摘要
对某汽车车门关闭过程中产生的疲劳失效问题进行了研究。首先,对车门关闭工况下的瞬态冲击载荷进行离散化处理,通过整车和台架实验分别采集振动加速度响应信号和频率响应函数,从而利用传递路径分析(transfer path analysis, TPA)方法计算得到离散化瞬态冲击载荷。其次,将求取的瞬态冲击载荷输入至车门有限元模型中,进而获得关门工况下的应力-时间历程响应云图,进一步由疲劳损伤理论计算车门关闭工况下的疲劳寿命。最后,将基于载荷识别的疲劳分析结果、基于显式动力学的疲劳分析结果以及车门关闭工况下的疲劳实验结果进行对比验证,结论表明三者结果一致性较好,验证了该方法的合理性。
A study is conducted on the fatigue failure problem caused by the opening and closing of a car door.Firstly,the transient impact load under the door closing condition is discretized,and the vibration acceleration response signal and frequency response function are collected through the whole vehicle and bench tests respectively.Thus,the transfer path analysis(TPA)method is used to calculate the discretized transient impact load.Secondly,the obtained transient impact load is input into the finite element model of the door,and then the stress-time history response cloud diagram under the door closing condition is obtained,and the fatigue life under the door opening and closing condition is further calculated based on the fatigue damage theory.Finally,the fatigue analysis results based on load identification,the fatigue analysis results based on explicit dynamics and the fatigue test results under the door closed condition are compared and verified with each other.The conclusion shows that the three results are consistent,which has verified the rationality of the method.
作者
刘哲
李辉
高大威
高云凯
Liu Zhe;Li Hui;Gao Dawei;Gao Yunkai(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093;School of Automotive Studies,Tongji University,Shanghai 201804)
出处
《汽车工程》
EI
CSCD
北大核心
2024年第8期1529-1536,1519,共9页
Automotive Engineering
基金
国家自然科学基金(52175239,52305244,52105271)
安徽省自然科学基金(2308085QE158)资助。
关键词
车门
瞬态响应
疲劳耐久
有限元法
vehicle door
transient response
fatigue durability
finite element method
