Wind Turbine Noise Assessment     



The calculation of wind turbine noise is described by the standard ISO 9613-2.

This shows that the turbine noise output will reduce due to the following factors:

Distance

Air absorption

Ground absorption

Barriers

Turbine noise increases as wind speed increases, but background noise increases more, which helps to mask the noise.

The noise produced by a wind turbine at different wind speeds is specified, and guaranteed, by its manufacturer.

Using the methodology defined by the ISO 9613-2 the noise at a given distance from the turbine can be calculated.

Through our membership of the Institute of Acoustics we are very familiar with the current guidelines, as defined by “The assessment and rating of wind farm noise” ETSU- R-97  and the IOA Good Practice Guide are that the noise levels at a residence should ideally be below 35 dB(A) during amenity times (evenings and most of the weekend) and 43 dB(A) at night. The night time level assumes that the occupant will be indoors and the noise will be reduced by at least 10 dB by the windows, even if they are open for ventilation.

If the turbine noise is predicted to exceed the above levels then it is necessary to monitor background noise levels and to show that these will be within 5 dB of the maximum noise that the turbines will make.














FOR INFORMATION ON THE COLLECTION OF BACKGROUND NOISE DATA CLICK HERE

Background Noise Compliance Testing

Call: 01467 643113

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