The acoustic insulation performance of conventional panels and structures is mainly driven by their mass. Silence often requires heavy constructions, which conflicts with the emerging tendency towards lightweight design. To face the challenging and often conflicting task of merging acoustic and lightweight requirements, novel low mass and compact volume acoustic solutions are required. Vibro-acoustic metamaterials with stopband behaviour come to the fore as possible candidates for novel acoustic solutions combining lightweight requirements with superior noise and vibration insulation, be it at least in some targeted and tuneable frequency ranges, referred to as stopbands. Metamaterials are artificial materials or structures engineered from conventional materials to exhibit some targeted performance that clearly exceeds that of conventional materials. They consist typically of (often periodic) assemblies of unit cells of non-homogeneous material composition and/or topology. Their superior performance may arise from the intrinsic properties of the individual unit cells and from the mutual interaction between the cells. This paper describes a novel metamaterial concept based on sandwich structures with embedded resonant structures that exhibit vibro-acoustic stopband behaviour. A metamaterial encapsulation is designed and produced to showcase the potential of this type of metamaterials to improve acoustic insulation performance in targeted frequency ranges. As compared to classic encapsulations made from homogeneous panels, the acoustic insertion loss from the metamaterial is strongly increased within the stop band region of the metamaterial without increasing the mass and hardly increasing the volume. These metamaterials can be achieved through a variety of designs or production processes, depending on the application, and can offer technological benefits such as possible integration in structural parts, use in harsh environments and ease of design of the beneficial frequency ranges, paving the way for a new class of light and compact noise control solutions with ample applications in automotive for low and mid frequency noise mitigation.


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    Titel :

    Innovative vibro-acoustic metamaterials to provide lightweight NVH solutions


    Beteiligte:
    Claeys, Claus (Autor:in) / Pluymers, Bert (Autor:in) / Desmet, Wim (Autor:in)


    Erscheinungsdatum :

    2014


    Format / Umfang :

    8 Seiten, Bilder, Tabellen, 9 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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