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Dissemination of the unit watt in airborne sound: Aerodynamic reference sound sources as transfer standards
RISE, SP – Sveriges Tekniska Forskningsinstitut.
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2016 (English)In: Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, 2016, p. 6762-6770Conference paper, Published paper (Refereed)
Abstract [en]

In the process aiming at the establishment of both traceability and transparent uncertainty budgets for airborne sound power, the dissemination of the unit watt ensures the correct relation between the sound power of a stationary primary standard and the sound power of transportable transfer standards. The paper reports on a detailed study to qualify aerodynamic reference sound sources (RSSs) as transfer standards. The temporal stability of RSSs has been determined for both narrow and broad frequency bands. Specially designed scanning apparatuses have provided directivity results. Remaining room reflections and near field effects have also been studied. The dissemination also requires the prediction of sound power under meteorological (static pressure, ambient temperature) and operating (rotational speed) conditions different from calibration conditions. These influences have been investigated and a correction is proposed. Finally, interlaboratory measurement results of the sound power of an aerodynamic reference sound source are reported. © 2016, German Acoustical Society (DEGA). All rights reserved.

Place, publisher, year, edition, pages
2016. p. 6762-6770
Keywords [en]
Correction, Directivity, Dissemination, Sound power, Substitution, Acoustic generators, Acoustic noise measurement, Acoustic variables control, Aerodynamics, Budget control, Electric power factor correction, Frequency bands, Standards, Substitution reactions, Near field effect, Primary standards, Scanning apparatus, Temporal stability, Uncertainty budget, Acoustic noise
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27620Scopus ID: 2-s2.0-84994666657OAI: oai:DiVA.org:ri-27620DiVA, id: diva2:1059665
Conference
45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016, 21 August 2016 through 24 August 2016
Note

References: (2010) ISO 3741 Acoustics - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Precision Methods for Reverberation Test Rooms; (2010) ISO 3743-1 Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Engineering Methods for Small, Movable Sources in Reverberant Fields - Part 1: Comparison Methods for a Hard-walled Test Room; (2010) ISO 3744 Acoustics - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Engineering Methods for An Essentially Free Field over a Reflecting Plane; (2012) ISO 3745 Acoustics - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Precision Methods for Anechoic Rooms and Hemi-anechoic Rooms; (2010) ISO 3746 Acoustics - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Survey Method Using An Enveloping Measurement Surface over a Reflecting Plane; (2010) ISO 3747 Acoustics - Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Engineering/survey Methods for Use in Situ in a Reverberant Environment; (1993) ISO 9614-1 Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Intensity - Part 1: Measurement at Discrete Points; (1996) SO 9614-2 Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Intensity - Part 2: Measurement by Scanning; (2002) ISO 9614-3 Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Intensity - Part 3: Precision Method for Measurement by Scanning; Voelkel, K., Bethke, C., Brezas, S., Wittstock, V., First results in the realisation of the unit watt in airborne sound (2014) Proc INTER-NOISE 2014, , 16-19 November 2014; Melbourne, Australia Proceedings CD; Brezas, S., Wittstock, V., Detailed study towards the dissemination of unit watt in airborne sound (2014) Proc FORUM ACUSTICUM 2014, , 7-12 September 2014; Krakow, Poland Proceedings CD; Brezas, S., Wittstock, V., Study on the dissemination of unit watt in airborne sound (2015) Proc INTER-NOISE 2015, , 9-12 August 2015; San Francisco, USA Proceedings CD; Vorlaender, M., Raabe, G., Calibration of reference sound sources (1995) Acustica, 81, pp. 247-263; (1999) ISO 6926 Acoustics - Requirements for the Performance and Calibration of Reference Sound Sources Used for the Determination of Sound Power Levels; Bies, D.A., Hansen, C.H., (2003) Engineering Noise Control, , 3rd ed. London, UK: Spon Press; Brezas, S., Bethke, C., Wittstock, V., A new scanning apparatus for the dissemination of the unit watt in airborne sound (2016) Proc DAGA 2016, , 14-17 March 2016; Aachen, Germany Proceedings CD; Ver, I.L., Beranek, L.L., (2006) Noise and Vibration Control Engineering, , 2nd ed. New Jersey, USA: John Wiley & Sons; Cellard, P., Andersson, H., Brezas, S., Wittstock, V., Automatic sound field sampling mechanisms to disseminate the unit watt in airborne sound (2016) Proc INTER-NOISE 2016, , 21-24 August 2016; Hamburg, Germany Proceedings CD; Huebner, G., Analysis of errors in measuring machine noise under free-field conditions (1973) J Acoust Soc Am, 54 (4), pp. 967-977; Huebner, G., Wittstock, V., Investigations of the sound power of aerodynamic reference sound sources as a function of static pressure (2001) Proc INTER-NOISE 2001, , 27-30 August 2001; The Hague, The Netherlands Proceedings CD

Available from: 2016-12-22 Created: 2016-12-21 Last updated: 2016-12-22Bibliographically approved

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