Airborne Noise Emission Characteristics of Wind Turbines in Iran

Wind-turbine noise emission and its environmental impact are considerable issues nowadays. Considering the importance of the issue, the purpose of this study was to prepare noise map and wind turbines sound characteristics on the largest wind farm of Iran. This study was carried out in two phases:1) In order to prepare the daytime sound level (Ld) noise map, environmental noise measurement was done using LAeq for 10 minutes three times daily according to the ISO9612 method. 2) On the basis of IEC 61400-11.2006, sound characteristics and wind speed were measured concurrently at the back and front of the wind turbines using TES-1358 Sound Level Meter and vane anemometer. The average daytime sound level (Ld) of wind farm was 63dBA which is 3 dB higher than the recommended level. Wind speed has a significant non-linear relationship with the wind turbine noise emissions (p