Criteria for wind farm noise: Lmax and Lden
The Journal of the Acoustical Society of America |Frits van den Berg|Jun 6, 2008
This paper discusses how to derive the long-term average sound level of a turbine or cluster of turbines from Lmax by taking into account the regional climatology. The abstract of this paper is provided below. The full paper can be downloaded from the document links on this page.
This paper discusses how to derive the long-term average sound level of a turbine or cluster of turbines from Lmax by taking into account the regional climatology. The abstract of this paper is provided below. The full paper can be downloaded from the document links on this page.
Abstract
Wind turbine noise limits are based on either the highest sound immission level (Lmax) or several sound immission levels for a series of wind speed classes (Lmax,v). As yet no procedure has been proposed to determine the day-evening-night sound level (Lden) that is now commonly used in the European Union for all noise sources. Wind speed dependent rating wind turbine noise levels Lr,v can be predicted based on climatological data. This has been verified by measurements over a nine month period for a wind farm at a coastal location in the Netherlands. From these measurements also the long term average sound level Lden can be determined. Lden can also be determined from previously published wind speed measurements at an inland location over one year. The procedure shows that for a wind turbine or wind farm the Lden can be derived from Lmax by taking into account the regional climatology.
