某纯电动汽车驱动轴异响分析与优化

针对某纯电动前驱汽车在急加速时驱动轴出现的异响问题，测试了异响产生时的振动和噪声数据，并利用希尔伯特变换识别了异响源的优先级，锁定异响至驱动轴。然后，结合驱动轴的三销轴式万向节、球笼式万向节的工作特性和轮心振动的分析结果，识别异响来源于球笼式万向节内部高速运动时的挤压摩擦。最后，通过改善润滑油脂的成分比例，提升润滑油脂的润滑性能，保证万向节内部润滑油膜具有一定厚度，结合实车验证了该方案的有效性，可为后续排查此类问题提供参考。

Analysis and optimization of abnormal noise Produced by drive shaft of a pure electric vehicle

Aiming at the abnormal noise produced by drive shaft of a pure electric vehicle during rapid acceleration, and vibration and noise data of abnormal noise are tested, then the priority ranking of abnormal noise source is identified by Hilbert transform, which is locked to the transmission shaft. Combined with the working characteristics of drive shaft tripod universal joint, ball cage type universal joint and the analysis results of wheel center vibration, it is identified that the abnormal noise comes from the extrusion friction when the ball cage type universal joint moves at high speed. At last, by improving the composition proportion of the grease, the lubrication performance is improved, and the internal lubricating film of the universal joint is ensured to have a certain thickness. The effectiveness of the scheme is verified by the actual vehicle, which can provide reference for the subsequent investigation.