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Prediction of the far field noise from wind energy farmsThe basic physical factors involved in making predictions of wind turbine noise and an approach which allows for differences in the machines, the wind energy farm configurations and propagation conditions are reviewed. Example calculations to illustrate the sensitivity of the radiated noise to such variables as machine size, spacing and numbers, and such atmosphere variables as absorption and wind direction are presented. It is found that calculated far field distances to particular sound level contours are greater for lower values of atmospheric absorption, for a larger total number of machines, for additional rows of machines and for more powerful machines. At short and intermediate distances, higher sound pressure levels are calculated for closer machine spacings, for more powerful machines, for longer row lengths and for closer row spacings.
Document ID
19860015744
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Shepherd, K. P. (Bionetics Corp. Hampton, VA, United States)
Hubbard, H. H. (Bionetics Corp. Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1986
Subject Category
Acoustics
Report/Patent Number
NAS 1.26:177956
NASA-CR-177956
Accession Number
86N25215
Funding Number(s)
CONTRACT_GRANT: NAS1-16978
PROJECT: RTOP 776-31-41-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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