Salford studies what noise annoys

Government-sponsored research by Salford University has shown that aerodynamic modulation noise is not a significant issue for UK wind farms.


Government-sponsored research by SalfordUniversity has shown that aerodynamic modulation (AM) noise is not a significant issue for UK wind farms.



AM is a rhythmic pulsating aerodynamic noise from wind turbines that is louder than the normal degree of regular fluctuation of blade swoosh.



The study commissioned by government departments BERR, DCLG and Defra assessed 133 operational wind projects across Britain. It found that although the occurrence of AM is hard to predict, it has a low incidence rate and low numbers of people are adversely affected by it.



Energy Minister Malcolm Wicks said: ‘Where there are legitimate problems we will address them. But it is essential that we produce more wind power if we are to meet our climate change and security of supply aims.’



Out of all the working wind farms at the time of the study, there were four cases where AM appeared to be a factor. Complaints have subsided for three out of these four sites, in one case as a result of remedial treatment in the form of a wind turbine control system. In the remaining case, which is a recent installation, investigations are ongoing.