Mestrado em Engenharia Elétrica

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http://repositorio.ufes.br/handle/10/17619

Nível: Mestrado Acadêmico
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Navegando Mestrado em Engenharia Elétrica por Autor "1º membro da banca"

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    Identificação e monitoramento de dormentes de ferrovias usando processamento de imagens
    (Universidade Federal do Espírito Santo, 2017-05-29) Franca, André Stanzani; Vassallo, Raquel Frizera; 1º membro da banca
    The railway is an important engine of the world economy. This means of transport more than 200 years old is efficient, safe and of great capacity and speed but still suffers from the difficulties of maintenance, mainly due to its assets of great extent, quantity, weight and geographic dispersion. In view of this, some initiatives in automatic inspection of railway assets have been developing. In particular, the inspection of railway sleepers (railway ties), which is sometimes done manually, needs development and consolidation. This dissertation presents a method for inventorying, identifying the type and some defects in sleepers based on image processing, heuristics and feature fusion in an unsupervised way. It uses Haar transform and integral images, as well as other image processing techniques such as edge detection and entropy computation along with aspects of railroad topology to achieve the proposed objectives. The algorithm was developed using real images of daily railway, previously unclassified, and that were subject to various noises and variations of a real railway operation. The method was validated through experiments with an image set that have approximately 33,000 sleepers. The results are promising and reach 97% accuracy in identifying the type of sleepers and reach 93% accuracy in identifying visible defects in sleepers.
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    Reator eletrônico microcontrolado de alto fator de potência para lâmpadas de alta intensidade de descarga
    (Universidade Federal do Espírito Santo, 2005-11-24) Orletti, Renato; Có, Márcio Almeida; Vieira, José Luiz Freitas; 1º membro da banca
    This work presents an overview about the High intensity discharge (HID) Lamps, showing its operation, the lamps variety and the peculiarities of this drive. The drive with electromagnetic ballast and electronic ballast are studied to verify advantages and disadvantages. After the analysis of electromagnetic and electronic drives, an electronic ballast is proposed. A prototype was implemented to verify the ballast performance. The experimental results have proved the viability of the electronic ballast proposed, emphasizing the reduced number of components used to make the prototype.