【摘要】 为了提高具有表面微结构的零件的超精密加工中快刀伺服系统的跟踪精度和抗干扰性,研制了一种线性自抗扰控制器。通过对快刀伺服刀架建模分析,得到惯性环节和二阶振荡环节串联的等效模型,设计出三阶四维的线性扩张状态观测器,可对未知扰动的观测结果作出实时估计和补偿,由此设计出线性自抗扰控制器。数字仿真实验表明,线性自抗扰控制具有良好的控制品质,其中,在快刀伺服系统中的应用可以提高跟踪性能和抗干扰性。更多还原

【Abstract】 In order to improve tracking accuracy and robustness of fast tool servo(FTS)system,in ultra-precision machining for the microstructured surface components,the linear active disturbance rejection control(LADRC) was introduced. By modeling and analyzing the FTS,it obtained the equivalent model of inertia and second oscillation links in series. A four-dimensional and the three-order linear extended state observer(LESO)was designed. It can make real-time observations to estimate and compensate for unknown disturbances from all kinds of sources,and then the LADRC controller was designed.Digital simulation results showed that LADRC has good controlling quality. Its application in fast tool servo system can improve the tracking performance and robustness.更多还原