基于模糊PID控制的望远镜伺服控制系统

为了满足某种望远镜传递函数时变、速度精度要求高、位置定点时间长的控制要求,在分析经典PID的基础上,提出了一种模糊控制方案。通过构造模糊控制规则,模糊PID控制器能够根据误差和误差变化对控制器的比例、积分增益进行实时的调整。针对某望远镜模型,仿真验证了模糊PID控制与经典PID的控制性能,并在该望远镜上实验验证了速度控制及位置定点实验,速度为138.8°/s时最大稳态误差为0.4°/s,位置定点最大误差为0.0002°。仿真结果和实验结果均表明:模糊PID控制能满足该望远镜的观测要求。

Telescope servo control system based on fuzzy PID control

In order to meet the requirement control system of a transfer function changing telescope for high precision velocity,long time pointing,a fuzzy PID controller is proposed based on analyzing of classical PID control algorithm.By constructing fuzzy control rules,fuzzy PID controller can revise the coefficient of P,I and D according to the instantaneous of error and error change.Based on the transfer function of this telescope,the function of fuzzy PID controller is validated and the performance of classical PID is compared with that of the fuzzy PID by simulation.A velocity control and a position pointing is performed on this telescope,the steady-state error is less than 0.4°/s at 138.8°/s,and the maximum steady-error of position pointing experiment is 0.0001°.Both simulation and experimental results prove that the fuzzy PID controller can meet the requirements of this telescope.