Sökning: "electrodynamic"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet electrodynamic.

  1. 1. Electrodynamic field at spatial infinity

    Master-uppsats, KTH/Fysik

    Författare :Jakob Myhrman; [2022]
    Nyckelord :Spatial infinity; Conformal rescaling; Minkowski space; Penrose Diagram; Einstein universe; Newman-Penrose formalism; Sigma-process; Resolution of singularities; Maxwell s equations; Cylinder at spatial infinity; Rumslig oändlighet; Konform omskalning; Minkowski rummet; Penrose Diagram; Einsteins universum; Newman-Penrose formalismen; Sigma-processen; Singularitetupplösning; Maxwells ekvationer; Cylindern vid rumslig oändlighet;

    Sammanfattning : The treatment of spatial infinity is one of the remaining major open problems in the theory of isolated self-gravitating systems. Especially when one wants to model scattering of gravitational radiation in spacetime. In this thesis the conformal theory is used to study simple electromagnetic fields, close to spatial infinity. LÄS MER

  3. 2. Evaluating Topology Optimization as an alternative methodology for developing Vibration Test Fixtures

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Jenny Helene Bolle; [2020]
    Nyckelord :Topology Optimization; Vibration test fixtures; Additive Manufacturing;

    Sammanfattning : This thesis evaluates an alternative method for creating vibration test fixtures. The new method is based on producing fixtures by utilizing the external forces, that a fixture is subjected to during vibration tests, instead of creating it with estimations and guess-work, as it is done today. LÄS MER

  4. 3. Modeling and Compensation of Nonlinear Distortion in High Efficient Electrodynamic Loudspeakers

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Signaler och system

    Författare :Caroline Holmström; [2020]
    Nyckelord :;

    Sammanfattning : Loudspeakers transform electrical energy into acoustic waves but most of the electrical energy is lost as heat. It is possible to increase the electro-acoustic efficiency by changing the electrical, mechanical or acoustical design of the loudspeaker but with these changes come unwanted side effects. LÄS MER

  5. 4. Experimental Investigation of Added Mass and Damping on a Model Kaplan Turbine for Rotor Dynamic Analysis

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Timmy Nyman; [2018]
    Nyckelord :Added mass; added damping; rotor dynamics; kaplan turbine; vibrations; fluid dynamics;

    Sammanfattning : The concept of added hydrodynamic properties such as added mass is of importance in modern hydropower development, mainly for rotor dynamic calculations. Added mass could result in reduced natural frequencies and altered mode compared to existing simulation models. LÄS MER

  7. 5. Experimental and numerical fluid-structure interaction analysis of a suspended rod subjected to forced vibrations

    Master-uppsats, KTH/Marina system

    Författare :David Ahlsén; [2018]
    Nyckelord :;

    Sammanfattning : This study is evaluating Solid-Acoustic Finite Element modelling as a method for calculating structural vibration response in water. When designing for example vehicles, it is important to avoid vibrational resonance in any part of the structure, as this causes additional noise and reduced lifespan. LÄS MER