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Study of nonlinear energy transfer for perforated wall treatment using acoustic source characterisation techniques
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0002-8474-8563
2011 (English)In: 18th International Conference on Sound and Vibration (ICSV18), 2011Conference paper (Other academic)
Abstract [en]

This paper discusses experimental techniques for obtaining the acoustic properties of in-duct samples with non-linear acoustic characteristics such as perforates used in aircraft engine liners and automotive mufflers. The methods developed are intended for studies of non-linear energy transfer to higher harmonics for samples only accessible from one side such as wall treatment in aircraft engine ducts or automotive exhaust systems. Nonlinear energy transfer results in sound generation at higher harmonics at the sample (perforate) surface. The idea here is that these sources can be characterised using linear one-port techniques which are traditionally used for obtaining source data for in-duct sources such as fans or IC-engines. The results of the experimental tests show that these new techniques can give results which are useful for understanding non-linear energy transfer to higher harmonics.

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, Aeroacoustics
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-61845ScopusID: 2-s2.0-84871498201OAI: diva2:479773
18th International Conference on Sound and Vibration, 10-14 July 2011, Rio de Janeiro, Brazil
QC 20120410Available from: 2012-01-18 Created: 2012-01-18 Last updated: 2012-04-10Bibliographically approved

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