The noise from wind turbines is generally assessed according to ISO 9613 in order to preserve the internal noise levels of the nearest sensitive receptors. Following the standard requirements, the wind turbines are considered point sources with an attenuation decay equal to 6 dB by doubling the distance. These indications should be taking into account also the air absorption at different octave bands and the gradient effects due to outdoor environmental conditions. This paper deals with the comparison of some acoustic measurements carried out in Campania (Italy) with the theoretic outcomes obtained in line with the standard ISO 9613. Different types of wind turbines have been assessed, based on a variety of power supply, distance between source and receiver and gradient of wind speed and direction. The surveys have been undertaken inside the nearest sensitive receptors with the conditions of open windows. The results highlight a drift between results, where the calculated are found to be lower than the measured-on site, underestimating the real environmental conditions.
Comparison Between Measured and Calculated Values in Relation to Noise From Wind Turbines
Iannace G.;Lombardi I.;
2022
Abstract
The noise from wind turbines is generally assessed according to ISO 9613 in order to preserve the internal noise levels of the nearest sensitive receptors. Following the standard requirements, the wind turbines are considered point sources with an attenuation decay equal to 6 dB by doubling the distance. These indications should be taking into account also the air absorption at different octave bands and the gradient effects due to outdoor environmental conditions. This paper deals with the comparison of some acoustic measurements carried out in Campania (Italy) with the theoretic outcomes obtained in line with the standard ISO 9613. Different types of wind turbines have been assessed, based on a variety of power supply, distance between source and receiver and gradient of wind speed and direction. The surveys have been undertaken inside the nearest sensitive receptors with the conditions of open windows. The results highlight a drift between results, where the calculated are found to be lower than the measured-on site, underestimating the real environmental conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
