Sökning: "elasto-acoustic"

Hittade 3 avhandlingar innehållade ordet elasto-acoustic.

  1. 1. Numerical Modelling of Dynamics of Light Porous Materials

    Författare :Peter Göransson; Teknisk akustik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mechanical engineering; glass fibre; foam; material characterisation; elasto-acoustic; fluid-structure interaction; finite element; Biot; porous material; hydraulics; vacuum technology; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik;

    Sammanfattning : Porous materials are among the most commonly used materials for noise and vibration reduction in modern transportation vehicles. To design, industrially relevant, weight and cost effective noise and vibration measures, there is a need for general prediction models capable of representing the elasto-acoustic behaviour of such materials. LÄS MER

  2. 2. Hierarchical finite element modelling of Biot's equations for vibro-acoustic modelling of layered poroelastic media

    Författare :Nils-Erik Hörlin; Peter Göransson; Frank Ihlenburg; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Engineering physics; finite element; hierarchical; Biot; porous material; vibro-acoustic; Teknisk fysik; Engineering physics; Teknisk fysik;

    Sammanfattning : This thesis concerns three-dimensional finite element modelling of Biot's equations for elasto-acoustic modelling of wave propagation in layered media including porous elastic materials. The concept of hierarchical (p-version) finite elements are combined with various weak forms of Biot's equations. LÄS MER

  3. 3. Efficient Finite Element Approach for Structural-Acoustic Applications including 3D modelling of Sound Absorbing Porous Materials

    Författare :Romain Rumpler; Peter Göransson; Jean-François Deü; Henry Rice; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Noise reduction; Poroelastic materials; Reduced model; Component mode synthesis; Padé approximants; Structural-acoustics; Finite element method; Fluid-structure interaction.; Matériaux poroélastiques; Modèles réduits; Sous-structuration dynamique; Approximants de Padé; Vibroacoustique interne; Eléments finis; Interaction fluid-structure.; Järnvägsgruppen - Ljud och vibrationer; Järnvägsgruppen - Ljud och vibrationer;

    Sammanfattning : In the context of interior noise reduction, the present work aims at proposing Finite Element (FE) solution strategies for interior structural-acoustic applications including 3D modelling of homogeneous and isotropic poroelastic materials, under timeharmonic excitations, and in the low frequency range. A model based on the Biot-Allard theory is used for the poroelastic materials, which is known to be very costly in terms of computational resources. LÄS MER