虚拟迭代法转向节载荷谱提取与验证  

EXTRACTION AND VERIFICATION OF LOAD SPECTRUM OF STEERING KNUCLE BASED ON VIRTUAL ITERATION METHOD

作　　者：董国疆[1] 王威[1] 杜飞 郎玉玲 DONG GuoJiang;WANG Wei;DU Fei;LANG YuLing(College of Vehicle and Energy,Yanshan University,Hebei Key Laboratory of Special Delivery Equipment,Qinhuangdao 066004,China;CITIC Dicastal Co.,Ltd.,Qinhuangdao 066004,China)

机构地区：[1]燕山大学河北省特种运载装备重点实验室,秦皇岛066004 [2]中信戴卡股份有限公司工程仿真中心,秦皇岛066004

出　　处：《机械强度》2020年第6期1323-1331,共9页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51775481)资助。

摘　　要：汽车底盘零部件载荷谱是分析构件疲劳、可靠性和耐久性的关键要素,但是在实车强化道路载荷谱提取流程,关键环节处理以及误差评估等方面仍需进一步实践和直接验证。基于此,以某型汽车转向节为研究对象,建立整车刚柔耦合多体动力学仿真模型,通过试验场强化道路试验校准,对标实测关键点监测信号与迭代仿真的误差小于30%,验证了整车多体模型的响应精度;实车采集试验场耐久性测试强化路面载荷谱,运用虚拟迭代法进行仿真分解获取转向节连接点载荷谱;以石块路丙和搓板路典型工况为例,采用惯性释放法将连接点载荷谱作为输入激励,求解转向节时域应变场,获取监测点应变时域曲线,对比实测信号分析相对误差小于20%,满足载荷谱后续使用的精度要求。研究表明,应变标定法是对虚拟迭代载荷谱提取效果的直接验证,证明了载荷谱提取技术路线的可行性和精确度,为汽车底盘零部件的开发和疲劳耐久性分析验证提供参考依据。The load spectrum of automotive chassis components is the key factor to analyze the fatigue,reliability and durability of components.However,it still needs further practice and direct verification in the process of extracting road load spectrum and the key link processing,as well as error evaluation,etc.Based on this,this paper takes a certain type of automobile steering knuckle as the research object,established rigid-flexible coupling multi-body dynamic simulation model of the whole vehicle,and calibrated it through the test site reinforced the road test,the error between the monitoring signal of the measured key points and the iterative simulation is less than 30%,which verifies the response accuracy of the vehicle multi-body model;The load spectrum of road surface strengthened by endurance test of real vehicle was collected,and the load spectrum of steering knuckle connection points was obtained by simulation decomposition using virtual iteration method;Take typical working conditions of stone road Cand washboard road as examples,the inertia release method was used to solve the time-domain strain field of steering knuckle by using the load spectrum of connection points as input excitation,and time-domain strain curves of monitoring points are obtained,the relative error of the analysis of measured signals is less than 20%,which meets the accuracy requirements of the subsequent use of the load spectrum.The results show that strain calibration method is a direct verification of the effect of virtual iteration load spectrum extraction,which proves the feasibility and accuracy of the load spectrum extraction technical route,and provides a reference for the development of automobile chassis parts and fatigue durability analysis and verification.

关 键 词：载荷谱 刚柔耦合多体模型 虚拟迭代 转向节 

分 类 号：U463.1[机械工程—车辆工程]