摘要
针对某款纯电动汽车在低速、大扭矩极限转向工况下差速器出现的240 Hz附近“呜呜”声异响问题,本文开展了系统的机理分析与优化措施研究。研究表明,该异响是由半轴齿轮垫片摩擦副的“黏滑”(Stick-Slip)效应与半轴弯曲模态发生耦合共振而产生的。为解决此问题,本研究从激励源和传递路径两个维度,通过整车试验对比了三种优化方案,试验结果量化表明:半轴配重在共振频带内降噪效果最显著(约20 dB),但对非共振频带改善有限;更换MoS2垫片可从激励源将异响稳定地降低约7.5 dB,效果次之但普适性强;提升油温的方案降低约4 dB,可控性较差。本研究最终确立了针对此类问题的优化策略优先级,为纯电动汽车电驱总成的NVH正向开发与问题解决提供了有效的工程指导。
This paper investigates the mechanism and optimization measures for a differential"humming"noise occurring around 240 Hz in a specific new energy vehicle under low-speed,high-torque,and full-lock steering conditions.The research indicates that this noise originates from the coupling resonance between the"stick-slip"effect of the side gear washer's friction pair and the bending mode of the driveshaft.To address this issue,three optimization solutions targeting both the source and the path were experimentally compared on a test vehicle.The quantitative test results demonstrate that adding mass to the driveshaft yields the most significant noise reduction within the resonance band(approx.20 dB),but has limited effect on non-resonant frequencies.Replacing the washers with MoS2 provides a stable noise reduction of about 7.5 dB at the source,showing strong general applicability.The solution for increasing the oil temperature reduces the sound level by approximately 4 dB,and its controllability is poor.This study establishes a clear priority of optimization strategies for this type of NVH issue,offering effective engineering guidance for the forward development and problem-solving of NEV electric drive systems.
作者
廖根旺
应源婷
Liao Genwang;Ying Yuanting(GAC AION Co.,Ltd.,Guangzhou 511400;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640)
关键词
NVH
差速异响
摩擦系数
黏滑效应
纯电动汽车
NVH
differential noise
friction coefficient
stick-slip effect
new energy vehicle
