Body-in-white welding spot optimization method based on variable density method and fatigue life analysis

A technology of fatigue life analysis and optimization method, applied in instruments, calculations, combustion engines, etc., can solve the problems of difficult solder joint layout, inaccurate fatigue life analysis, etc., to improve modal performance, reduce design variables, and reduce solder joints effect of quantity

Pending Publication Date: 2019-09-27
NANJING UNIV OF SCI & TECH
View PDF1 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for optimizing the solder joints of the body-in-white based on the variable densit

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
  • Body-in-white welding spot optimization method based on variable density method and fatigue life analysis
  • Body-in-white welding spot optimization method based on variable density method and fatigue life analysis
  • Body-in-white welding spot optimization method based on variable density method and fatigue life analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Such as figure 1 As shown, a method for optimizing solder joints of body-in-white based on variable density method and fatigue life analysis, the specific steps include:

[0064] Step 1: Establish the finite element analysis model and the solder joint finite element analysis model according to the modeling standard according to the 3D model of a commercial vehicle. The solder joint establishment type adopts ACM, and its structure is as follows figure 2 shown. The ACM unit is composed of several groups of rbe3 units on the surface and a solid unit in the middle. Its structure is as follows image 3 shown. A total of 437189 grid cells were established. 97371 solder joints.

[0065] Step 2: Divide the established solder joints into zones according to the degree of influence on the performance of the first-order torsional mode of the body-in-white. Partition results such as figure 2 hint. The front solder joint with a large proportion of low-order vibration is reg...

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 body-in-white welding spot optimization method based on a variable density method and the fatigue life analysis, and the method comprises the specific steps of building a finite element model of a whole vehicle, and building a body-in-white welding spot finite element model; partitioning the established body-in-white welding spot model according to the modal influence weight; establishing a welding spot topological optimization calculation model based on the variable density method partition; applying an inertia release method to the body-in-white welding spot model after topology optimization, and taking a load spectrum of virtual iteration as excitation; calculating the stress distribution around a welding spot under excitation, and analyzing the fatigue life of the welding spot to predict the potential risk of the welding spot; and carrying out position and number optimization adjustment on a welding spot area with insufficient fatigue life. According to the method, the number of the body-in-white welding spots is reduced through the topological optimization, the body-in-white light target is achieved, the design variables of the fatigue life analysis are reduced, the calculation efficiency is improved, and the method plays a key role in improving the body-in-white rigidity and the modal performance.

Description

technical field [0001] The invention relates to the field of automobile body optimization, in particular to a method for optimizing solder joints of a body in white based on a variable density method and fatigue life analysis. Background technique [0002] As the carrier of a passenger car, the body must have sufficient strength to ensure its fatigue life and sufficient rigidity to meet its assembly and use requirements. At the same time, it should have reasonable dynamic characteristics to control vibration and noise. In the finite element method, the body is described by shell elements, but the welding points of the body itself are difficult to simulate, especially the arrangement of the welding points. The welding point layout of the traditional welding process, due to the existence of surplus or insufficient welding points, leads to increased welding transfer costs or insufficient rigidity. Therefore, it has become a key technology to rationally arrange the number and ...

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
CPCG06F30/23G06F30/15Y02T10/40
Inventor 王良模张江帆王陶孙会明孙鹏程陈刚
Owner NANJING UNIV OF SCI & TECH
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