数控铣床进给伺服系统误差补偿的PID控制∗

摘要

进给伺服系统是数控机床的重要组成部分，但常规的PID控制器具有整定不良、性能欠佳和适应性差等缺点，不能满足实际加工的精度要求。对某型号数控铣床进给伺服系统常规PID控制器存在的问题进行分析，提出了加入全闭环控制和支持向量机PID控制系统的方法。通过补偿运动部件位移产生的误差，并将各传感器测量值反馈支持向量机PID控制系统，对PID控制参数进行自整定。通过仿真实验证实了该方法缩短了系统的调节时间，提高了系统抗干扰能力和适应力。%Feed servo system is an important part of cnc machine, and the conventional PID controller with setting bad, poor performance and adaptability, cannot satisfy the requirement of the actual processing preci-sion. Analysis the problems of the existing conventional PID controller for a certain type of CNC milling ma-chine feed servo system, put forward the method of adding the full closed loop control and support vector machine PID control system. By compensating the error of the displacement of the moving parts, and feed-back the sensor measurements to support vector machine ( SVM) PID control systems, self-tuning PID con-trol parameters. Through the simulation experiments prove that the method can shorten the adjustment time of system, improve the system of anti-interference ability and adaptability.