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Experimental study of nonlinear acoustic properties of perforates using band-limited random excitation information
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0002-8474-8563
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0003-4103-0129
2018 (Engelska)Ingår i: 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, International Institute of Acoustics and Vibration, IIAV , 2018, Vol. 3, s. 1818-1825Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Perforates are used for noise control in automotive mufflers and aircraft engine liners as well as for other vehicles and machines. Their acoustic properties and noise reduction are known to depend on the mean flow field and other parameters such as temperature and acoustic excitation level. It is therefore of interest to understand how the properties of perforates varies with the level of acoustic excitation. This paper gives an overview of high level nonlinear effects on the acoustic properties of perforates. It includes semi-empirical models as well as experimental studies. Methods for studying nonlinear effects and harmonic interaction effects, for perforates, using single tone excitation and Poly-harmonic distortion models or nonlinear scattering matrices are discussed. These techniques typically require measurements with a number of different acoustic loads. It would be more attractive to directly be able to extract the nonlinear acoustic properties from a more limited set of experiments using either random or periodic excitation. Multi input - single output techniques for nonlinear system identification using broadband random excitation has been tried with limited success. One reason is the mixing of the sound pressure signal incident from the acoustic source with the sound pressure transferred to higher frequencies by nonlinear effects at the perforate sample. The present paper includes an attempt to combine band-limited broadband excitation with Poly-harmonic distortion models or nonlinear scattering matrices describing the nonlinear transfer of energy to higher frequencies.

Ort, förlag, år, upplaga, sidor
International Institute of Acoustics and Vibration, IIAV , 2018. Vol. 3, s. 1818-1825
Nyckelord [en]
Acoustic properties, Aeroacoustics, Nonlinear system identification, Perforates
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-241887Scopus ID: 2-s2.0-85058683457ISBN: 9781510868458 (tryckt)OAI: oai:DiVA.org:kth-241887DiVA, id: diva2:1282537
Konferens
25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018, Hiroshima, Japan, 8 July 2018 through 12 July 2018
Anmärkning

QC 20190125

Tillgänglig från: 2019-01-25 Skapad: 2019-01-25 Senast uppdaterad: 2019-01-25Bibliografiskt granskad

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Bodén, HansKhodashenas, Niloofar SayyadBoij, Susann

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