主办：陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊：1976年
汽车实用技术

汽车实用技术 ›› 2026, Vol. 51 ›› Issue (5): 60-64.DOI: 10.16638/j.cnki.1671-7988.2026.005.012

• 设计研究 • 上一篇    

基于模态应力法的某厢型车车身疲劳分析

潘振 1,2，王乾勋 1,2，崔震 1,2，韩辉 1,2，甄学聪 1,2，王清涛 1,2   

  1. 1.山东五征集团有限公司； 2.合智数创（山东）科技开发有限公司
  • 发布日期:2026-03-11
  • 通讯作者: 潘振
  • 作者简介:潘振（1994－），男，硕士，工程师，研究方向为车辆多体动力学 CAE 仿真
  • 基金资助:
    日照市重点研发计划资助（2025ZDYF0102）

Fatigue Analysis of a Van Body Based on Modal Stress Method

PAN Zhen1,2 , WANG Qianxun1,2 , CUI Zhen1,2 , HAN Hui1,2 , ZHEN Xuecong1,2 , WANG Qingtao1,2   

  1. 1.Shandong Wuzheng Group Company Limited; 2.Intelligence Integration & Numerical Innovation (Shandong) Company Limited
  • Published:2026-03-11
  • Contact: PAN Zhen

PDF

摘要： 当前业内普遍采用的准静态疲劳分析方法，流程简单、资源占用率低，但无法考虑模 态对疲劳损伤的影响，当结构固有频率和外载频率接近时，便无法准确预测疲劳寿命。文章 以某厢型车为研究对象，基于模态应力恢复法，以虚拟试验场（VPG）技术获得车身各阶模 态坐标为输入，通过疲劳软件对车身进行疲劳寿命预测。结果表明，基于模态应力恢复的疲 劳分析可准确识别实际失效位置，该方法可在产品研发阶段准确预估车身疲劳寿命，为车身 设计及结构优化提供理论依据。

关键词: 疲劳分析；虚拟试验场；模态应力；模态坐标

Abstract: The quasi-static fatigue analysis method widely adopted in the industry features a simple workflow and low resource consumption, yet fails to account for modal effects on fatigue damage. When the natural frequency of a structure approaches the frequency of external loads, it becomes incapable of accurately predicting fatigue life. This article takes a certain sedan as the research object. Based on the modal stress recovery method, using the virtual proving ground (VPG) technology to obtain the modal coordinates of the vehicle body at each stage as the input, the fatigue software is used to predict the fatigue life of the vehicle body. The results show that the fatigue analysis based on modal stress recovery can accurately identify the actual failure location. This method can accurately predict the fatigue life of the vehicle body during the product development stage, providing a theoretical basis for vehicle body design and structural optimization.

Key words: fatigue analysis; virtual proving ground; modal stress; modal coordinate