| As a key component of space optical communications,tactical laser weapons,and high-precision tracking devices,the control technology of fast mirrors has been a research hotspot at various research institutes at home and abroad.On the one hand,this kind of precision optical system is easily affected by various factors.Operating temperature and humidity,complex electromagnetic conditions,vibration of the platform,and aging of the components all have a great impact on the system,and even make the system completely unable to work.On the other hand,whether it is space optical communication,tactical laser weapons or high-precision tracking equipment,they are often in such a harsh working environment,but they also have extremely high requirements for the stability and rapidity of tracking and positioning.In view of this situation,this article mainly studied the control technology of the fast mirror system,and theoretically designed a new control algorithm for the fast mirror system.It was verified through experiments and achieved the desired control effect.This article uses the FSM-300 fast mirror system produced by the New Port Company of USA as the research object.The system includes the FSM-300 mirror and the FSM-CD300 B analog controller/driver.The purpose of the research is to improve the dynamic performance of the object..Firstly,the structure and composition of the research object are analyzed,and the basic transfer function model of the research object is constructed by mechanical and electro-dynamic analysis.At low frequency,the model can be approximated as a second-order system.Then,the unknown parameters of the transfer function model were systematically identified,the original system's analog controller was cut off,and it was only used as a drive to access the system.The Agilent 35670 A dynamic analyzer produced by Agilent in the United States could obtain the open-loop BODE diagram of the system.The analysis of BODE graph yields a system-accurate transfer function model.The model has high fitting accuracy in the low frequency band,and the R-square of the fitting model reaches 0.9891.In order to improve the dynamic performance of the system and combine the characteristics of the system itself,three control algorithms are designed,namely fuzzy control,state space pole configuration method and optimal Gaussian quadratic control.Through computer simulation,the state space pole assignment method is fast.The correction effect of the mirror system is the best.The overshoot is: the adjustment time is,the steady-state error is,and the closed-loop-3dB bandwidth is 529 HZ.All the main performance indicators are in line with expectations.Finally,the control algorithm is discretized,and a digital controller is designed.The three algorithms can be run in the controller.The state of the system can be monitored and recorded by the upper computer in real time.The result is three control algorithms,the state space pole.The configuration method still has the best correction effect for the fast mirror system.Its overshoot amount is the regulation time is,the steady-state error is,and the closedloop-3dB bandwidth is 490 Hz. |
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