1,721,199 research outputs found
Turbulent-boundary-layer trailing-edge noise reduction technologies including porous materials
No full textNoise reduction is one of the major challenges to the societal acceptance of wind turbines. Aerodynamic noise sources are the dominant ones, assuming that mechanical noise can be reduced by correct insulation and periodic maintenance of the gearbox and drive train and by adding insulating material in the wind-turbine nacelle. The dominant aerodynamic noise source is turbulent boundary layer trailing edge noise, caused by the scattering of the pressure fluctuations beneath the turbulent boundary layer at the trailing edge of an airfoil. In order to reduce this source of noise, several strategies have been proposed such as: optimized airfoil design for noise performances; installation of add-ons such as brushes or trailing-edge serrations; and recently, permeable materials at the trailing edge. In this chapter, after a brief introduction to the aerodynamic noise sources, the noise reduction physical mechanisms of trailing-edge serrations, as an industrial state-of-the-art solution, and of porous materials, as an innovative noise reduction strategy, will be discussed.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
Il lavoro nelle organizzazioni. Repertorio Bibliografico di Psicologia del Lavoro 1970/1999.
No full textQuaderni di Psicologia del Lavor
Psicologia del Lavoro e delle Organizzazioni. Costruire e Gestire Relazioni nei Contesti Professionali e Sociali.
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