一种分析伺服进给系统动态误差的新方法  

A Novel Method for Analyzing the Dynamic Error of Servo Feed System

作　　者：赫巍巍 王立平[3] 关立文[3] 李大奇[1] HE Wei-wei;WANG Li-ping;GUAN Li-wen;LI Da-qi(School of Mechanical Sci.and Eng.,Northeast Petroleum Univ.,Heilongjiang Daqing 163318,China;School of Mechanical and Aerospace Eng.,Jilin Univ.,Jilin Changchun 130022,China;Dept.of Mechanical Eng.,Tsinghua Univ.,Beijing 100084,China)

机构地区：[1]东北石油大学机械科学与工程学院,黑龙江大庆163318 [2]吉林大学机械与航空航天工程学院,吉林长春130022 [3]清华大学机械工程系,北京100084

出　　处：《机械设计与制造》2021年第10期159-164,168,共7页Machinery Design & Manufacture

基　　金：东北石油大学引导性创新基金(2017YDL-03);“高档数控机床与基础制造装备”科技重大专项(2014ZX04014-031)。

摘　　要：目前,五轴数控机床伺服进给系统的动态误差研究大多偏向定性分析,难以满足动态误差辨识的需要。针对此问题,这里提出了一种能够定量分析伺服进给系统动态误差的新方法--延时连续法。首先,建立五轴数控机床平动轴和转动轴以及伺服电机系统的数学模型,调节位置环、消除代数环后得到完整的单轴机电耦合模型;其次,利用偶极子相消的方法获得了系统动态误差受输入影响的传递函数简化表达式,然后通过仿真分析证明了化简后函数的准确性,基于此简化函数提出了分析五轴机床伺服进给系统动态误差的延时连续法,并给出了其数学定义及相关表达式;最后通过仿真实验和理论计算结果的对比验证了延时连续法的有效性。At present,the dynamic error studies of the servo feed system for five-axis machine tools focus on the qualitative analysis,which is difficult to meet the needs of the dynamic error identification.For this issue,a new method for analyzing the dynamic error of servo feed system is proposed in this paper.Firstly,the mathematical model of the translational axis and rotary axis of the five-axis CNC machine tool and the servo motor system are established,and the complete single-axis electromechanical coupling model is obtained after adjusting the position loop and eliminating the algebraic loop.Secondly,the simplified expression of the dynamic error transfer function of the system is obtained by the method of dipole elimination.Then the accuracy of the simplified function is proved by simulation analysis.And the delay continuous method for analyzing the dynamic error of servo feed system is proposed based on this simplified function.Finally,the validity of the delay continuous method is verified by comparison between simulation experiments and theoretical calculations.

关 键 词：伺服进给系统 动态误差 机电耦合 延时连续法 

分 类 号：TH16[机械工程—机械制造及自动化] TH61