汽车工程 ›› 2023, Vol. 45 ›› Issue (5): 873-879.doi: 10.19562/j.chinasae.qcgc.2023.05.017

所属专题: 车身设计&轻量化&安全专题2023年

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基于复杂边界的牵引车车架疲劳研究

张宗阳,谢双双(),王凯,张玉鹏,邴涛,孙士涛   

  1. 中国重型汽车集团汽车研究总院,济南  250000
  • 收稿日期:2022-11-02 修回日期:2022-12-16 出版日期:2023-05-25 发布日期:2023-05-26
  • 通讯作者: 谢双双 E-mail:Sshuang0908@163.com

Fatigue Study of Tractor Frame Based on Complex Boundary

Zongyang Zhang,Shuangshuang Xie(),Kai Wang,Yupeng Zhang,Tao Bing,Shitao Sun   

  1. Institute of Automobile Research,China National Heavy Duty Truck Group Co. ,Ltd. ,Jinan  250000
  • Received:2022-11-02 Revised:2022-12-16 Online:2023-05-25 Published:2023-05-26
  • Contact: Shuangshuang Xie E-mail:Sshuang0908@163.com

摘要:

为提高车架疲劳寿命计算精度和在设计阶段对车架寿命进行准确预测,须考虑主结构外连点处动载荷对车架疲劳的影响及耦合作用,故本文中提出基于复杂边界的车架疲劳研究方法。通过试验场整车载荷谱采集,得到其全循环损伤值,基于损伤等效原理获得多种路面组合损伤值,与全循环损伤值等效精度为99.5%。构建主结构外连点的有限元车架模型,输出复杂边界的单位应力场;基于载荷谱、台架数据建立含有鞍座、拖车系统的高精度整车动力学模型,获取外连点处动载荷;由疲劳损伤理论计算车架疲劳,疲劳分析结果由试验场路试验证,结果表明基于复杂边界的车架模型仿真精度高,结合局部优化、模型重构使车架寿命满足要求。

关键词: 复杂边界, 动载荷, 损伤等效, 虚拟迭代, 寿命优化

Abstract:

In order to enhance the accuracy of frame fatigue life calculation and accurately predict the frame life in the design stage, it is necessary to consider the influence and coupling effect of the dynamic load on the fatigue of the frame at the outer connection point of the main structure. In this paper, a research method of frame fatigue based on complex boundary is proposed. The whole vehicle load spectrum is collected in the test field to obtain the whole cycle damage value. Based on the damage equivalent principle, the damage value of various surface road combinations is obtained, which is equivalent to the target value of the full cycle, with an accuracy of 99.5%. A finite element frame model with outer points of the main structure is constructed and the unit stress field of the complex boundary is output. The high-precision vehicle dynamics model with saddle and trailer system is established based on the test field load spectrum and the bench test data, to obtain the dynamic load of the outer connection point. The fatigue of the frame is calculated by the fatigue damage theory, with the fatigue analysis results verified by field tests. The results show that the frame model with the complex boundary has high simulation accuracy. Through local optimization and model reconstruction, the frame life can meet the requirements.

Key words: complex boundary, dynamic load, damage equivalence, virtual iteration, life optimization