基于阶次和传递路径分析的电驱动总成对车内噪声影响

Analysis of Influence of Electric Drive Assembly on Vehicle Interior Noise Based on Order and Transfer Path Analysis

为了探究电驱动总成对车内噪声的影响,对某纯电动汽车进行急加速工况下的试验研究。基于阶次分析确定车内噪声与电驱动总成振动噪声之间的关联,并识别电驱动总成对车内噪声影响较大的激励;基于奇异值分解改进的工况传递路径分析(Operational Transfer Path Analysis,OTPA)方法,分析对车内噪声影响最大的激励通过结构路径和空气路径对车内噪声的贡献情况。结果表明由空间0阶径向电磁力引起的频率24阶激励和48阶激励对车内噪声影响较大,其中24阶激励影响最大。在低转速区间,24阶振动激励和24阶声学激励通过结构路径对车内噪声贡献和通过空气路径基本一致;在中高转速区间,24阶声学激励通过空气路径对车内噪声贡献较大;在高转速区间,24阶振动激励通过后悬置Z方向结构路径对车内噪声贡献较大。研究结果从激励源和传递路径两个方面为降低纯电动汽车车内噪声指明方向。

In order to explore the influence of the electric drive assembly on the vehicle interior noise, an experimental study was carried out on a pure electric vehicle under rapid acceleration condition based on the order analysis, the correlation between the vehicle interior noise and the vibration noise of the electric drive assembly is determined, and the excitation of the electric drive assembly which has a greater impact on the vehicle interior noise was identified. Using the improved operational transfer path analysis(OTPA) method based on singular value decomposition, the contribution of the excitation,which has the greatest influence on the vehicle interior noise through the structural path and the air path to the vehicle inside,was analyzed. The results show that the frequencies of 24th order excitation and 48th order excitation induced by the spatial0-th order radial electromagnetic force have greater influences on the vehicle interior noise, and among them, the 24th order excitation has the greatest influence. In the low speed range, the 24th order vibration excitation and the 24th order acoustic excitation contribute basically the same to the vehicle interior noise through the structure path and the air path. In the middlehigh speed range, the 24th order acoustic excitation contributes greatly to the vehicle interior noise through the air path. In the high speed range, the 24th order vibration excitation contributes greatly to the vehicle interior noise through the rear mount Z-direction structure path. The research results point out the direction for reducing the vehicle interior noise of pure electric vehicle from the aspects of excitation source and transfer path.