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快速刀具伺服系统位置域重复控制设计及其数字实现

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在非圆零件车削过程中,快速刀具伺服(Fast tool servo,FTS)的运动精度直接影响零件的加工质量。主轴变速加工使得FTS的参考目标信号周期时变而不确定,这对实现其渐近跟踪提出了极大的挑战。本文利用FTS的位置域周期特性,提出一种基于位置域重复控制和时域速度反馈镇定的FTS系统复合控制设计方法,并给出位置域改进型重复控制器(Spatial modified repetitive controller,SMRC)的数字实现算法,实现对时变周期参考目标信号的高精度跟踪。首先,建立包含位置相关时变周期参考目标信号内模的SMRC,并引入位置域相位超前装置对镇定补偿器引起的相位滞后进行补偿,在此基础上构建复合控制律。然后应用小增益定理和算子理论,推导出控制系统的稳定性条件,在保持系统采样频率不变的条件下,应用插值法建立SMRC的数字实现算法,确保位置域重复控制和时域镇定控制器的同步执行。最后,通过仿真验证所设计的FTS控制系统具有满意的时变周期跟踪性能和鲁棒性,并通过与其他位置域重复控制方法的比较,说明所提方法同时具有更好的暂态和稳态性能。
Design and Digital Implementation of Spatial Repetitive Control for Fast Tool Servo System
The motion accuracy of the fast tool servo(FTS)directly affects the machining quality of the non-circu-lar parts.In variable spindle speed machining,the period of the reference signal of the FTS is time-varying and un-certain,which poses a great challenge to achieve its asymptotic tracking.In this paper,we propose a composite con-trol design method based on spatial repetitive control and temporal velocity feedback stabilization for an FTS sys-tem,and present a digital implementation algorithm of the spatial modified-repetitive-controller(SMRC)to achieve high-precision tracking of time-varying periodic reference signals.First,an SMRC with the internal mode of the pos-ition-dependent time-varying periodic reference input signal is constructed,in which a phase-lead alignment seg-ment is used to compensate for the phase lag caused by the temporal stabilization controller.And based on this,a composite control law is established.Then,the stability criteria of the control system are derived using the small gain theorem and operator theory.A digital implementation algorithm of the SMRC is developed to ensure the syn-chronous execution of the SMRC and the temporal stabilization controller through a regular fixed time sampling.Finally,simulation results show that the designed FTS control system has satisfactory time-varying-period tracking performance and robustness.A comparison with other spatial repetitive control methods verifies that the proposed method achieves better performance in both transient and steady state aspects.

Fast tool servo(FTS)time varying periodic signalrepetitive controlposition domaindigital imple-mentation

周兰、杨秦、潘昌忠、肖文彬、李美柳

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湖南科技大学信息与电气工程学院 湘潭 411201

快速刀具伺服 时变周期信号 重复控制 位置域 数字实现

国家自然科学基金国家自然科学基金国家自然科学基金湖南省重点研发计划项目湖南省自然科学基金湖南省自然科学基金湖南省自然科学基金湖南省教育厅科研项目湖南省教育厅科研项目湖南省教育厅科研项目湖南省研究生科研创新项目

6237314562173138623031792023GK20272021JJ300062023JJ402972023JJ4029521A032122B046822C0244CX20221055

2024

自动化学报
中国自动化学会 中国科学院自动化研究所

自动化学报

CSTPCD北大核心
影响因子:1.762
ISSN:0254-4156
年,卷(期):2024.50(7)