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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2472-08
扭力梁疲劳寿命与减振器阻尼关系的研究
周兵1,曾凡沂1, 2,吴晓建1, 3,崔庆佳1,龙乐飞1,陈晓龙1

(1.湖南大学 汽车车身先进设计制造国家重点实验室,湖南 长沙,410082;
2. 广州汽车集团股份有限公司汽车工程研究院,广东 广州,510640;
3. 南昌大学 机电工程学院,江西 南昌,330031
)

摘 要: 为了研究扭力梁式悬架中扭力梁疲劳寿命受减振器阻尼的影响关系,首先基于物理机理建立了减振器阻尼力与阀片厚度、阀片片数等结构参数之间的数学模型,反映减振器的工作特性;基于减振器结构参数的灵敏度分析确认减振器阻尼特性调节方法;建立刚柔耦合的整车四立柱模型,并通过实验验证模型的准确性;在此基础上,将减振器模型应用于刚柔耦合的扭力梁汽车整车四立柱模型中,根据调节方法改变减振器结构参数,分析不同阻尼特性下扭力梁的疲劳寿命,得到扭力梁疲劳寿命-减振器阻尼特性关系曲线。研究结果表明:减振器阻尼特性调节方法与企业的实际调节措施一致,并且在兼顾安全性和平顺性的阻尼系数范围内,随着阻尼系数的增大,扭力梁最小疲劳寿命随之增大,而当到达一定的阻尼系数之后,阻尼系数的变化对扭力梁疲劳寿命几乎不产生影响。

 

关键字: 扭力梁;减振器阻尼;疲劳寿命;减振器

Study of relationship between fatigue life of torsion beam and shock absorber damping
ZHOU Bing1, ZENG Fanyi1, 2, WU Xiaojian1, 3, CUI Qingjia1, LONG Lefei1, CHEN Xiaolong1

1. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China;
2:Guangzhou Automotive Group Co. Ltd., Automotive Engineering Institute, Guangzhou, 510640, China;
3. School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China

Abstract:In order to study the relationship between the fatigue life of the torsion beam and the shock absorber damping, the mathematical model about the damping force of the shock absorber with the thickness of the valve plate and the number of valves based on the physical mechanism was set up, which can reflect accurately the operating characteristics of the shock absorber. The sensitivity analysis based on the structural parameters of the damper was done to confirm the adjustment method of the damping characteristics of the damper; The four column model of rigid flexible coupling was established, and the accuracy of the model was verified by experiments, and then the shock absorber model was applied to the rigid flexible coupling torsion beam vehicle four column model, with the structural parameters of the damper changed according to the adjusting measures. Moreover, the curve depicting the relationship between the fatigue life of the torsion beam and damping characteristics of shock absorber can be obtained by analyzing the fatigue life of torsion beam under different damping characteristics. The adjustment method of the damping characteristics of the damper is consistent with the actual adjustment measures as the results show. The results show that within the range of the damping coefficient in consideration of safety and smooth, the minimum fatigue life of torsion beam increases with the increase of the damping coefficient, and after it reaches a certain value, the change of the damping coefficient has little effect on the fatigue life of the torsion beam.

 

Key words: torsion beam; shock absorber damping; fatigue life; shock absorber

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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