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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Measurement study and noise analysis of large size wind turbine in Cearà / Estudo de mediÃÃo e anÃlise do ruÃdo de aerogeradores de grande porte no Estado do CearÃ

Samuel AraÃjo Lima 28 September 2015 (has links)
CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior / With the rapid expansion of wind power during the beginning of 21st century in Brazil and worldwide, many wind turbines of different and innovative technologies began operations. Many of the environmental and operational consequences of this expansion are still being studied and evaluated. Among the environmental consequences, one can mention the noise produced by larger diameter wind turbines, whose frequencies are often not audible, although perceptible to the human brain. In this work were made measurements of the noise associated with wind turbines in the state of Ceara. It was initially made the characterization of wind turbine noise, identifying sources, frequencies, composition, intensity and impacts to health. Experimental measurements of sound in large wind generators were made in direct-drive wind turbine generators, in the city of Aracati, State of Ceara, in the light of the international standard IEC 61400-11, documenting the methodology applied in a manner that is easily replicated. The experimental results were processed and analyzed according to the standard. Filters were applied in order to identify the frequency and types of most significant noise in the experiment, comparing them with the literature. The procedures performed and documented may be applied commercially to perform noise measurements under international standard, and in future studies applied to predictive maintenance and environmental engineering. / Com a rÃpida expansÃo da Energia EÃlica ocorrida no inÃcio do SÃculo XXI no Brasil e no mundo, muitos aerogeradores de tecnologias distintas e inovadoras iniciaram suas operaÃÃes. Muitas das consequÃncias ambientais e operacionais dessa expansÃo ainda estÃo sendo estudadas e avaliadas. Entre as consequÃncias ambientais pode-se citar o ruÃdo provocado pelo funcionamento de aerogeradores de maior diÃmetro, cujas frequÃncias nÃo sÃo muitas vezes audÃveis, ainda que perceptÃveis ao cÃrebro humano. Neste trabalho foram feitas mediÃÃes do ruÃdo associado a aerogeradores no Estado do CearÃ. Foi feita inicialmente a caracterizaÃÃo do ruÃdo de aerogeradores, identificando fontes, frequÃncias, composiÃÃo, intensidades e impactos à saÃde. Foram realizadas mediÃÃes experimentais de som em Aerogeradores de grande porte do tipo direct-drive na cidade de Aracati, no Estado do CearÃ, à luz da norma internacional IEC 61400-11, documentando a metodologia aplicada de forma que seja facilmente replicada. Os resultados experimentais foram tratados e analisados conforme a norma. Filtros foram aplica- dos a fim de se identificar as frequÃncias e o tipos de ruÃdos mais relevantes no experimento, comparando-os com a literatura. Os procedimentos executados e documentados poderÃo ser aplicados comercialmente para a realizaÃÃo de mediÃÃes de ruÃdos à luz da norma internacional, e em estudos futuros aplicados à manutenÃÃo preditiva e à engenharia ambiental.

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