摘要
某越野车车型在加速行驶至90-120 km/h时,主驾座椅振动明显并伴有轰鸣声,严重影响整车舒适性.针对该问题运用道路车内振动测试分析、模态试验分析、CAE仿真分析等方法对座椅的振动原因进行分析,确定该振动问题主要贡献频率为15 Hz和60 Hz.15 Hz主要激励源为轮胎一阶激励,且座椅存在15.2 Hz前后摆动模态振型与轮胎一阶激励产生共振;60 Hz主要激励源为传动系统工作一阶激励频率,主要受传动系统动不平衡影响.综合考虑成本、周期等因素,采用对座椅骨架结构加强和优化传动轴动不平衡量两个方案,结果120 km/h匀速行驶工况下座椅导轨振动幅值降低45%.经主观评价,座椅振动消失,改善明显,可接受.
There is a fierce vibration of the front seat on an off-road vehicle during the speed from 90 km/h to 120 km/h.It seriously affects the vehicle comfort.Aiming at this problem,the vibration sources of the seats were analyzed by means of road vehicle vibration test,modal analysis and CAE simulation,and the main contribution frequencies of the vibration problem were determined to be 15 Hz and 60 Hz.The main driving source of 15 Hz is the first order tire drive,and the seat has a 15.2 Hz back and forth oscillation mode that resonates with the first order tire drive.The main driving source of 60 Hz is the first-order driving frequency of the transmission system,which is mainly induced by the dynamic imbalance of the transmission system.Considering the cost,cycle and other factors comprehensively,two schemes were adopted to solve the problem-strengthen the seat skeleton structure and optimize the dynamic unbalance of the drive shaft.Test results under the condition of 120km/h uniform driving speed indicated that the vibration amplitude of seat guide decreased by 45%.After subjective evaluation,the vibration of the seat disappeared,and the improvement was obvious and acceptable.
作者
王璋
张杨
彭洁
张志强
杨猛
WANG Zhang;ZHANG Yang;PENG Jie;ZHANG Zhiqiang;YANG Meng(BAIC Group Off-Road Vehicle Co., Ltd, Beijing 101300, China;Beijing BAIC Off-road Vehicle Research Institute Co., Ltd, Beijing 101300, China)
出处
《车辆与动力技术》
2020年第4期6-11,共6页
Vehicle & Power Technology
关键词
座椅振动
传动轴
模态分析
CAE分析
共振
seat vibration
transmission shaft
modal analysis
CAE analysis
resonance
