精密直线伺服装置数字预见控制器设计  

Digital Preview Controller Design for Precision Linear Servo Device

作　　者：黄世涛[1] 冯之敬[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084

出　　处：《机床与液压》2007年第3期25-27,共3页Machine Tool & Hydraulics

基　　金：清华大学校企合作项目(2002186)

摘　　要：直线伺服装置是实现非圆截面类零件数控车削加工的关键,针对其加工目标轨迹已知的特点,本文基于二次型最优控制理论设计了直线伺服装置数字预见控制器。该控制器由一个具有PI-PD形式的最优状态反馈控制器和预见前馈补偿器构成。为了进一步克服外部干扰、模型误差和参数变化对预见控制的影响,提出了一个离散时域扰动观测器。仿真结果表明,该控制方法能够满足高速高精度条件下对非圆截面零件的车削加工要求。Linear servo device is the key to NC turning for work-pieces with noncircular profile, with the characteristics that its cutting target trajectory has been known. A digital preview controller was proposed for linear servo system, based on linear quadric optimal control scheme. The controller consists of a optimal state feedback controller with a style of PI-PD, and a preview feedforward componsator. A discrete time disturbance observer was presented to suppress the external disturbances, modeling error, and parameter variation, which have effects on the digital preview control. The simulation results show that the control scheme can meet the requirements for turning work-pieces with noncircular profile in condition of high speed and high accuracy.

关 键 词：数字预见控制 鲁棒控制 扰动观测器 非圆加工 

分 类 号：TG51[金属学及工艺—金属切削加工及机床]