Infrasound Measurements from Wind Turbines under Various Atmospheric Conditions
Résumé
Infrasound exposure has become a main cause of opposition towards new wind turbine projects. In order to assess its relevance, simultaneous recordings with two low-frequency microphones were conducted in a long term measurement campaign at close distance from a wind turbine. An ad-hoc designed and validated wind- shielding dome was used to improve the signal-to-noise ratio in the infrasonic frequency range. The acoustic measurements were accompanied by air temperature profile measurements and high acquisition frequency wind measurements. Cross- correlation between the time signals at the two recorders was applied to identify the true infrasound contribution from the wind turbines. The cross-correlated wind turbine infrasound spectra have been related to different nacelle positions, mean-wind-speed, turbulence intensity and the temperature?s vertical profile. The on-going study aims at assessing the dependency of the wind turbine infrasound intensity from atmospheric parameters.
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