Amplitude modulation of sound from wind turbines under various meteorological conditions
2014 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 135, no 1, 67-73 p.Article in journal (Refereed) Published
Wind turbine (WT) sound annoys some people even though the sound levels are relatively low. This could be because of the amplitude modulated “swishing” characteristic of the turbine sound,which is not taken into account by standard procedures for measuring average sound levels. Studies of sound immission from WTs were conducted continually between 19 August 2011 and 19 August 2012 at two sites in Sweden. A method for quantifying the degree and strength of amplitude modulation (AM) is introduced here. The method reveals that AM at the immission points occur under specific meteorological conditions. For WT sound immission, the wind direction and sound speed gradient are crucial for the occurrence of AM. Interference between two or more WTs could probably enhance AM. The mechanisms by which WT sound is amplitude modulated are not fully understood.
Place, publisher, year, edition, pages
2014. Vol. 135, no 1, 67-73 p.
Amplitude modulation, sound propagation, meteorological conditions, Temperature inversion, Noise propagation, Wind Turbine, Interference, Refraction, Swish, Thumb
Vindkraft, Stabil skiktning, Ljudutbredning, vindkraftsbuller, vindkraftsljud
Physical Sciences Civil Engineering Meteorology and Atmospheric Sciences Climate Research
Research subject Meteorology
IdentifiersURN: urn:nbn:se:uu:diva-215584DOI: 10.1121/1.4836135ISI: 000329925100016OAI: oai:DiVA.org:uu-215584DiVA: diva2:687695
ProjectsLjud från vindkraftverk, modell-validiering-mätning
FunderSwedish Energy Agency, 32437-1