DC FieldValueLanguage
dc.contributor.authorLangfeldt, Felix-
dc.contributor.authorGleine, Wolfgang-
dc.contributor.authorEstorff, Otto von-
dc.date.accessioned2019-07-19T09:50:36Z-
dc.date.available2019-07-19T09:50:36Z-
dc.date.issued2018-03-17-
dc.identifier.citationJournal of Sound and Vibration (417): 359-375 (2018-03-17)de_DE
dc.identifier.issn0022-460Xde_DE
dc.identifier.urihttp://hdl.handle.net/11420/2999-
dc.description.abstractA new analytical model for the oblique incidence sound transmission loss prediction of baffled panels with multiple subwavelength sized membrane-type acoustic metamaterial (MAM) unit cells is proposed. The model employs a novel approach via the concept of the effective surface mass density and approximates the unit cell vibrations in the form of piston-like displacements. This yields a coupled system of linear equations that can be solved efficiently using well-known solution procedures. A comparison with results from finite element model simulations for both normal and diffuse field incidence shows that the analytical model delivers accurate results as long as the edge length of the MAM unit cells is smaller than half the acoustic wavelength. The computation times for the analytical calculations are 100 times smaller than for the numerical simulations. In addition to that, the effect of flexible MAM unit cell edges compared to the fixed edges assumed in the analytical model is studied numerically. It is shown that the compliance of the edges has only a small impact on the transmission loss of the panel, except at very low frequencies in the stiffness-controlled regime. The proposed analytical model is applied to investigate the effect of variations of the membrane prestress, added mass, and mass eccentricity on the diffuse transmission loss of a MAM panel with 120 unit cells. Unlike most previous investigations of MAMs, these results provide a better understanding of the acoustic performance of MAMs under more realistic conditions. For example, it is shown that by varying these parameters deliberately in a checkerboard pattern, a new anti-resonance with large transmission loss values can be introduced. A random variation of these parameters, on the other hand, is shown to have only little influence on the diffuse transmission loss, as long as the standard deviation is not too large. For very large random variations, it is shown that the peak transmission loss value can be greatly diminished.en
dc.description.sponsorshipframework of the LuFo IV-4 project Comfortable Cabin for Low-Emission Aircraft (COCLEA), funded by the Federal Ministry for Economic Affairs and Energy (grant number: 20K1102D )de_DE
dc.language.isoende_DE
dc.relation.ispartofJournal of sound and vibrationde_DE
dc.titleAn efficient analytical model for baffled, multi-celled membrane-type acoustic metamaterial panelsde_DE
dc.typeArticlede_DE
dc.type.diniarticle-
dcterms.DCMITypeText-
tuhh.abstract.englishA new analytical model for the oblique incidence sound transmission loss prediction of baffled panels with multiple subwavelength sized membrane-type acoustic metamaterial (MAM) unit cells is proposed. The model employs a novel approach via the concept of the effective surface mass density and approximates the unit cell vibrations in the form of piston-like displacements. This yields a coupled system of linear equations that can be solved efficiently using well-known solution procedures. A comparison with results from finite element model simulations for both normal and diffuse field incidence shows that the analytical model delivers accurate results as long as the edge length of the MAM unit cells is smaller than half the acoustic wavelength. The computation times for the analytical calculations are 100 times smaller than for the numerical simulations. In addition to that, the effect of flexible MAM unit cell edges compared to the fixed edges assumed in the analytical model is studied numerically. It is shown that the compliance of the edges has only a small impact on the transmission loss of the panel, except at very low frequencies in the stiffness-controlled regime. The proposed analytical model is applied to investigate the effect of variations of the membrane prestress, added mass, and mass eccentricity on the diffuse transmission loss of a MAM panel with 120 unit cells. Unlike most previous investigations of MAMs, these results provide a better understanding of the acoustic performance of MAMs under more realistic conditions. For example, it is shown that by varying these parameters deliberately in a checkerboard pattern, a new anti-resonance with large transmission loss values can be introduced. A random variation of these parameters, on the other hand, is shown to have only little influence on the diffuse transmission loss, as long as the standard deviation is not too large. For very large random variations, it is shown that the peak transmission loss value can be greatly diminished.de_DE
tuhh.publisher.doi10.1016/j.jsv.2017.12.018-
tuhh.publication.instituteModellierung und Berechnung M-16de_DE
tuhh.type.opus(wissenschaftlicher) Artikel-
tuhh.institute.germanModellierung und Berechnung M-16de
tuhh.institute.englishModellierung und Berechnung M-16de_DE
tuhh.gvk.hasppnfalse-
dc.type.driverarticle-
dc.type.casraiJournal Article-
tuhh.container.volume417de_DE
tuhh.container.startpage359de_DE
tuhh.container.endpage375de_DE
item.languageiso639-1en-
item.fulltextNo Fulltext-
item.openairetypeArticle-
item.grantfulltextnone-
item.creatorOrcidLangfeldt, Felix-
item.creatorOrcidGleine, Wolfgang-
item.creatorOrcidEstorff, Otto von-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.creatorGNDLangfeldt, Felix-
item.creatorGNDGleine, Wolfgang-
item.creatorGNDEstorff, Otto von-
item.cerifentitytypePublications-
crisitem.author.deptModellierung und Berechnung M-16-
crisitem.author.orcid0000-0003-2380-2746-
crisitem.author.parentorgStudiendekanat Maschinenbau-
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