Investigation on Cyclic Noise in Vehicle Creeping during Traffic Conditions 2019-01-1557

Now-a-days, customers are getting delighted after receiving best in class vehicle - NVH performance in competitive price. In order to enhance customer NVH comfort, a specific noise phenomenon during product development was investigated. While testing trials in traffic conditions, cyclic noise was observed in vehicle creeping. This noise was similar to the gear rattle noise. It was perceived unpleasant due to low diesel engine noise and wide frequency range spectrum of cyclic noise. This paper explains the root cause of this cyclic noise through various drivetrain experimental trials and also states possible countermeasures through modification in gear and clutch design parameters.