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Experimental source characterization techniques for studying the acoustic properties of perforates under high level acoustic excitation
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Strukturakustik.ORCID-id: 0000-0002-8474-8563
2011 (Engelska)Ingår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 130, nr 5, s. 2639-2647Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper discusses experimental techniques for obtaining the acoustic properties of in-duct samples with non-linear acoustic characteristic. The methods developed are intended both 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 and for samples accessible from both sides such as perforates or other top sheets. When harmonic sound waves are incident on the sample nonlinear energy transfer results in sound generation at higher harmonics at the sample (perforate) surface. The idea is that these sources can be characterized using linear system identification techniques similar to one-port or two-port techniques which are traditionally used for obtaining source data for in-duct sources such as IC-engines or fans. The starting point will be so called polyharmonic distortion modeling which is used for characterization of nonlinear properties of microwave systems. It will be shown how acoustic source data models can be expressed using this theory. Source models of different complexity are developed and experimentally tested. The results of the experimental tests show that these techniques can give results which are useful for understanding non-linear energy transfer to higher harmonics.

Ort, förlag, år, upplaga, sidor
2011. Vol. 130, nr 5, s. 2639-2647
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-55262DOI: 10.1121/1.3641398ISI: 000297486500020Scopus ID: 2-s2.0-81355164084OAI: oai:DiVA.org:kth-55262DiVA, id: diva2:471406
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QC 20120102Tillgänglig från: 2012-01-02 Skapad: 2012-01-02 Senast uppdaterad: 2017-12-08Bibliografiskt granskad

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Bodén, Hans

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