The UK Institute of Acoustics November/December 2017 Monthly Bulletin contains this article, contributed to by Andy McKenzie et al, presenting proposed wording for a planning condition on noise for wind farms, or individual wind turbines, which takes account of amplitude modulation within the noise charecter.
The UK Institute of Acoustics November/December 2017 Monthly Bulletin contains an article setting out the proposed wording in this MS Word document for a planning condition on noise for wind farms or individual wind turbines. The full article is provided on our web site in the entry above this one.
ETSU-R-97 is a document that has remained unchanged since it was first published nearly two decades ago, despite suffering from heavy critisism over those years. McKenzie and Bullmore propose what an alternative procudure to the assessment and rating of wind farm noise in the UK might be, if ETSU-R-97 were to be superceded.
This paper gives some examples of a potential amplitude modulation (AM) assessment using the three metrics proposed in the IOA AM discussion document. Results are presented, discussing the analysis of noise measurements undertaken at a residential receptor location near a wind turbine site where operational and background noise periods were measured. Some of the issues involved are discussed. The objective of these metrics is a consistent quantification of the modulating character of the wind turbine related component of the noise, which can be implemented in a practical way.