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Analysis and Elimination of Howling Noise in Compact Utility Vehicle
Technical Paper
2017-28-1922
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
NVH is becoming one of the major factor for customer selection of vehicle along with parameters like fuel economy and drivability. One of the major NVH challenges is to have a vehicle with aggressive drivability and at the same time with acceptable noise and vibration levels.
This paper focuses on the compact utility vehicle where the howling noise is occurring at higher rpm of the engine. The vehicle is powered by three cylinder turbocharged diesel engine. The noise levels were higher above 2500 rpm due to the presence of structural resonance. Operational deflection shapes (ODS) and Transfer path analysis (TPA) analysis was done on entire vehicle and powertrain to find out the major reason for howling noise at higher engine rpm. It is observed that the major contribution for noise at higher rpm is due to modal coupling between powertrain, half shaft and vehicle sub frame. The acoustic transfer function levels from the body and the sub-frame connection point to driver ear were also higher at the problematic frequency where structural resonance were observed in operational measurements. Structural modification on powertrain, half shaft and installation of tuned mass damper on sub frame reduced the howling noise to great extent. The effect of powertrain torsional vibration and its contribution to this higher noise levels were also discussed.
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Citation
Moorthy, S., Rao, M., Raghavendran, P., and Babu, S., "Analysis and Elimination of Howling Noise in Compact Utility Vehicle," SAE Technical Paper 2017-28-1922, 2017, https://doi.org/10.4271/2017-28-1922.Also In
References
- Gillespie , T. Fundamentals of Vehicle Dynamics Warrendale Society of Automotive Engineers, Inc. 1992 978-1-56091-199-9
- Schwibinger , P. , Hendrick , D. , Wu , W. , and Imanishi , Y. Noise and Vibration Control Measures in the Powertrain of Passenger Cars SAE Technical Paper 911053 1991 10.4271/911053
- Kim , S. , Inoue , A. , and Singh , R. Experimental Study of Structure-Borne Noise Transfer Paths over the Mid-Frequency Regime SAE Technical Paper 2005-01-2338 2005 10.4271/2005-01-2338
- Aubert , A. and Howle , A. Design Issues in the Use of Elastomers in Automotive Tuned Mass Dampers SAE Technical Paper 2007-01-2198 2007 10.4271/2007-01-2198