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Low sound level source path contribution on a HVAC
Technical Paper
2008-36-0505
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For compliance test purposes, the noise level of a HVAC is usually measured with a pressure microphone positioned at a certain distance. This measurement is normally performed in an anechoic room.
However, this method doesn't provide the engineer any insight on what noise sources do contribute to the overall noise level measured. A new Microflown based low sound level source path contribution analysis measurement approach is presented to pinpoint the various noise sources that vary in time, frequency and place. The new method shows all place and time dependent noise sources, and allows assessment of the extent that they contribute to the overall noise level determined for the compliance test using the sound pressure microphone. Furthermore, the new method can be used in a normal room, eliminating the need to use an anechoic room.
Authors
Citation
de Bree, H. and Basten, T., "Low sound level source path contribution on a HVAC," SAE Technical Paper 2008-36-0505, 2008, https://doi.org/10.4271/2008-36-0505.Also In
References
- Wolff O., Sottek R., Binaural Panel Noise Contribution Analysis, Alternative to the Conventional Window Method, DAGA 2004
- Wolff Oliver, Panel Contribution Analysis - An Alternative Window Method, SAE Traverse City, 2005
- de Bree H-E, Svetovoy V.B., Raangs R., Visser R., The very near field; theory, simulations and measurements of sound pressure and particle velocity in the very near field, ICSV11, St. Petersburg 2004
- Fahy F.J., Some applications of the reciprocity principle in experimental vibroacoustics; acoustical physics, vol. 48, nr 2, 2003, pp 217-229).
- Verheij J.W., Experimental procedures for quantifying sound paths to the interior of road vehicles, 2nd international conference on vehicle comfort, part 1, Bologna, 1992, pp. 483-491.
- Verheij J.W., Inverse and Reciprocity Methods for Machinary Noise Source Characterization and Sound Path Quantification. Part 1: Sources, Int. J. Acoust. Vibr. Vol. 2, pp. 11-20 (1997).
- Verheij J.W., Inverse and Reciprocity Methods for Machinary Noise Source Characterization and Sound Path Quantification. Part 2: transmission paths, Int. J. Acoust. Vibr. Vol. 3, pp. 103-112 (1997).
- DUVAL A. et al., Faurecia vehicle acoustic synthesis method: A hybrid approach to simulate interior noise of fully trimmed vehicles. In Confort automobile et ferroviaire - Le Mans, 2004.
- Duval Arnaud et al., Vehicle Acoustic Synthesis Method 2nd Generation: an effective hybrid simulation tool to implement acoustic lightweight strategies, Journée SFA / Renault / SNCF, November the 30th 2005.
- Rondeau Jean-Francois et al., Vehicle Acoustic Synthesis Method: improving acquisition time by using pu probes, SAE traverse city, 2005
- Sottek Roland et al, An artificial head which speaks from its ears: investigations on reciprocal path analysis in vehicles, using a binaural sound source, SAE 2003.
- Jacobsen F. et al, a comparison of pp and pu sound intensity measurement systems, JASA 2005.
- Williams Earl G., Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography, ISBN: 0127539603, June 1999.
- Verheij J.W.. On the characterization of the acoustical source strength of structural components, piano-tutorial, 1996.
- Otsuru Toru et al, Impedance measurement of materials by use of ambient noise for computational acoustics, Internoise 2006
- Duval Arnaud et al.,Vehicle Acoustic Synthesis Method 2nd Generation: new developments with p-u probes allowing to simulate unsteady operative conditions like run-ups, SAE 2007
- Pierce A.D., “Acoustics, An Introduction to Its Physical Principles and Applications”, equation (4-9.7), Acoustical Society of America, 1989.
- Hald et al, Panel Contribution Analysis using a Volume Velocity Source and a Double Layer Array with the SONAH Algorithm, Internoise 2006.
- de Bree H.E., et al. Fast in-flight cabin interior sound source localization, ERF33, Kazan, Russia, 2007.
- de Bree H-E., Druyvesteyn W.F., A particle velocity sensor to measure the sound from a structure in the presence of background noise, Forum Acusticum, 2005.