Computational homogenisation of acoustic metafoams

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Uittreksel

Acoustic metafoams are novel materials recently proposed for low frequency sound attenuation. The design of their microstructure is based on the combination of standard acoustic foams with locally resonant acoustic metamaterials. This results in improved sound attenuation properties due to the interaction between viscothermal dissipation effects and the local resonance effects at the pore level. In this paper, the non-standard behaviour of such a metafoam with a complex two-phase microstructure is analysed through a multiscale approach. The macroscopic problem is described by general balance equations and at the microscopic scale a detailed representation of the microstructure is considered. The frequency dependent effective properties are used to explain the extraordinary acoustic performance. The homogenisation approach is also validated using direct numerical simulations, showing that the homogenisation technique is adequate in modelling both viscothermal dissipation and the local resonance effect within the metafoam microstructure.

TaalEngels
Artikelnummer103805
Aantal pagina's9
TijdschriftEuropean Journal of Mechanics. A, Solids
Volume77
DOI's
StatusGepubliceerd - 1 sep 2019

Vingerafdruk

homogenizing
Acoustics
Microstructure
acoustics
microstructure
Acoustic waves
Metamaterials
Direct numerical simulation
dissipation
attenuation
Foams
direct numerical simulation
foams
low frequencies
porosity
interactions

Trefwoorden

    Citeer dit

    @article{588d921fb1924715b805d440c6ef430b,
    title = "Computational homogenisation of acoustic metafoams",
    abstract = "Acoustic metafoams are novel materials recently proposed for low frequency sound attenuation. The design of their microstructure is based on the combination of standard acoustic foams with locally resonant acoustic metamaterials. This results in improved sound attenuation properties due to the interaction between viscothermal dissipation effects and the local resonance effects at the pore level. In this paper, the non-standard behaviour of such a metafoam with a complex two-phase microstructure is analysed through a multiscale approach. The macroscopic problem is described by general balance equations and at the microscopic scale a detailed representation of the microstructure is considered. The frequency dependent effective properties are used to explain the extraordinary acoustic performance. The homogenisation approach is also validated using direct numerical simulations, showing that the homogenisation technique is adequate in modelling both viscothermal dissipation and the local resonance effect within the metafoam microstructure.",
    keywords = "Acoustic foams, Acoustic metamaterials, Computational homogenisation, Local resonance, Metafoams, Poro-elastic materials, Viscothermal dissipation",
    author = "M.A. Lewińska and V.G. Kouznetsova and {van Dommelen}, J.A.W. and M.G.D. Geers",
    year = "2019",
    month = "9",
    day = "1",
    doi = "10.1016/j.euromechsol.2019.103805",
    language = "English",
    volume = "77",
    journal = "European Journal of Mechanics. A, Solids",
    issn = "0997-7538",
    publisher = "Elsevier",

    }

    Computational homogenisation of acoustic metafoams. / Lewińska, M.A.; Kouznetsova, V.G.; van Dommelen, J.A.W. (Corresponding author); Geers, M.G.D.

    In: European Journal of Mechanics. A, Solids, Vol. 77, 103805, 01.09.2019.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Computational homogenisation of acoustic metafoams

    AU - Lewińska,M.A.

    AU - Kouznetsova,V.G.

    AU - van Dommelen,J.A.W.

    AU - Geers,M.G.D.

    PY - 2019/9/1

    Y1 - 2019/9/1

    N2 - Acoustic metafoams are novel materials recently proposed for low frequency sound attenuation. The design of their microstructure is based on the combination of standard acoustic foams with locally resonant acoustic metamaterials. This results in improved sound attenuation properties due to the interaction between viscothermal dissipation effects and the local resonance effects at the pore level. In this paper, the non-standard behaviour of such a metafoam with a complex two-phase microstructure is analysed through a multiscale approach. The macroscopic problem is described by general balance equations and at the microscopic scale a detailed representation of the microstructure is considered. The frequency dependent effective properties are used to explain the extraordinary acoustic performance. The homogenisation approach is also validated using direct numerical simulations, showing that the homogenisation technique is adequate in modelling both viscothermal dissipation and the local resonance effect within the metafoam microstructure.

    AB - Acoustic metafoams are novel materials recently proposed for low frequency sound attenuation. The design of their microstructure is based on the combination of standard acoustic foams with locally resonant acoustic metamaterials. This results in improved sound attenuation properties due to the interaction between viscothermal dissipation effects and the local resonance effects at the pore level. In this paper, the non-standard behaviour of such a metafoam with a complex two-phase microstructure is analysed through a multiscale approach. The macroscopic problem is described by general balance equations and at the microscopic scale a detailed representation of the microstructure is considered. The frequency dependent effective properties are used to explain the extraordinary acoustic performance. The homogenisation approach is also validated using direct numerical simulations, showing that the homogenisation technique is adequate in modelling both viscothermal dissipation and the local resonance effect within the metafoam microstructure.

    KW - Acoustic foams

    KW - Acoustic metamaterials

    KW - Computational homogenisation

    KW - Local resonance

    KW - Metafoams

    KW - Poro-elastic materials

    KW - Viscothermal dissipation

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