Sökning: "unsteady"

Visar resultat 16 - 20 av 176 avhandlingar innehållade ordet unsteady.

  1. 16. On an efficient method for time-domain unsteady aerodynamics

    Författare :David Eller; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vehicle engineering; Farkostteknik;

    Sammanfattning : .... LÄS MER

  3. 17. Design, Optimization and Evaluation of a Transonic Aeroelastic Rig

    Författare :Simeng Tian; Andrew R. Martin; Mauricio Gutierrez Salas; Dieter Peitsch; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Transonic compressor; Aeroelastic rig; Design; CFD; Unsteady flow; Energiteknik; Energy Technology;

    Sammanfattning : The compressor is one of the most essential components of a modern turbomachinery engine. This component is exposed to vibrations that without proper design can damage structural integrity and lead to failure. LÄS MER

  4. 18. Unsteady aerodynamic effects on the driving stability of passenger vehicles

    Författare :Adam Brandt; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aerodynamics; wake dynamics; high speed; Vehicle dynamics; driving stability; crosswinds;

    Sammanfattning : The passenger car is a vital part of modern society, giving people the freedom of flexible travel. As technology advances, customers increase their demand for future products. The automotive industry must therefore adapt to society's requirements for energy-efficient travel, where developing low-drag vehicles is key. LÄS MER

  5. 19. Numerical Investigation of Aerodynamic Blade Excitation Mechanisms in Transonic Turbine Stages

    Författare :Björn Laumert; KTH; []
    Nyckelord :Transonic Turbines; CFD; Forced Response; Unsteady Aerodynamics;

    Sammanfattning : With the present drive in turbomachine engine developmenttowards thinner and lighter bladings, closer spaced blade rowsand higher aerodynamic loads per blade row and blade, advanceddesign criteria and accurate prediction methods for vibrationalproblems such as forced response become increasingly importantin order to be able to address and avoid fatigue failures ofthe machine early in the design process. The present worksupports both the search for applicable design criteria and thedevelopment of advanced prediction methods for forced responsein transonic turbine stages. LÄS MER

  7. 20. On an Efficient Method fo Time-Domain Computational Aeroelasticity

    Författare :David Eller; Ulf Ringertz; Paolo Mantegazza; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeroelasticity; unsteady aerodynamics; boundary element method; multidisciplinary simulation; Vehicle engineering; Farkostteknik;

    Sammanfattning : The present thesis summarizes work on developing a method for unsteady aerodynamic analysis primarily for aeroelastic simulations. In contrast to widely used prediction tools based on frequency-domain representations, the current approach aims to provide a time-domain simulation capability which can be readily integrated with possibly nonlinear structural and control system models. LÄS MER