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Determination of the acoustic properties of liners under high level multi-tone excitation
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-8474-8563
2016 (English)In: 22nd AIAA/CEAS Aeroacoustics Conference, 2016, 2016Conference paper (Refereed)
Abstract [en]

This paper discusses the effect of high level multi-tone acoustic excitation on the acoustic properties of acoustic liners and perforates. It is based on an experimental study of the nonlinear properties of these types of samples without mean grazing or bias flow. Compared to previous studies results from normal incidence impedance tube measurements are compared to liners placed in a grazing incidence configuration. It is known from previous studies that high level acoustic excitation at one frequency will change the acoustic impedance of perforates at other frequencies, thereby changing the boundary condition seen by the acoustic waves. This effect could be used to change the impedance boundary conditions and for instance increase the absorption. It could also pose a problem for the correct modelling of sound transmission through ducts lined with such impedance surfaces. The effect of the combination of frequency components is also studied. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

Place, publisher, year, edition, pages
Keyword [en]
Acoustic properties, Acoustic wave transmission, Acoustics, Aeroacoustics, Architectural acoustics, Boundary conditions, Acoustic excitation, Frequency components, Grazing incidence, Impedance boundary conditions, Impedance surface, Nonlinear properties, Normal incidence, Sound transmission, Acoustic impedance
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-194603ScopusID: 2-s2.0-84982958547ISBN: 9781624103865OAI: diva2:1043914
22nd AIAA/CEAS Aeroacoustics Conference, 2016, 30 May 2016 through 1 June 2016

Correspondence Address: Bodén, H.; Linné Flow Centre MWL, Aeronautical and Vehicle Engineering, KTHSweden. QC 20161101

Available from: 2016-11-01 Created: 2016-10-31 Last updated: 2016-11-02Bibliographically approved

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