Wind Turbine Infrasound Penetration into Homes using Narrowband Measurement Techniques
Abstract
Measurements using advanced instrumentation and Narrowband 3-dimensional FFT-based signal processing indicate the presence of harmonics at infrasonic blade pass frequencies in dwellings near multiple turbines. Proposed calculations for transmissibility are outlined with simultaneous long-term measurements at four homes. Measurement validation techniques are outlined separating naturally occurring infrasound from wind turbine infrasound. Various locations inside homes are also compared to outside measurements relating wind speed, wind direction and other audible SLM parameters. Simultaneous synchronous measurements indicate levels differ in each room of a home. Higher harmonics inside homes are reduced, however, and become more distinct relative to background infrasound. Older homes with large vented attics tend to couple these pressures into rooms below.
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