1 Scope
This part of IEC 61400 presents measurement procedures that enable noise emissions of a wind turbine to
be characterised. This involves using measurement methods appropriate to noise emission
assessment at locations close to the machine, in order to avoid errors due to sound
propagation, but far away enough to allow for the finite source size. The procedures
described are different in some respects from those that would be adopted for noise
assessment in community noise studies. They are intended to facilitate characterisation
of wind turbine noise with respect to a range of wind speeds and directions. Standardisation
of measurement procedures will also facilitate comparisons between different wind
turbines.
The procedures present methodologies that will enable the noise emissions of a single
wind turbine to be characterised in a consistent and accurate manner. These procedures
include the following:
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• location of acoustic measurement positions;
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• requirements for the acquisition of acoustic, meteorological, and associated wind turbine operational data;
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• analysis of the data obtained and the content for the data report; and
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• definition of specific acoustic emission parameters, and associated descriptors which are used for making environmental assessments.
This International Standard is not restricted to wind turbines of a particular size
or type. The procedures described in this standard allow for the thorough description
of the noise emission from a wind turbine. A method for small wind turbines is described
in Annex F.