基于传递路径的整车底板振动优化方法  

Improvement Method of Vehicle Floor Vibration Based on Transfer Path Analysis Method

作　　者：刘雪莱 赵阳阳[1] 王东[1] LIU Xuelai;ZHAO Yangyang;WANG Dong(SAIC Motor Corporation Technical Center Shanghai,201804,China;School of Mechanical and Automotive Engineering,South China University of Technology Guangzhou,510640,China)

机构地区：[1]上海汽车集团股份有限公司技术中心,上海201804 [2]华南理工大学机械与汽车工程学院,广州510640

出　　处：《振动．测试与诊断》2023年第6期1169-1175,1247,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：上海汽车集团股份有限公司技术中心研发资助项目。

摘　　要：针对搭载软连接副车架车型在加速时产生的底板振动开展研究。首先,通过整车试验定位引起该问题的激励源;其次,基于扩展工况传递路径分析方法对动力总成与底板间的各条路径对振动的贡献量进行分析,并结合模态试验结果,识别出引起振动的主要路径和关键部件;然后,建立包含动力总成和副车架的12自由度模型,仿真得到单位激励条件下关键路径衬套的支反力;最后,以降低支反力为目标对副车架与车身连接衬套的刚度进行优化设计,并进行了整车试验验证。结果表明:动力总成激励与副车架刚体模态耦合引起了副车架共振及底板振动,副车架与车身连接的两个后衬套是振动传递的关键路径,优化后实车底板振动峰值下降超过30%。Floor vibration is a classic vibration phenomenon during the running process of vehicle.In this paper,the excitation source which cause floor vibration is identified by experimental method.The contribution of each transfer path between the powertrain and the vehicle floor to the vibration is analyzed by extended condition transfer path analysis method.Furthermore,the main paths and important components causing vibration are identified.A dynamic model with 12 degrees of freedom is established.The dynamic response of the model and reaction force of bushing is calculated.The stiffness of bushing is optimized for reducing the floor vibration based on the calculated results of reaction force.Floor vibration are measured for the baseline bushing and the im‑proved bushing.The results show that floor vibration is mainly caused by the rigid body mode of subframe.The peak value of vibration is decreased by more than 30%after the stiffness optimization of the bushing.

关 键 词：传递路径分析 底板振动 动力学建模 系统优化 扩展工况传递路径分析 

分 类 号：TH113[机械工程—机械设计及理论] TB53[理学—物理]