典型路面激励下的蓄电池框架动态响应研究

Research on Dynamic Response of Commercial Vehicle Battery Tray Under Typical Road Surface Excitation

为研究重型商用车蓄电池框架的动态性能,在典型路面激励下的整车路试中采集蓄电池框关键位置振动信号。针对振动信号的非线性和非平稳特性,应用经验模态分解(EMD)和固有模态分析的方法,重新构建蓄电池框振动信号,并对信号进行动态响应分析。结果显示,该蓄电池框架在典型路面激励下易产生低频共振,且由于其悬臂结构出现振动放大现象,严重影响蓄电池框架性能和使用寿命,需要对蓄电池框架结构进行优化。基于EMD的典型路面下动态特性分析对商用车零部件结构优化具有一定的指导作用。

In order to research the dynamic performance of the battery tray used in heavy commercial vehicle,vibration signals at key positions of battery tray are collected during vehicle validationunder typical road surface excitation.As regard tothe nonlinear and non-stationary characteristics of vibration signals,the battery tray vibration signals are reconstructed by EMD and inherent mode analysis methods,and dynamic response of the signals are analyzed.The results show that the battery tray is easy to generate low frequency resonance under typical road surface excitation.At the same time,the cantilever structure magnifies the vibration,which will seriously affect the performance and lifetime of the battery tray.Therefore,the battery tray structure needs to be optimized.The analysis of dynamic characteristics under typical road surface based on EMD has a certain guiding effect on the optimization of commercial vehicle parts structure.