Sökning: "aerodynamics"

Visar resultat 36 - 40 av 133 avhandlingar innehållade ordet aerodynamics.

1. 36. Aerodynamic performance in bat flight

   Författare :Jonas Håkansson; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Leptonycteris yerbabuenae; Plecotus auritus; Glossophaga soricina; PIV; aerodynamics; wing morphology; bats; wind tunnel; animal flight;

   Sammanfattning : Bats are the only mammals capable of flight, and they are the only animal flyers that are mammals. This thesis focuses on the latter of those facts, and investigates how bats fly, from an aerodynamic perspective. LÄS MER

3. 37. On Aerodynamic and Aeroelastic Modeling for Aircraft Design

   Författare :Mikaela Lokatt; Ulf Ringertz; David Eller; Holger Mai; KTH; []
   Nyckelord :viscous-inviscid interaction model; laminar flow wing; aerodynamics; aeroelasticity; aircraft design; Flyg- och rymdteknik; Aerospace Engineering;

   Sammanfattning : The work presented in this thesis was performed with the aim of developing improved prediction methods for aerodynamic and aeroelastic analysis to be used in aircraft design. The first part of the thesis concerns the development of a viscous-inviscid interaction model for steady aerodynamic predictions. LÄS MER

4. 38. On the modelling and partial-load control of variable-speed wind turbines

   Författare :Peter Novak; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; controller; estimation; physical pareameters; modelling; wind turbine; tip-speed ratio; identification; quantization; aerodynamics; drive system;

   Sammanfattning : .... LÄS MER

5. 39. Wakes behind wind turbines - Studies on tip vortex evolution and stability

   Författare :Ylva Odemark; Jens Fransson; Jens Madsen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind power; aerodynamics; hot-wire anemometry; vortex dynamics;

   Sammanfattning : The increased fatigue loads and decreased power output of a wind turbine placed in the wake of another turbine is a well-known problem when building new wind power farms. In order to better estimate the total power output of a wind power farm, knowledge about the development and stability of wind turbine wakes is crucial. LÄS MER

7. 40. Sound propagation from sustainable ground vehicles : from aeroacoustic sources to urban noise

   Författare :Nicolas Pignier; Ciarán O'Reilly; Susann Boij; Gwenael Gabard; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sound propagation; sound generation; ground vehicle; aeroacoustics; aerodynamics; Kirchhoff approximation; detached eddy simulation; Ffowcs Williams and Hawkings; ljudutberdning; ljudalstring; markfordon; aeroakustik; aerodynamik; Kirchhoff approximation; detached eddy simulation; Ffowcs Williams and Hawkings; Vehicle and Maritime Engineering; Farkostteknik; Engineering Mechanics; Teknisk mekanik;

   Sammanfattning : Transportation is the main source of environmental noise in Europe, with an estimated 125 million people affected by excessive noise levels from road traffic, causing a burden of noise related diseases and having a substantial economic impact on society. In order to reduce exposure to high levels of traffic noise, two approaches are the topic of extensive research: preventing sound from propagating from roads and railways using for example noise barriers, and reducing the sources of noise themselves. LÄS MER