基于道路载荷谱的副车架疲劳分析及优化  

The Fatigue life analysis and optimization of subframe based on road load spectrum

作　　者：李金龙[1] 高翔[1] 冯毅[1] 周佳[1] 万鑫铭[1] LI Jinlong;GAO Xiang;FENG Yi;ZHOU Jia;WAN Xinming(China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China)

机构地区：[1]中国汽车工程研究院股份有限公司,重庆401122

出　　处：《现代制造工程》2022年第5期50-55,共6页Modern Manufacturing Engineering

基　　金：国家重点研发计划项目(2016YFB0101607);重庆市“科技创新领军人才支持计划”项目(cstccxljrc201901)。

摘　　要：使用杂合车安装路谱采集传感器,采集耐久试验场路谱载荷。基于实测试验场载荷谱数据,建立整车多体动力学模型进行虚拟载荷迭代,得到副车架各连接点上的载荷时间历程曲线。建立副车架有限元模型计算得到结构的强度计算结果,再结合载荷时间历程曲线通过FEMFAT软件计算得到副车架疲劳损伤结果。对不满足疲劳耐久性能要求的结构进行优化,修改后结构有效降低了疲劳损伤值,最终满足疲劳损伤设计要求。基于该流程可以在研发设计阶段发现副车架结构的疲劳设计薄弱点,大大缩短开发周期、节省试验开发成本。The spectrum load data were collected in the fatigue endurance test site by installing the spectrum sensing equipment on the mule car.The multi-body dynamics model of the vehicle was established, and the virtual load iteration was carried out based on the measured test field load spectrum data.The load time history curves of each connection point of the subframe were obtained through virtual load iteration.The finite element model of the subframe was established to calculate the strength of the structure.Combined with the load time history curve, the fatigue damage results of the subframe were calculated by FEMFAT software.According to the experience, the structure which does not meet the requirements of fatigue durability was optimized.The modified structure finally meets the fatigue damage design requirements.Based on this process, the weak points of fatigue design of subframe structure can be found in the development and design stage.According to this process can greatly shorten the development cycle and save the cost of test development.

关 键 词：道路载荷谱 载荷迭代 副车架 疲劳分析 

分 类 号：TH16[机械工程—机械制造及自动化]