基于动态特性试验的半挂车架疲劳分析  

FATIGUE LIFE ANALYSIS OF THE FRAME OF A SEMI TRAILER SPECIAL VEHICLE

作　　者：吴炜[1] 石启军 王磊[3] 韩鲁明 万志敏 WU Wei;SHI QiJun;WANG Lei;HAN LuMing;WAN ZhiMin(Nantong Vocational University,Nantong 226007,China;Nantong College of Science And Technology,Nantong 226007,China;Technical Center of Beiben Trucks Group Co.,Ltd.,Baotou 014000,China;Envision Group Co.,Ltd.,Shanghai 200051,China)

机构地区：[1]南通职业大学,南通226007 [2]南通科技职业学院,南通220600 [3]北奔重型汽车集团有限公司技术中心,包头014000 [4]远景能源有限公司,上海200051

出　　处：《机械强度》2023年第2期481-487,共7页Journal of Mechanical Strength

基　　金：中国电子科技集团有限公司第14研究所项目(1701460);南通市科技计划项目(JC22022079);江苏省高等学校自然科学研究面上项目(19KJD14003);南通职业大学自然科学研究重点项目(20ZK02)资助。

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。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 

分 类 号：TH114[机械工程—机械设计及理论]