某前悬架下摆臂疲劳失效分析与优化  

Fatigue Failure Analysis and Optimization of a Front Suspension Lower Arm

作　　者：梁国栋[1] 程乐[2] LIANG Guo-dong;CHENG Le(School of Electromechanical Engineering,Heyuan Polytechnic,Guangdong Heyuan 517000,China;School of Computer&Communication Engineering,Huai'an College of Information Technology,Jiangsu Huai'an 223003,China)

机构地区：[1]河源职业技术学院机电工程学院,广东河源517000 [2]淮安信息职业技术学院计算机与通信工程学院,江苏淮安223003

出　　处：《机械设计与制造》2022年第3期292-295,共4页Machinery Design & Manufacture

基　　金：江苏省高校自然科学研究项目(16KJB520049)。

摘　　要：针对某前悬架下摆臂路试疲劳失效问题,首先建立下摆臂有限元模型和前悬架动力学模型,提取极限制动工况时的载荷,采用惯性释放方法对其进行极限强度分析,分析结果表明其应力幅值接近于材料屈服限值,存在疲劳失效风险。然后搭建下摆臂台架试验对其进行对标分析,分析结果表明其仿真分析的误差率为4.3%。再基于极限载荷和正弦波激励对下摆臂进行疲劳分析,分析结果表明其疲劳寿命小于规定要求,并且其危险位置与失效位置相同。再采用集成平台对下摆臂进行多目标优化设计,优化之后其强度安全系数达到要求,其疲劳寿命达到目标值,并且其重量减轻6.5%。最后对下摆臂优化方案进行台架试验和整车道路耐久试验,试验结果表明其具有较高的可靠度。Aiming at solving a front suspension lower arm fatigue failure problem.Firstly,the lower arm finite element model and front suspension dynamic model were established,the load of extreme braking was extracted,the lower arm was extreme strength analyzed by adopting inertial release method,the analysis results show that its stress amplitude was close to the material yield limit,the risk offatigue failure would be produced.Secondly,the lower arm was benchmark analyzed based on bench test,the analysis results show that its error rate of simulation analysis was 4.3%.The Lower arm was fatigue analyzed based on extreme load and sine wave excitation,the analysis results show that its fatigue life was less than required,and its danger position was the same as the failure position.Thirdly,the lower arm was multi-objective optimization designed by adopting integration platform,its strength safety factor could meet the requirements,its fatigue life could meet the target,and its weight had deduced by 6.5%.Lastly,the lower arm was bench tested and vehicle road durability tested,the test results show that it had high reliability.

关 键 词：下摆臂 失效 极限强度 台架试验 疲劳寿命 优化设计 

分 类 号：TH16[机械工程—机械制造及自动化] U463.1[机械工程—车辆工程]