Necessary adjustments in ISO 9613-2 and CNOSSOS (industries) methods for noise forecasting in Wind Farms – Vitor Rosão, Rui Leonardo, Pedro Santos. Euronoise 2021 (Funchal, Madeira, Portugal).

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The European Directive 2015/996, of 19 May 2015, establishes common noise assessment methods
(typically referred as CNOSSOS methods) within the European space, pursuant to Directive 2002/49/EC, of
the European Parliament and of the Council. Thus, it is natural that the development of noise modelling of
wind farms will be carried out based on the CNOSSOS method for industrial noise sources. The CNOSSOS
method for industrial noise sources is based on the method of the standard ISO 9613-2: 1996. This article
presents the precautions that must be taken when using these methods (CNOSSOS or ISO 9613-2) for noise
modelling of wind farms, because, in some cases, an “unsafety” modelling may result in an underestimation
of the sound levels perceived in the Receivers. This article therefore presents, and justifies, some
recommendations on how to use the CNOSSOS or ISO 9613-2 methods, for safer predictions of sound levels
in Receivers, due to the noise of Wind Farms.
Keywords: CNOSSOS, European Directive 2015/996, ISO 9613-2, Wind Farm Noise, Wind Turbine Noise

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Vitor Rosão, Rui Leonardo, Pedro Santos. Euronoise 2021 (Funchal, Madeira, Portugal).

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