Abstract
Impact noise generated in electric vehicles in the 200 Hz ~ 500 Hz is perceived as rumble noise of an internal combustion engine. It is one of the biggest noise problems during electric vehicle development. This noise is caused by a shock phenomenon generated in each revolution due to interference between the minor diameter of the motor shaft spline and the reducer input shaft spline due to misalignment. Through spline measurement comparisons and spline LDP analysis results, the minor diameter of the motor shaft and its misalignment have proved to be important factors. To eliminate spline impact noise and maintain the spline
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