All acoustic technology is built on an understanding of three primary elements: Noise sources, propagation paths, and receivers. The purpose, therefore, of this chapter is to describe in quantitative terms the specific wind turbine factors that characterize each of these. . The analysis is representative of medium-sized turbines with low tip Mach number ($ {sim} 0. The most. . Recent developments in horizontal-axis wind turbine noise research are summarised and topics that are pertinent to the problem, but are yet to be investigated, are explored and suggestions for future research are offered. The sound can be amplitude modulated. Amplitude modulations in a sound are easily detected by the human ear, but best at the modulation frequency 2–4 Hz.
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