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  • Fégeant, OlivierKTH,Byggnader och installationer (author)

Noise from wind turbines

  • BookEnglish2001

Publisher, publication year, extent ...

  • Stockholm :Institutionen för byggnader och installationer,2001
  • ix, 17 s.
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-3100
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3100URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:vet swepub-contenttype
  • Subject category:dok swepub-publicationtype

Series

  • Meddelande. Inst. för byggnadsteknik,0346-5918 ;184

Notes

  • QC 20100616
  • A rapid growth of installed wind power capacity is expectedin the next few years. However, the siting of wind turbines ona large scale raises concerns about their environmental impact,notably with respect to noise. To this end, variable speed windturbines offer a promising solution for applications in denselypopulated areas like the European countries, as this designwould enable an efficient utilisation of the masking effect dueto ambient noise. In rural and recreational areas where windturbines are sited, the ambient noise originates from theaction of wind on the vegetation and about the listener's ear(pseudo-noise). It shows a wind speed dependence similar tothat of the noise from a variable speed wind turbine and cantherefore mask the latter for a wide range of conditions.However, a problem inherent to the design of these machines istheir proclivity to pure tone generation, because of theenhanced difficulty of avoiding structural resonances in themechanical parts. Pure tones are deemed highly annoying and areseverely regulated by most noise policies. In relation to thisproblem, the vibration transmission of structure-borne sound tothe tower of the turbine is investigated, in particular whenthe tower is stiffened at its upper end. Furthermore, sincenoise annoyance due to wind turbine is mostly a masking issue,the wind-related sources of ambient noise are studied and theirmasking potentials assessed. With this aim, prediction modelsfor wind-induced vegetation noise and pseudo-noise have beendeveloped. Finally, closely related to the effect of masking,is the difficulty, regularly encountered by local authoritiesand wind farm developers, to measure noise immission from windturbines. A new measurement technique has thus been developedin the course of this work. Through improving thesignal-to-noise ratio between wind turbine noise and ambientnoise, the new technique yields more accurate measurementresults. Keywords: Masking, vibration transmission, diffraction,ambient noise, pseudo-noise, cylindrical shell, perturbationmethods, structural mobility, acoustic outdoor measurement.

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  • KTHByggnader och installationer (creator_code:org_t)

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By the author/editor
Fégeant, Olivier
About the subject
ENGINEERING AND TECHNOLOGY
ENGINEERING AND ...
and Civil Engineerin ...
and Building Technol ...
Parts in the series
Meddelande. Inst ...
By the university
Royal Institute of Technology

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Fégeant, Olivier
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