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Driveline Optimization to Reduce the Noise in 4X4 Heavy Commercial Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 15, 2020 by SAE International in United States
One of the important factors strongly required by customers now a days is lower noise and vibration in vehicle. This is the prime motive behind the increase in trend to refine the noise and vibration performance of major sources like engine on transmission in automobiles. In this paper the prime focus is made on the study of effect of driveline angles on the noise and vibration behavior in a 4X4 configuration commercial vehicle. The impact of propeller shaft angles in the transfer of driveline excitations to the transmission and the resulting noise and vibration is studied. An abnormal noise was perceived from transmission and the root cause was investigated for the same. The driveline excitations from the propeller shaft are intensified as noise and vibration in transmission. These excitations were high due to the higher driveline angles as this was design requirement to maintain higher ground clearance. A two-stage approach was adopted to modify the effect (transmission) and cause (propeller shaft angle) there by reducing the abnormal noise and vibration perceived in the vehicle. First the transmission gears were replaced from spur gear to helical gear , this reduced the intensity of noise and vibration. Secondly the driveline angles were reduced to optimum and further modifying the axles suitably helped to achieve the design requirement of ground clearance at the same time eliminated the driveline noise and vibration in vehicle. The same was perceived both objective and subjective assessments.