A load extrapolation method for CNC machine tools based on time-domain load expansion

Active Publication Date: 2019-04-02
JILIN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems that the current traditional time-domain load extension method does not consider the difference in the tim

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
  • A load extrapolation method for CNC machine tools based on time-domain load expansion
  • A load extrapolation method for CNC machine tools based on time-domain load expansion
  • A load extrapolation method for CNC machine tools based on time-domain load expansion

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0107] Below in conjunction with accompanying drawing, the present invention is described in detail:

[0108] see figure 1 , a kind of load extrapolation method of CNC machine tool based on time-domain load expansion according to the present invention is composed of time-domain load expansion method based on MCMC, using MEF diagram to determine the range of the threshold value, selecting and obtaining the optimal threshold value based on grey correlation analysis The extrapolated time domain load and other steps are composed.

[0109] (1) Time-domain load expansion method based on MCMC

[0110] Step1 Extract the extreme value and lift of the load in the time domain

[0111] see figure 2 , and extract the turning point of the measured load time history of the CNC machine tool as the extreme load time series. When extracting the load turning point, it is necessary to eliminate the invalid load cycles. The variable range threshold model is used for selection. After eliminat...

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 relates to a technical method applied to the field of load spectrums of numerical control machine tools, in particular to a time domain load extension-based load extrapolation method for a numerical control machine tool, and solves the problem that a conventional time domain load extension method does not consider difference of time intervals of an extreme load and selection of an optimal extreme value threshold at present. The method comprises the following steps of 1, adopting an MCMC-based time domain load extension method; 2, determining a threshold range by utilizing an MEF graph; 3, selecting an optimal threshold based on grey relational analysis; and 4, obtaining an extrapolated time domain load. According to the method, the time interval between adjacent extreme values of a cutting load is fully considered, the time domain load can be extended more accurately, grey correlation degrees of GPD fitting of overshoots corresponding to different thresholds are subjected to comparative analysis through the grey relational analysis method, and the threshold corresponding to the GPD fitting with the maximum grey correlation degree is selected as the optimal threshold.

Description

technical field [0001] The invention relates to a technical method applied in the field of load spectrum of a numerically controlled machine tool, more precisely, the invention relates to a method for extrapolating time domain load POT on the basis of expanding the time domain load of a numerically controlled machine tool. Background technique [0002] The load spectrum is the load time history of the whole machine or parts of the product. Because it can reflect the change law of random loads, the load spectrum is widely used in the reliability test of the component structure, fatigue life prediction, reliability design, and accelerated test. etc. [0003] CNC machine tools have different cutting loads under different cutting conditions and working modes. Compared with other mechanical products, their loads are more complex and changeable. In addition, CNC machine tools themselves do not have the function of load testing. If the corresponding testing device is installed, it ...

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): G06F17/50
CPCG06F30/17
Inventor 何佳龙李国发王升旭张建成杨兆军陈传海陈菲王继利
Owner JILIN 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