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Experimental uncertainty analysis of impedance measurements
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-8099-6554
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-8474-8563
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-4103-0129
2016 (English)In: ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, International Institute of Acoustics and Vibrations , 2016Conference paper, Published paper (Refereed)
Abstract [en]

The study of the interaction between acoustics and flow has a long history, and has attracted many scholars. Consequently the major contributors to acoustic-flow interaction are known and improvements made on models to describe the various interactions, give a relative small impact to the overall effect. To validate these new models, experiments have to be more precise and accurate, otherwise no valid statement can be made if the measurements are agreeing with the improved models. The flow-acoustic interaction is commonly measured using impedance tubes through which a flow flows. In this paper, a linear uncertainty analysis is presented to determine the precision of the obtained impedance results. Such kind of analysis has been already reported in literature, but in this paper, the analysis has been expanded to include more uncertain variables and the method is investigated to show the limitations of such an analysis. As an application of the analysis, the measurement of a known impedance without flow has been analyzed, revealing the presence of bias errors in the measurement setup.

Place, publisher, year, edition, pages
International Institute of Acoustics and Vibrations , 2016.
Keyword [en]
Acoustic impedance, Bias error, Experimental uncertainty, Flow-acoustic interaction, Impedance measurement, Impedance tubes, Measurement setup, Uncertain variables, Uncertainty analysis
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-195442Scopus ID: 2-s2.0-84987858819ISBN: 9789609922623 (print)OAI: oai:DiVA.org:kth-195442DiVA: diva2:1050267
Conference
23rd International Congress on Sound and Vibration, ICSV 2016, 10 July 2016 through 14 July 2016
Note

Funding Details: FP7-PEOPLE-ITN-2012, EC, European Commission

QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2016-11-28Bibliographically approved

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