Method for compensating frictional error of servo system of numerical control machine tool

A friction error and friction compensation technology, which is applied in the field of friction error compensation for CNC machine tool servo systems, can solve the problems of limited compensation effect, strong changes in friction force, and short action time, and achieve the effect of realizing friction error compensation and shortening output.

Active Publication Date: 2011-04-20
XI AN JIAOTONG UNIV
View PDF6 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for the application conditions such as CNC machine tool servo system, the motion path has high motion speed and acceleration requirements, frequent speed changes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for compensating frictional error of servo system of numerical control machine tool
  • Method for compensating frictional error of servo system of numerical control machine tool
  • Method for compensating frictional error of servo system of numerical control machine tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The friction error compensation method of the CNC machine tool servo control system of the present invention comprises the following steps:

[0026] 1) First, the position interpolator 2 outputs a position command to the differential device, and the differential device calculates an input signal of a speed command according to the position command, and transmits it to the friction command generator 1;

[0027] 2) The friction command generator 1 calculates and generates the friction compensation command signal C according to the speed command input signal r ;

[0028] 3) The friction compensator 3 according to the friction compensation instruction signal C r The friction compensation value signal is calculated, and then the friction compensation value signal output by the friction compensator 3 is maintained by the first zero-order holder 5 under the sampling period determined by the first timer 7. The first zero-order holder 5 output feedforward compensation signal u...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a device and a method for compensating a frictional error of a servo system of a numerical control machine tool. Position feedback control and friction feedforward compensation are realized to further eliminate the frictional error by adopting a multi-sampling rate control structure of a discrete system. In the multi-sampling rate control structure, the sampling frequency of friction feedforward is required to be higher than that of position feedback. The multi-sampling rate control structure can realize a detailed friction feedforward compensation function in the position feedback under the condition of not changing the structure and stability of a servo feed control system. In the calculation of the amount of detailed friction feedforward compensation, the output of a position interpolator of the servo feed control system is utilized to obtain more detailed compensation speed instruction input by a linear interpolation method, and the amplitude change of a frictional force is predicted and the amount of the compensation is determined by adopting an exponential friction model. In the compensation method, the characteristics of the multi-sampling rate control structure and the structure of the servo system are fully utilized to improve the output accuracy and output frequency of the friction compensation, thereby achieving a more accurate friction compensation effect.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and relates to an error compensation method, in particular to a friction error compensation method for a servo system of a numerical control machine tool. Background technique [0002] Friction is a strong and unavoidable external disturbance factor in the servo feed system of CNC machine tools. The error phenomena caused by friction will seriously limit the realization of high-precision control of CNC machine tools. Therefore, the elimination and control of friction errors in servo systems has always been a hot and difficult point in the research of high-speed and high-precision numerical control technology. Due to the strong nonlinear characteristics of friction, it is difficult for the general linear feedback control method to solve the error characteristics of friction under high speed and commutation conditions. Using the feed-forward compensation method based on th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G05B19/404
Inventor 梅雪松刘栋陶涛冯斌张东升程有龙
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap