Sökning: "Nils-Erik Hörlin"

Hittade 4 avhandlingar innehållade orden Nils-Erik Hörlin.

  1. 1. A study of hierarchical FE solutions of Biot's equations for acoustic modeing of poroelastic medial

    Författare :Nils-Erik Hörlin; KTH; []
    Nyckelord :FEM; Hierarchical finite element; p-version finite element; Porous materials; Poroelastic material; Biot s equations; Noise and vibration control; Solid displacement - fluid displacement; Convergence;

    Sammanfattning : .... 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. A Vibro-Acoustic Study of Vehicle Suspension Systems : Experimental and Mathematical Component Approaches

    Författare :Eskil Lindberg; Nils-Erik Hörlin; Peter Göransson; Henry Rice; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Vehicle suspension; Disc brake; Wheel rim Roughness noise; Interior tyre-road noise Component mode synthesis; Undeformed coupling interface;

    Sammanfattning : The objective of the present work is to study the vehicle suspension as a vibro-acoustic system of high complexity, consisting of many sub-systems with fundamentally different acoustical properties. In a parallel numerical and experimental modelling effort, important contributions to the understanding of its behaviour have been achieved. LÄS MER

  4. 4. Vehicle Disc Brake Roughness Noise : Experimental Study of the Interior Noise andVibro-Acoustic Modelling of Suspension Systems

    Författare :Eskil Lindberg; Nils-Erik Hörlin; Peter Göransson; Wolfgang Kropp; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustics; disc brake; surface topography; wire brush noise; roughness noise; component mode synthesis; vehicle suspension;

    Sammanfattning : Prediction of vehicle disc brake roughness noise is a non-trivial challenge. In fact, neither the source mechanisms, nor the transfer paths are so far well understood. LÄS MER