Amplitude modulation of sound from wind turbines under various meteorological conditions | Zendy

Conny Larsson | Zendy; Olof Öhlund | Zendy

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Amplitude modulation of sound from wind turbines under various meteorological conditions

Author(s) -

Conny Larsson,

Olof Öhlund

Publication year - 2014

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.4836135

Subject(s) - sound (geography) , amplitude , acoustics , environmental science , interference (communication) , amplitude modulation , wind speed , modulation (music) , speed of sound , geology , meteorology , physics , frequency modulation , computer science , telecommunications , optics , radio frequency , channel (broadcasting)

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.

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