Sökning: "Flutter"

Visar resultat 11 - 15 av 40 avhandlingar innehållade ordet Flutter.

  1. 11. Aeroelastic Concepts for Flexible Aircraft Structures

    Författare :Sebastian Heinze; Dan Borglund; Rick Lind; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeroelasticity; active aeroelastic aircraft structures; aeroelastic control; wind-tunnel testing; flutter analysis; robust flutter analysis; worst-case configuration; Vehicle engineering; Farkostteknik;

    Sammanfattning : In this thesis, aeroelastic concepts for increased aircraft performance are developed and evaluated. Active aeroelastic concepts are in focus as well as robust analysis concepts aiming at efficient analysis using numerical models with uncertain or varying model parameters. LÄS MER

  3. 12. Catheter Ablation of Atrial Fibrillation and Atrial Flutter : A Comparison of Cryo and Radiofrequency Techniques

    Författare :Helena Malmborg; Carina Blomström-Lundqvist; Stefan Lönnerholm; Pekka Raatikainen; Uppsala universitet; []
    Nyckelord :;

    Sammanfattning : Atrial fibrillation (AF) and atrial flutter (AFl) are two of the most common arrhythmias encountered in the population. Catheter ablation has emerged as a useful tool in the treatment of these arrhythmias. Although radiofrequency (RF) is the most commonly used energy source for ablation, cryoenergy may have some advantageous properties. LÄS MER

  4. 13. Risk markers and incidence of atrial fibrillation in northern Sweden

    Författare :Cecilia Johansson; Lars Johansson; Jonas Andersson; Marcus Lind; Marie Eriksson; Mårten Rosenqvist; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Atrial fibrillation; atrial flutter; incidence; provoking factors; types of atiral fibrillation; stroke risk; alcohol consumption; problem drinking; weight; height; weight change; normal blood pressure; high normal blood pressure; Förmaksflimmer; förmaksfladder; incidens; provocerande faktorer; typer av förmaksflimmer; strokerisk; alkoholkonsumtion; alkoholproblem; vikt; längd; viktförändring; normalt blodtryck; högt normalt blodtryck; medicin; Medicine;

    Sammanfattning : Background: Atrial fibrillation (AF) is the most common clinically significant arrythmia with a prevalence of approximately 3% in the general population. Less is known about the incidence of AF. In order to reduce the incidence of AF, it is of essence to identify modifiable risk factors for the disease. LÄS MER

  5. 14. Numerical investigation of blade flutter at or near stall in axial turbomachines

    Författare :Wolfgang Höhn; KTH; []
    Nyckelord :;

    Sammanfattning : During the design of the compressor and turbine stages oftoday's aeroengines aerodynamically induced vibrations becomeincreasingly important since higher blade load and betterefficiency are desired. Aerodynamically induced vibrations inturbomachines can be classified into two general categories,i.e. LÄS MER

  7. 15. Fluid-structure integrated computational methods for turbomachinery blade flutter and forced response predictions

    Författare :Francois Moyroud; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER