光学精密工程2023，Vol.31Issue(24)：3580-3594,15.DOI:10.37188/OPE.20233124.3580
双轴音圈电机快速反射镜的系统建模与滑模控制
System modeling and sliding mode control of dual-axis voice coil actuator fast steering mirror
摘要
Abstract
A fast-steering mirror(FSM)is a key instrument in high-precision optical systems.However,the flexible-support FSM driven by a voice coil actuator(VCA)possesses complex coupling characteris-tics;this leads to a complex system model and severely impacts the control performance.To address this issue,this study proposes a dual-axis integral augmented sliding-mode control method,based on system identification and model reduction.Firstly,an accurate coupled VCA-FSM model is established using the Hankel-matrix system-identification method based on pulse response.Subsequently,based on balanced re-alization and truncation,the high-order model is reduced,while ensuring model accuracy.Next,an inte-gral augmented sliding-mode controller is designed,adopting a modern control-theory method and using the reduced-order model.A state observer is constructed to create the sliding-mode switching function and control law,and the sign function is improved in the control design to eliminate sliding-mode chattering.Finally,frequency-domain and time-domain performance-testing experiments are conducted on the VCA-FSM servo control-system experimental platform.The experimental results demonstrate that the pro-posed control method significantly improves the control performance of the VCA-FSM servo system,com-pared to the single-axis sliding-mode and PID control methods.The closed-loop tracking bandwidth is in-creased by approximately 50.3%and 251.3%,respectively,the disturbance-suppression bandwidth is in-creased by approximately 39.9%and 451.9%,respectively,the settling time of the step response is re-duced by approximately 29.7%and 97.7%,respectively,and the tracking accuracy of the spiral line is im-proved by approximately 48.5%and 97.8%,respectively.Moreover,the proposed control method con-trols the decoupling of the VCA-FSM with strong coupling characteristics.The control method proposed in this study greatly improves the control performance of the VCA-FSM.关键词
快速反射镜/音圈电机/系统辨识/模型降阶/滑模控制Key words
Fast Steering Mirror(FSM)/Voice Coil Actuator(VCA)/system identification/model re-duction/sliding mode control分类
计算机与自动化引用本文复制引用
李智斌,李亮,张建强,孙崇尚..双轴音圈电机快速反射镜的系统建模与滑模控制[J].光学精密工程,2023,31(24):3580-3594,15.基金项目
国家自然科学基金资助项目(No.61733017,No.61933006) （No.61733017,No.61933006）
山东省自然科学基金资助项目(No.ZR2021QF117,No.ZR2021QF140) （No.ZR2021QF117,No.ZR2021QF140）
