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On the use of linear aero-acoustic methods to predict whistling
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7898-8643
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2009 (English)In: 16th International Congress on Sound and Vibration 2009, ICSV 2009, 2009, 2406-2413 p.Conference paper, Published paper (Refereed)
Abstract [en]

In duct aero-acoustic problems can be described using so called acoustic multi-port models. Such models represent a linear and time-invariant aero-acoustic model, which split the problem in a passive part, a scattering matrix in the frequency domain, describing the reflection and transmission and an active part describing the source strength. In accordance with Lighthill one normally assumes in this type of model that the source part is uncoupled from the acoustic field. However, this assumption can be relaxed and it is fully possible to assume that the source strength can be affected by incident sound waves via a linear and time-invariant mechanism. The most general frequency domain model for this is a matrix which formally can be added to the scattering matrix describing the passive part. This leads to a model that has the same structure as the traditional multi-port model, but where the scattering matrix also contains information about fluid-acoustic interaction effects which is the origin for creating fluid driven feedback loops or whistles.

Place, publisher, year, edition, pages
2009. 2406-2413 p.
Keyword [en]
Active parts, Feed-back loop, Frequency domain model, Frequency domains, Interaction effect, Multi-port, Reflection and transmission, Scattering matrices, Source strength, Time invariants, Acoustic fields, Scattering parameters, Signaling, Aeroacoustics
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-152026Scopus ID: 2-s2.0-84871447959ISBN: 978-161567736-8 (print)OAI: oai:DiVA.org:kth-152026DiVA: diva2:749052
Conference
16th International Congress on Sound and Vibration 2009, ICSV 2009, 5 July 2009 through 9 July 2009, Krakow, Poland
Note

QC 20140923

Available from: 2014-09-23 Created: 2014-09-23 Last updated: 2014-09-23Bibliographically approved

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Åbom, Mats

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