrete state space model of the voice coil-driven fast-steering mirror was established
a multirate sampling system was constructed
and a PTC was designed for long-cycle operations. Second
an internal compensator controller was designed for short-cycle operations based on the discrete-time sliding mode control method. The new method achieves perfect tracking of the voice coil-driven fast-steering mirror and reduces the effects of external disturbances
model uncertainties
and mechanical nonlinearity
thus ensuring the robustness of the system. Experimental results show that the proposed PTC improves bandwidth performance. Compared with the proportional-integral-derivative controller method
the system step response time is reduced by 50% and position error is reduced by 50%. Compared with the disturbance observer and zero phase error tracking controller method
the steady-state error is reduced from 1.5% to 0.05%. Moreover
the proposed method allows the fast-steering mirror driven by a voice coil motor to track sine position commands with an amplitude of 360"; the double-decade bandwidth is up to 375 Hz. The proposed method can effectively improve dynamic performance and expand the system control bandwidth.
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