Change search
ReferencesLink to record
Permanent link

Direct link
Polyharmonic distortion modelling applied to acoustic characterisation of peforates
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-8474-8563
2011 (English)In: 17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference), 2011Conference paper (Refereed)
Abstract [en]

This paper discusses the possibility to apply polyharmonic distortion modelling, used for nonlinear characterisation of microwave systems, to acoustic characterisation of samples with non-linear properties such as perforates and other facing sheets used in aircraft engine liners and automotive mufflers. In some previous papers multi-port techniques using sinusoidal excitation for characterization of samples with non-linear properties were developed and experimentally tested. These techniques aimed at taking non-linear energy transfer between sound field harmonics into account. Essentially linear system identification theory was however used assuming that superposition applies and that the functions studied are analytical. Polyharmonic distortion modelling does not assume that the function relating waves incident and reflected or transmitted is analytic nor does it assume application of normal superposition. This technique is tested on experimental data obtained from measurements on a perforate mounted in a duct. The similarity to the previously developed nonlinear scattering matrix techniques is demonstrated. It is shown how the results obtained can be used to analyse nonlinear energy transfer to higher harmonics. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Place, publisher, year, edition, pages
, 17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference)
Keyword [en]
Distortion modelling, Higher harmonics, Microwave systems, Multi-port, Nonlinear energy transfer, Nonlinear properties, Nonlinear scattering, Sinusoidal excitations, Acoustic fields, Aircraft engines, Energy transfer, Linear systems, Microwave acoustics, Scattering parameters, Aeroacoustics
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-148673ScopusID: 2-s2.0-84883061631ISBN: 9781600869433OAI: diva2:750133
17th AIAA/CEAS Aeroacoustics Conference 2011 (32nd AIAA Aeroacoustics Conference), 5 June 2011 through 8 June 2011, Portland, OR

QC 20140926

Available from: 2014-09-26 Created: 2014-08-11 Last updated: 2014-11-17Bibliographically approved

Open Access in DiVA

fulltext(867 kB)39 downloads
File information
File name FULLTEXT01.pdfFile size 867 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

ScopusPublished version

Search in DiVA

By author/editor
Bodén, Hans
By organisation
Aeronautical and Vehicle EngineeringLinné Flow Center, FLOW
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
Total: 39 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 41 hits
ReferencesLink to record
Permanent link

Direct link