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Investigation of Nonlinear Acoustic properties for Perforates
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.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2006 (English)In: ICSV13-Vienna / [ed] J. Eberhardsteiner, H.A. Mang, H. Waubke, 2006Conference paper, Published paper (Other academic)
Abstract [en]

This paper presents the results of a study of non-linear acoustic properties of perforates and micro-perforates. The results are potentially of interest for perforates and other facing sheets used in aircraft engine liners as well as perforate pipes used in automotive mufflers. In the linear limit the perforate acoustic impedance is independent of the sound field but when the sound pressure level is high it will be dependent on the acoustic particle velocity in the holes. For pure tone excitation the impedance will be controlled by the acoustic particle velocity at that frequency. If the acoustic excitation is random or periodic with multiple harmonics the impedance at a certain frequency will depend on the particle velocity at other frequencies. In this paper a study has been made of harmonic interaction effects by using multiple pure tone excitation and random noise excitation.

Place, publisher, year, edition, pages
2006.
Keyword [en]
Perforates, acoustic properties, nonlinear, experimental techniques
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-62236Scopus ID: 2-s2.0-84883338252ISBN: 978-162748150-2 (print)OAI: oai:DiVA.org:kth-62236DiVA: diva2:480015
Conference
ICSV13-Vienna, The Thirteenth International Congress on Sound and Vibration, Vienna , Austria, July 2-6, 2006
Note

QC 20141103

Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2014-11-17Bibliographically approved

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Bodén, Hans

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