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Over-determination in acoustic two-port data measurement
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0002-8474-8563
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0001-7898-8643
2006 (English)In: ICSV13-Vienna / [ed] J. Eberhardsteiner, H.A. Mang, H. Waubke, 2006Conference paper, Published paper (Other academic)
Abstract [en]

Measurement of plane wave acoustic transmission properties, so called two-port data, of flow duct components is important in many applications. It is an important tool for instance in the development of mufflers for IC-engines. Measurement of two-port data is difficult when the flow velocity in the measurement duct is high because of the flow noise contamination of the measured pressure signals. The plane wave acoustic two-port is a 2x2 matrix containing 4 complex quantities at each frequency. To experimentally determine these unknowns the acoustic state variables on the inlet and outlet side must be measured for two independent test cases. The two independent test cases can be created by: changing the acoustic load on the outlet side leading to the so-called two-load technique or by using one acoustic source on the inlet side and one acoustic source on the outlet side leading to the so-called two-source technique. In the latter case the independent test cases are created by first using the source on the inlet side and then the source on the outlet side. As pointed out by Åbom it is also possible to run both sources simultaneously to create more than two independent test cases. This over-determination could be used to improve the measurement results for instance if the data is contaminated by flow-noise. In this paper over-determination is tested by applying up to 5 different test cases. This procedure has been applied to a single orifice test object.

Place, publisher, year, edition, pages
2006.
Keyword [en]
over-determination, duct acoustics, measurements, two-port, flow noise supression
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-62234Scopus ID: 2-s2.0-84883327812ISBN: 978-162748150-2 (print)OAI: oai:DiVA.org:kth-62234DiVA: diva2:479998
Conference
ICSV13-Vienna, The Thirteenth International Congress on Sound and Vibration, Vienna, Austria, July 2-6, 2006
Note

QC 20120531

Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2014-11-05Bibliographically approved

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Bodén, HansÅbom, Mats

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