随动系统的模糊自适应整定PID变阻尼控制

Variable Damping Ratio Control of Servo System by Fuzzy Adaptive Adjust PID

为了使随动系统的输出以尽可能小的误差复现输入,通常用速度反馈以增大等效阻尼比的方法减小输出响应振荡和超调量,但阻尼比增大,系统响应迟钝,快速性变差。变阻尼控制技术根据系统输出响应的不同阶段在线实时调整系统的阻尼比,从而改善随动系统的动态性能。结合PID控制和模糊控制的优点,运用模糊推理方法建立PID三参数的模糊控制规则,设计出一种随动系统的模糊自适应整定PID变阻尼控制器。仿真结果证明了该方法可行,系统动态性能得到明显改善,具有良好的抗干扰性和鲁棒性。

In order to obtain the smallest error between input signal and output signal, servo systems generally decrease the oscillation and overshoot of output response of servo systems are usually decreased by increasing equivalent damping ratio with velocity feedback. But the output response will be laggar and system＇s speediness property will be become worse because of damping ratio＇s increment. Variable damping technique may adjust system＇s damping ratio in real-time on line on the base of output response＇s different phases, so servo system＇s dynamic property can be improved. Fuzzy adaptive and variable damping ratio controller is designed trough establishing PID＇s three parameters＇ fuzzy logic control rules based on property of PID control and fuzzy logic control with fuzzy reasoning method. Simulation results verify that the method is feasible, improvement of the dynamic property is prominent, and disturbance rejection property and robust is well.