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Identification, Quantification and Reduction of Structural- Borne Road Noise in a Mid-Size Passenger Car
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English
Abstract
This paper presents the measurement & analysis procedures and the results of a complete road noise identification and reduction project on a midsize passenger car.
Operational interior noise signals and structural accelerations are measured for several test conditions. The operating data are decomposed into sets of mathematically independent phenomena by Principal Component Analysis. Operating Deflection Shape Analysis and Transfer Path Analysis are applied to each of these independent phenomena. Critical transfer paths are thus identified and quantified.
The interior sound level is amplified when the frequency content of the transmitted energy coincides with structural resonances or standing waves of the interior car cavity. The vehicle is dynamically characterized by Experimental Structural Modal Analysis and by Acoustic Modal Analysis.
The insights gained into the noise generation and transmission process that result from these analyses, are “materialized” into realistic design modifications. An analysis method to predict the acoustic efficiency of structural modifications using experimental modal models and measured vibro-acoustic transferfunction data is presented.
Eventually, prototype structural modifications are implemented and evaluated by measurements on a test track.
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Citation
Gielen, L., Van der Linden, P., and Deges, R., "Identification, Quantification and Reduction of Structural- Borne Road Noise in a Mid-Size Passenger Car," SAE Technical Paper 960195, 1996, https://doi.org/10.4271/960195.Also In
Advances in Component Designs for Noise and Vibration Control
Number: SP-1147; Published: 1996-02-01
Number: SP-1147; Published: 1996-02-01
References
- OTTE D. SAS P. SNOEYS R. VAN DE PONSEELE P. LEURIDAN J. 1987 “Use of Principal Component Analysis and Virtual Coherences for Dominant Noise Source Identification” Proc. 2nd Int. Seminar on Noise Source Identification and Numerical Methods in Acoustics Leuven (Belgium) Sept 23-24 1987 paper No. G1-5 16
- HENDRICX W. VANDENBROECK D. 1993 “Suspension Analysis in View of Road Noise Optimisation” Proc. 1993 Noise and Vibration Conference Traverse City-MI (USA) May 10-13 1993 647 652 SAE paper No. 931343
- VAN DER LINDEN P.J.G. FYN J.K. “Using Mechanical-Acoustic reciprocity for diagnosis of structure-borne sound in vehicles SAE 931340
- DE VIS D. HENDRICX W. VAN DER LINDEN PJG. 1992 “Development and Integration of an advanced unified approach to structure-borne noise analysis” Proc. 1992 2nd International Conference Vehicle Comfort
- WYCKAERT K. AUGUSTINOVICZ F. “Vibro-acoustic Modal Analysis: Reciprocity Model Symmetry and Modal Validity” 1995 International Seminar on Modal Analysis Leuven (Belgium)