Abstract
The acoustic impact from industrial-grade wind turbines was studied for turbines located in Cape Cod, Massachusetts. Narrowband and one-third-octave band infrasonic and low frequency measurements were performed at a residence located in proximity to the Vestas V82-1.65 MW wind turbines. Surveys were undertaken inside and outside the residence on multiple occasions under various wind speeds and wind directions. In each case, measurements were performed using an infrasonic microphone prior to, during, and following the nightly shutdown period of the turbines. The spectral results show the existence of discernible tones occurring at the blade passage frequency and its harmonics during operation and absent with the turbines secured. Additional tones where found in the very low audible frequency range with sidebands separated by the blade passage frequency. Comparisons have been made of the indoor and outdoor measurements as well as the effect of wind speed and direction on tone amplitude and prominence. The u...
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