摘要
针对某MPV车型开发过程中出现的地板加速3560r/min时振动过大的问题,对振动传递路径进行分析,并对地板及传递路径零部件进行振动数据采集,通过频谱分析确认振源为发动机二阶激励振动,传递路径是传动系统右驱动轴子系统。进一步对右驱动轴系统进行模态测试与分析,确认振动频率为已经实施单级动力吸振器的驱动轴系统二阶模态频率。在地板及驱动轴零部件结构无法更改的情况下提出了双级动力吸振器的改善方案,对比分析了单、双级动力吸振器数学理论模型,根据优化目标设计双级动力吸振器参数,并对优化前、后系统的频响函数进行仿真计算,预判了优化方案的有效性。最后试制样件,并搭载问题车辆进行对比测试,结果表明,地板振动问题得到明显改善,且证实了仿真结果的准确性。
In this paper,aiming at the problem of excessive vibration of the floor when the floor is accelerated to 3560 r/min during the development of an MPV model,the vibration transmission path is analyzed and the vibration data of the floor and the components of the transmission path are collected.The frequency spectrum analysis confirms that the vibration source is the second-order excitation of the engine vibration,the transmission path is the right drive shaft subsystem of the transmission system.The modal test and analysis of the right drive shaft system were further carried out,and it was confirmed that the vibration frequency was the second-order modal frequency of the drive shaft system that had implemented the single-stage dynamic vibration absorber.Under the condition that the structure of the floor and drive shaft components cannot be changed,an improvement plan for the two-stage dynamic vibration absorber is proposed,and the mathematical theoretical models of the single-stage and two-stage dynamic vibration absorber are compared and analyzed.The simulation calculation of the frequency response function of the system before and after optimization predicts the effectiveness of the optimization scheme.Finally,the prototype was trial-produced and the vehicle in question was carried for comparative testing.The results showed that the floor vibration problem was significantly improved and the accuracy of the simulation results was confirmed.
作者
陈翔
刘学文
黄南棋
CHEN Xiang;LIU Xuewen;HUANG Nanqi(Liuzhou Kaiyue Technology Company Limited,Liuzhou 545000,China;Dongfeng Liuzhou Motor Company Limited,Liuzhou 545000,China)
出处
《汽车实用技术》
2022年第12期107-113,共7页
Automobile Applied Technology
关键词
振动传递路径
频谱分析
模态测试
动力吸振器
频响函数
MPV
Vibration transmission path
Spectrum analysis
Modal testing
Dynamic vibration absorber
Frequency response function
MPV
