Wind turbine noise
Over the last five years an enormous number of wind turbines have been installed in Europe, bringing wind energy into public awareness. However, its further development is restricted mainly by public complaints caused by visual impact and noise.
The European Commission has therefore funded a number of research projects in the field of wind turbine noise within the JOULE program. This book presents the most relevant results of these projects.
The book addresses all relevant aspects of wind turbine noise, namely: noise reduction, noise propagation, noise measurement, and an introduction to aeroacoustics. It may serve as a first reference in the field of wind turbine noise for researchers, planners, and manufacturers.
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Noise and its Effects
Introduction to Aeroacoustics
Noise Mechanisms of Wind Turbines
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A-weighted A-weighted sound acoustic analogy acoustic pressure aeroacoustic aerodynamic aerodynamic noise airfoil angle of attack atmospheric turbulence beveled blade tip boundary layer calculated Chapter chord length component convection dB(A delta function density depends described dipole direction displacement thickness distance downwind Figure flow visualization fluid force formulas Fourier frequency Hz given Grosveld ground effect harmonic high-frequency inflow turbulence inflow-turbulence noise influence interaction loading low-frequency noise Lowson Mach number microphone monopole noise mechanisms noise propagation noise radiation noise sources observer parabola parameters performed prediction models quadrupole reduction region Reynolds number rotating rotor blade shadow zone shape signal sound field sound power level sound pressure level sound propagation sound rays source height spectra spectrum Strouhal number tip noise tip vortex tonal tower trailing-edge noise turbulence intensity turbulent eddies turbulent flow typical upwind vector velocity wave equation wave number wavelength wind energy wind speed wind tunnel wind turbine noise