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Multi-port techniques for acoustic characterisation of non-linear in-duct discontinuities
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-8474-8563
2009 (English)In: 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), 2009Conference paper (Refereed)
Abstract [en]

This paper discusses techniques for obtaining the acoustic properties of in-duct samples with non-linear acoustic characteristics such as perforates and other facing sheets used in aircraft engine liners and automotive mufflers. It is assumed that the non-linearity occurs locally at constrictions or sharp corners. Multi-port techniques using sinusoidal excitation for better characterization of samples with non-linear properties are developed and experimentally tested. These new techniques take non-linear energy transfer between sound field harmonics into account.

Place, publisher, year, edition, pages
Keyword [en]
Characterisation, Multi-port, Non-linear, Non-linear acoustics, Non-Linearity, Nonlinear properties, Sharp corners, Sinusoidal excitations, Sound fields, Acoustic fields, Acoustic properties, Aircraft engines, Automobile mufflers, Energy transfer, Paper sheeting, Aeroacoustics
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-61817ScopusID: 2-s2.0-78149463220ISBN: 9781563479748OAI: diva2:479705
15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). Miami, FL. 11 May 2009 - 13 May 2009
QC 20120220Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2012-02-20Bibliographically approved

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