基于模糊控制策略的快速反射镜伺服控制

伺服性能是保证精确跟踪的前提条件,为了探索出提高快速反射镜伺服性能的控制方法,提出一种将模糊控制策略与PID结构相结合的模糊控制器用于快速反射镜伺服回路。该模糊控制器既继承了PID便于工程实现的优点,又拥有可自适应整定控制参数的特点,从而可提高现有快速反射镜的伺服性能,更好地适应各类运行工况。以基于高频摇摆电机的快速反射镜为应用对象设计了模糊控制器,进行仿真实验,并与基于传统PID控制的现有方案进行了对比。对实际工况下快速反射镜伺服性能的仿真实验结果表明:基于模糊控制策略的快速反射镜将抑制带宽从50 Hz提高到120 Hz、随机输入信号下稳态误差均方根从12. 996″压缩到1. 620″,验证了所提出的模糊控制器对提升快速反射镜伺服性能的可行性及有效性;基于模糊控制的快速反射镜可作为高精度复合轴系统中的子轴部分,应用于战术激光武器等要求跟瞄精度达到微弧度量级的光束定向场合。

Servo Control of Fast Steering Mirror Based on Fuzzy Control Strategy

The servo control performance is the precondition to ensure precise tracking. A control method is studied to improve the servo performance of fast steering mirror(FSM). A fuzzy controller combining fuzzy control strategy with PID structure is proposed for the servo loop of fast steering mirror. The controller not only has the advantages of PID which is easy to implement in engineering, but also possesses the characteristics of self-adaption adjustment of control parameters. It's better adapted to various operating conditions. A fuzzy controller is designed based on the fast steering mirror of a high frequency swing motor for simulation experiment, and is compared with the existing scheme based on the traditional PID control. The servo performance of the fast steering mirror was simulated under the actual working condition. The simulated results show that the fast steering mirror based on the fuzzy control strategy increases the suppression bandwidth from 50 Hz to 120 Hz, and compresses the steady-state root mean square error in case of random input signal from 12.996″ to 1.620″, thus the feasibility and effectiveness of using the fuzzy control strategy to improve the servo control performance of FSM are verified; the FSM based on fuzzy control can be used as the subsystem part of the high-precision compound axis servomechanism in tactical laser weapons and other beam orienting occasions requiring microradian tracking accuracy.