Search for dissertations about: "wave porous"
Showing result 1 - 5 of 17 swedish dissertations containing the words wave porous.
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1. Push the limitations of crystal structure determination by 3D electron diffraction : From inorganic porous materials to biomolecules
Abstract : Structure elucidation is fundamental to understanding the chemical and physical properties of a material. Three-dimensional electron diffraction (3D ED) has shown great power for structure determination of nanometer- or submicrometer-sized crystals that are either too small or too complex for X-ray diffraction. READ MORE
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2. A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels
Abstract : The present work explores the possibilities of adapting poro-elastic lightweight acoustic materials to specific applications. More explicitly, a design approach is presented where finite element based numerical simulations are combined with optimization techniques to improve the dynamic and acoustic properties of lightweight multilayered panels containing poro-elastic acoustic materials. READ MORE
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3. Wave Splitting and Effective Boundary Conditions for Structural Elements
Abstract : The subject of this thesis is twofold. The first part concerns the wave splitting of structural elements. The second part concerns approximate boundary conditions for fluid-loaded thin plates. Wave splitting is a mathematical tool for the formulation of scattering problems in the time domain that aims at solving inverse problems, e. READ MORE
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4. Wave Modelling Techniques for Medium and High Frequency Vibroacoustic Analysis Including Porous Materials
Abstract : Numerical methods based on wave modelling are explored for the vibroacoustic analysis of wave propagation, sound transmission and interior noise in vehicles and buildings at medium and high frequencies. The presence of sound absorbing porous materials in practical engineering structures is also considered. READ MORE
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5. Hierarchical finite element modelling of Biot's equations for vibro-acoustic modelling of layered poroelastic media
Abstract : 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. READ MORE