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Can acoustic multi-port models be used 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.
2010 (English)In: 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference), 2010, 2010-4009- p.Conference paper, Published paper (Refereed)
Abstract [en]

In duct aeroacoustic problems can be described using so called acoustic multi-port models. Such models represent a linear and time-invariant aeroacoustic 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 kind 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. The implication of these ideas is that multi-port models can be used to analyze amplification of sound and whistling.

Place, publisher, year, edition, pages
2010. 2010-4009- p.
Keyword [en]
Acoustic interaction, Active parts, Aeroacoustic model, Aeroacoustic problems, Feed-back loop, Frequency domain model, Frequency domains, matrix, Multi-port, Reflection and transmission, Scattering matrices, Sound waves, Source strength, Time invariants
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-149688Scopus ID: 2-s2.0-78649544344ISBN: 978-160086744-6 (print)OAI: oai:DiVA.org:kth-149688DiVA: diva2:741761
Conference
16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference), 7 June 2010 through 9 June 2010, Stockholm, Sweden
Note

QC 20140829

Available from: 2014-08-29 Created: 2014-08-26 Last updated: 2014-08-29Bibliographically approved

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Åbom, Mats

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