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Investigation on the acoustic behaviour of a locally resonant metamaterial curved panel
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-7547-6535
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-6555-531X
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-9632-8398
2018 (English)In: : Hiroshima Calling, ICSV 2018, Hiroshima, 2018, Vol. 6, p. 3409-3416Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

In order to seek for new ways to improve the sound transmission loss at ring frequency range for curved aeronautical structures, a semi-infinite curved panel, representing aircraft fuselage, is studied in this research. First, a minor modification on Koval's classical theory for cylindrical shells is made to incorporate effective mass theory for acoustic metamaterials. Then, based on the finite element simulations, the possibility of improving the acoustic behaviour of such panels by using locally resonant acoustic metamaterial treatment is investigated. Both the host curved panel, and the host panel periodically mounted with local resonators, denoted as metamaterial curved panel, are compared from the transmission loss point of view. The observations show that the antiresonance dip appears first rather than the resonance peak in the sound transmission loss for the tested metamaterial curved panel, which may be explained by the effective impedance of the panel. The influences of the panel curvature on the dynamic behaviour of the local resonators are further discussed in comparison to the same resonantsystem acting on the flat panel. Both the finite element simulations and the theoretical estimations show the same trend, thus confirms the proposed explanation.

Place, publisher, year, edition, pages
Hiroshima, 2018. Vol. 6, p. 3409-3416
National Category
Vehicle Engineering Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-244438Scopus ID: 2-s2.0-85058798180OAI: oai:DiVA.org:kth-244438DiVA, id: diva2:1290582
Conference
25th International Congress on Sound and Vibration 2018
Note

QC 20190226

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-02-26Bibliographically approved

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Liu, ZiboRumpler, RomainFeng, Leping

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