Amplitude Modulation of aerodynamic noise is a term used to describe a noise phenomenon experienced at a few unusual wind energy projects in the UK. The term is often used to cause concern amongst residents close to a proposed wind farm in addition to terms such as low frequency noise and infrasound. It is sometimes described as a “thump” as the turbine blade passes the tower.
A recently published report by Salford University confirms that this phenomenon has occurred at 4 wind farms out of 126 and may be occurring at a further 8 in the UK. Exactly what the cause of the effect is appears uncertain however the issue appears to have been resolved through wind turbine control at all sites in the UK, except one, where investigations continue.
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