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Experimental investigation of nonlinear acoustic properties for perforates
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.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: Collection of Technical Papers: 12th AIAA/CEAS Aeroacoustics Conference, Cambridge, MA, 2006, Vol. 1, 67-74 p.Conference paper, Published paper (Refereed)
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 lias been made of harmonic interaction effects by using multiple pure tone excitation and random noise excitation.

Place, publisher, year, edition, pages
Cambridge, MA, 2006. Vol. 1, 67-74 p.
Series
12th AIAA/CEAS Aeroacoustics Conference
Keyword [en]
Acoustic excitation, Acoustic particle velocity, Facing sheets, Random noise excitation, Acoustic impedance, Acoustic properties, Aircraft engines, Automobile mufflers, Perforators
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-61820Scopus ID: 2-s2.0-33845784238ISBN: 1563478099 (print)ISBN: 9781563478093 (print)OAI: oai:DiVA.org:kth-61820DiVA: diva2:479703
Conference
12th AIAA/CEAS Aeroacoustics Conference
Note
QC 20120308Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2012-03-08Bibliographically approved

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Scopushttp://www.scopus.com/inward/record.url?eid=2-s2.0-33845784238&partnerID=40&md5=206d70de9c1bfb025991323805c1d2d8

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Bodén, Hans

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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More styles
Language
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Output format
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