Sökning: "forcing function"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden forcing function.

  1. 1. Experimental Investigation of Velocity Gust in High Pressure Turbines

    Författare :Kai Freudenreich; KTH; []
    Nyckelord :turbomachinery; unsteady aerodynamics; gust; forcing function; forced response; transonic flow; annular cascade; Laser-Two-Focus Anemometer; experiments;

    Sammanfattning : This thesis investigates the unsteady three-dimensional gustfield in high subsonic and transonic turbine stages based onexperimental velocity data. The generation, propagation andinteraction mechanisms of the velocity gust in high pressureturbines are studied. LÄS MER

  3. 2. Effects of coastal forcing on turbulence and boundary-layer structure

    Författare :Linda Ström; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; Meteorology; meteorologi;

    Sammanfattning : Coastal mountains of significant elevation impose constraints for the surrounding flow. The aim of this study is to describe the modifications of the marine atmospheric boundary layer that occur offshore of the west coast of the United States. Aircraft measurements, up to 1000 km off the coast from two experiments, are used. LÄS MER

  4. 3. The Influence of Flow Leakage Modelling on Turbomachinery Blade Forcing Predictions

    Författare :Tobias Gezork; Björn Laumert; Paul Petrie-Repar; Damian Vogt; Mehdi Vahdati; KTH; []
    Nyckelord :Energiteknik; Energy Technology;

    Sammanfattning : Vibrations in turbomachinery engine components are undesirable as they put the structural integrity of the components at risk and can lead to failure during the lifetime of the turbomachinery engine. Vibrations arising from aerodynamic forces and stability of turbomachinery blades is assessed in the discipline of aeromechanics. LÄS MER

  5. 4. Investigations of problems related to the choice of the initial state for numerical weather prediction models

    Författare :Stefan Gollvik; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In numerical prediction models, where the wind and mass fields are described as free variables (so called primitive equation models), the initial state has to be carefully chosen, to avoid spurious oscillations in the forecast. This thesis deals with this initialization problem. LÄS MER

  7. 5. Code Optimisation Techniques for Lazy Functional Languages

    Författare :Urban Boquist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; graph reduction; garbage collection; lazy functional languages; program transformation; interprocedural register allocation; graph colouring; intermediate code; code optimisation; compiler back-end;

    Sammanfattning : This thesis describes a complete compiler back-end for lazy functional languages, which uses various interprocedural optimisations to produce highly optimised code. The most important contributions of this work are the following. LÄS MER