压电快速反射镜的神经网络滑模控制

打开文本图片集

关键词：激光通信；压电驱动；快速反射镜；径向基神经网络；滑模控制中图分类号：TP394.1;TH691.9 文献标识码：Adoi：10.37188/OPE.20263402.0231 CSTR：32169.14.OPE.20263402.0231

Neural network sliding mode control for piezoelectric fast steering mirrors

LU Lin 1，2. ， SUN Chongshang 1，2* ，LI Zhibin 1，2 ，LIU Yazhou 1，2

（1. College of Electrical Engineering and Automation， Shandong University of Science and Technology，Qingdao 266590，China;

2. Qingdao Key Laboratory of Advanced Control Technology for Smart Ocean Equipment， Qingdao 266590，China） * Corresponding author， E-mail： sun20O7cn@163. com

Abstract： To meet the demanding requirements of high-precision alignment and tracking in laser communication systems operating under complex environmental conditions，this paper presented a novel control algorithm for a piezoelectric-actuated fast steering mirror（FSM）．A Hammerstein-structured nonlinear model incorporating a Prandtl-Ishlinskii hysteresis representation was established for the piezoelectric actuator，and system linearization was achieved through a geometrically derived inverse model employed as a feedforward compensator. For the linearized system，a hybrid control strategy integrating radial basis function（RBF） neural networks with sliding mode control was designed，where the RBF network approximated unmodeled nonlinear parameters within the nonsingular fast terminal sliding mode control framework to enhance robustness while maintaining tracking precision. Experimental validation on a servo platform confirms the algorithm's effectiveness in tracking composite-frequency trajectories with a root mean square error below 2.7μrad .Under 10% model mismatch conditions，the method maintains a root mean square error under 7.3μrad when tracking 50Hz sinusoidal signals，representing performance improvements of approximately 40.16% and 75.9% over conventional nonsingular fast terminal sliding mode control and active disturbance rejection control， respectively，while demonstrating strong robustness against parameter perturbations.

Key words： laser communication； piezoelectric actuation； fast steering mirror；radial basis function neural network；sliding mode control

1引言

激光通信是一种使用激光光束作为载波的通信方式，具有高速率、高带宽、低功耗、低延迟、强相干性、强保密性的优点，广泛应用于军事和民用领域[1-2]。（剩余16354字）