FATIGUE LIFE ANALYSIS OF THE FRAME OF A SEMI TRAILER SPECIAL VEHICLE (MT)

WU Wei; SHI QiJun; WANG Lei; HAN LuMing; WAN ZhiMin

doi:10.16579/j.issn.1001.9669.2023.02.031

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FATIGUE LIFE ANALYSIS OF THE FRAME OF A SEMI TRAILER SPECIAL VEHICLE (MT)

更新时间：2023-06-09

- FATIGUE LIFE ANALYSIS OF THE FRAME OF A SEMI TRAILER SPECIAL VEHICLE (MT)
- Journal of Mechanical Strength Issue 2, Pages: 481-487(2023)
- 作者机构：
  
  1. 南通职业大学
  2. 南通科技职业学院
  3. 北奔重型汽车集团有限公司技术中心
  4. 远景能源有限公司
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2023.02.031
  CLC：
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WU Wei, SHI QiJun, WANG Lei, et al. FATIGUE LIFE ANALYSIS OF THE FRAME OF A SEMI TRAILER SPECIAL VEHICLE (MT). [J]. Journal of Mechanical Strength (2):481-487(2023)
DOI：

WU Wei, SHI QiJun, WANG Lei, et al. FATIGUE LIFE ANALYSIS OF THE FRAME OF A SEMI TRAILER SPECIAL VEHICLE (MT). [J]. Journal of Mechanical Strength (2):481-487(2023) DOI： 10.16579/j.issn.1001.9669.2023.02.031.

摘要

针对大型特种半挂车架可靠性分析严重依赖样车的问题，提出了基于频域信息的随机载荷历程估算结构振动疲劳的方法。首先通过车架的模态与静载试验对比，验证了车架分析模型的正确性；然后进行频率响应计算得到传递函数，结合车架动载功率谱密度获得结构的应力功率谱密度；最后结合材料参数选择合适的疲劳损伤模型，利用频域方法预测车架结构的疲劳缺陷部位和寿命。通过疲劳试验验证了预测结果可信，为特种车架结构设计与改进提供更可信的方案。

Abstract

In order to solve the problem that the reliability analysis of special semitrailer frame depends heavily on the sample vehicle, a calculation method of structural vibration fatigue estimation based on random load history in frequency domain is proposed. Firstly, the correctness of the frame analysis model is verified through the comparative analysis of the frame modal and static load test; Then the frequency response is calculated to obtain the transfer function, and the stress power spectral density of the structure is obtained by combining with the dynamic load power spectral density of the frame; Finally, according to the material parameters, the appropriate fatigue damage model is selected, and the frequency domain method is used to predict the fatigue defect location and life of the frame structure. Through the fatigue test, the predicted results are credible, which provides a more credible scheme for the design and improvement of special frame structure.

关键词

车架多体动力学频域疲劳寿命试验

Keywords

FrameMultibody dynamicsFrequency domainFatigue lifeTest

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