Repetitive control and its application to linear servo unit for CNC machining of elliptical pistons

Author

Zhou, Huixing ; Zhang, Lima ; Wang, Xiankui ; Liu, Jinling

Author_Institution

Dept. of Precision Instrum., Tsinghua Univ., Beijing, China

fYear

1996

fDate

2-6 Dec 1996

Firstpage

630

Lastpage

633

Abstract

In this paper, the basic theory of repetitive control are summarized and modified repetitive controllers are introduced. The steady-state error and asymptotic stability condition are presented. A CNC precision lathe implemented with the repetitive control system for machining elliptical pistons is constructed, which consists of a precision linear servomechanism, computer controlled repetitive controller and machine-tool. The cutting tool driven directly by the linear servomechanism in radial direction of the piston tracks the section curve of the piston. Compared with the machining results performed by a traditional piston CNC machine-tools with PID regular, the tracking error given by the proposed control method was reduced by 40%

Keywords

asymptotic stability; closed loop systems; computerised numerical control; feedback; machine tools; servomechanisms; tracking; transfer functions; CNC machining; asymptotic stability; closed loop systems; elliptical pistons; feedback; linear servomechanism; machine-tool; repetitive control; steady-state error; tracking; transfer function; Asymptotic stability; Computer errors; Computer numerical control; Control systems; Cutting tools; Machining; Pistons; Servomechanisms; Steady-state; Three-term control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Technology, 1996. (ICIT '96), Proceedings of The IEEE International Conference on

Conference_Location

Shanghai

Print_ISBN

0-7803-3104-4

Type

conf

DOI

10.1109/ICIT.1996.601668

Filename

601668