Wind turbines produce aerodynamic noise, which is the noise produced by the rotating wind turbine blades. This noise contains a periodically fluctuating, or amplitude modulated (AM), component. This form of AM, commonly referred to as “blade swish”, is an inherent feature of the operation of all wind turbines and is perfectly normal.
The wind industry recognised that some AM exhibited characteristics that fell outside those expected
of normal AM and that these other AM characteristics were annoying to some people. The findings of this research, conducted in two phases between 2012 and 2013, identify solutions for resolving any existing issues on sites where it is found to occur.
This document comprises a summary of the work carried out.