摘要
论文针对数控进给伺服系统跟踪轨迹事先已知的特点,在常规反馈控制结构基础上引入预见前馈补偿控制;通过增加扩展误差系统状态变量方法,将P-PI串级进给伺服系统控制变换为状态反馈,运用偏微分最优化法求解预见前馈补偿控制系数。从而在不改变原有系统稳定性的基础上,利用预见前馈将位置给定量提前作用于速度控制器输入端,大大减小了位置跟踪误差。仿真例子验证了该方法的有效性。
In view of the characteristic of the CNC feeding servo system, the pathway of which is known beforehand, this paper adopted the preview feedback compensation control based on the feedback control structure. The P-PI cascade control in the common CNC servo system was converted into state feedback through increasing extensive error system. And the preview feedforward ratio is solved by using the partial differential optimize algorithm.By using the preview feedback, the position setting signal is added to the velocity controller, the position tracking error was greatly diminuted and not change feedback controller. The efficiency of this method has proved by simulink test.
出处
《组合机床与自动化加工技术》
2007年第7期61-64,共4页
Modular Machine Tool & Automatic Manufacturing Technique
关键词
预见前馈补偿
数控进给伺服
状态反馈
输出反馈
preview feedback compensation control
CNC feeding servo
state feedback
output feedback
