Sökning: "struts"

Visar resultat 1 - 5 av 13 avhandlingar innehållade ordet struts.

  1. 1. Analytical and Parametric Study of Damped Vibrations in Gough-Stewart Platforms

    Författare :Behrouz Afzali Far; Lunds universitet.; Lund University.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This work establishes a comprehensive and fully parametric model for the damped vibrations of Gough-Stewart Platforms (GSPs) at symmetric configurations. It is noteworthy that in the literature a complete solution to this problem has not been presented. This work has been carried out in three stages which are the subjects of Papers I, II and III. LÄS MER

  2. 2. Fluid mechanical simulations and development for vertical axis turbines

    Detta är en avhandling från Uppsala : Institutionen för teknikvetenskaper, Uppsala universitet

    Författare :Anders Goude; Uppsala universitet.; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The aerodynamics of vertical axis turbines is typically studied using streamtube, vortex or CFD models. This thesis focuses on the first two models, which are the computationally faster ones. LÄS MER

  3. 3. A new perspective on avian phylogeny - a study based on mitochondrial genomes

    Detta är en avhandling från Department of Genetics, Lund University

    Författare :Anna Bartosch-Härlid; Lunds universitet.; Lund University.; [1999]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Genetics; thyroid; neoteni; mitochondrial DNA; phylogeny; Class Aves; Palaeognathae; cytogenetics; Genetik; cytogenetik;

    Sammanfattning : Popular Abstract in Swedish Nu levande fåglar delas traditionellt in i två grupper. Den ena gruppen är Palaeognathae och omfattar ratiter (struts, nandu etc.) och stubbstjärthöns. Den andra gruppen, Neognathae, representerar alla övriga fåglar, drygt 20 ordningar med över 9. LÄS MER

  4. 4. Fluid Mechanics of Vertical Axis Turbines Simulations and Model Development

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anders Goude; Uppsala universitet.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind power; Marine current power; Vertical axis turbine; Wind farm; Channel flow; Simulations; Vortex model; Streamtube model; Control system; Graphics processing unit; CUDA; Fast multipole method; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : Two computationally fast fluid mechanical models for vertical axis turbines are the streamtube and the vortex model. The streamtube model is the fastest, allowing three-dimensional modeling of the turbine, but lacks a proper time-dependent description of the flow through the turbine. LÄS MER

  5. 5. Numerical and Experimental Investigations on Aerodynamic and Thermal Aspects of Rotating Wheels

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Alexey Vdovin; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ventilation resistance; wind tunnel; brake cooling; ride height; aerodynamic moment; CFD; rim design; vehicle aerodynamics;

    Sammanfattning : With todays and future environmental legislations for CO2 and other emission gases, all vehicle manufacturers are forced to further develop tools and methods to make their vehicles more energy efficient and environmentally friendly. One option to achieve this is to reduce the aerodynamic resistance since it has a significant influence on the vehicle fuel consumption, especially for velocities higher than 50 km/h. LÄS MER