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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

[en] AUTOMATION OF EXTENSOMETRIC DATA ACQUISITION AND ANALYSIS / [pt] AUTOMAÇÃO DA AQUISIÇÃO E ANÁLISE DE DADOS EXTENSOMÉTRICOS

LUCIANO GURGEL VALENTE 30 March 2012 (has links)
[pt] Sistemas de aquisição e visualização de dados multicanais vêm se impondo como a tendência nas aplicações que demandam a medição e análise de resultados de testes. Neste trabalho foi desenvolvido um sistema extensométrico automatizado, o qual através de testes reais no ambiente da engenharia mecânica pôde ser analisado em termos de performance, vantagens e desvantagens quando aplicado em três diferentes técnicas extensometricas (i) a tradicional, baseada na ponte de Wheatstone, (ii) a medição direta de resistência (ligação em 4 fios), e (iii) a medição de tensões residuais pelo método do furo cego. O sistema desenvolvido gerencia qualquer tarefa extensometrica, o qual através de telas com interface amigável, possibilita medições com relativa simplicidade e bastante eficiência. / [en] Multi-channel data acquisition and visualization systems have been the main option in applications that demand measuring and analyzing test results. In the present work, an extensometry-orientated automated system has been developed, and this system was tested througth real tests on the mechanical engineering environment and analyzed in terms of performance, advantages and disadvantages when applied in three different extensometric techniques (i) the traditional, with Wheatstone Bridge, (ii) Resistance Direct Measuring (4 wires connection), and (iii) Residual Stresses Measuring by the Blind Hotel Method. The developed system manages any extensometric task, and by using friendly interface screens, measuring can be accomplished with some simplicity and very musch efficiency.

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