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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

Proposta de tecnologia para controle de velocidade de PIGs instrumentados utilizando l?gica Fuzzy

Lima, Gustavo Fernandes de 16 December 2014 (has links)
Submitted by clediane guedes (clediane@bczm.ufrn.br) on 2017-11-17T14:53:50Z No. of bitstreams: 1 GustavoFernandesDeLima_DISSERT.pdf: 6636529 bytes, checksum: 7ae6c1c9fd14e9ad0f0a9829cbfe552f (MD5) / Approved for entry into archive by clediane guedes (clediane@bczm.ufrn.br) on 2017-11-17T15:10:34Z (GMT) No. of bitstreams: 1 GustavoFernandesDeLima_DISSERT.pdf: 6636529 bytes, checksum: 7ae6c1c9fd14e9ad0f0a9829cbfe552f (MD5) / Made available in DSpace on 2017-11-17T15:10:35Z (GMT). No. of bitstreams: 1 GustavoFernandesDeLima_DISSERT.pdf: 6636529 bytes, checksum: 7ae6c1c9fd14e9ad0f0a9829cbfe552f (MD5) Previous issue date: 2014-12-16 / O controle de velocidade de PIGs instrumentados ? necess?rio, dentro da ind?stria de petr?leo e g?s, para permitir uma inspe??o de dutos de melhor qualidade e maior seguran?a. Isto s? ? poss?vel quando esses PIGs mant?m uma velocidade baixa durante a opera??o de inspe??o de dutos, na procura de defeitos como corros?o, trincas e amassamentos. Este trabalho tem por objetivo propor uma tecnologia para o controle de velocidade de PIGs instrumentados utilizando uma v?lvula by-pass acionada por uma solenoide. Essa v?lvula tem a capacidade de controlar o diferencial de press?o atuante no corpo do PIG. E controlar o diferencial de press?o significa controlar a velocidade desse PIG. Uma bancada de testes foi montada em escala reduzida para simula??o de situa??es de ?tiro? e de acelera??o sofridos pelos PIGs. A bancada permitiu estudar as rea??es das press?es a montante e a jusante da v?lvula by-pass. A l?gica Fuzzy foi utilizada para determinar os tempos de abertura e fechamento dessa v?lvula, com objetivo de controlar o diferencial de press?o. Os testes na bancada mostraram uma redu??o substancial no valor do diferencial de press?o atuante no PIG ap?s a ocorr?ncia do ?tiro?. Tamb?m ocorreu uma redu??o no tempo em que o diferencial de press?o vai ao m?ximo e retorna ao valor de refer?ncia predefinido. Os resultados obtidos permitem concluir que ? poss?vel controlar o diferencial de press?o atuante no PIG, assim tamb?m a velocidade, utilizando a l?gica Fuzzy, atuando na abertura e fechamento da v?lvula by-pass proposta. / The speed control of smart PIGs is necessary, in oil and gas industry, for allow a better and safer pipeline inspection. This is possible when those smart it PIGs maintain a low speed while performs a pipeline inspection, in the search for defects as corrosion, cracks and dents. Our objective propose a technology for speed control of smart pigs using a by-pass valve triggered by a solenoid. This valve is able to control the pressure differential applied in PIG ?s body. Once we control the pressure differential, it is possible to control the speed of this PIG . A experimental benchmark was mounted in reduced scale for simulation of the PIG speed excursion situation and acceleration suffered by the PIGs . The experimental benchmark allowed to studying the reactions of the upstream and downstream pressure over the by-pass valve.The Fuzzy logic was used for determine the opening and closing period this valve to control pressure differential. The experimental tests show substantial reduction in pressure differential value over PIG after happening speed excursion. Also, the time necessary for the pressure differential go to maximum and returns to default reference value. The results obtained allow conclude which is possible to controlling pressure differential applied in PIG , thus also the speed, using Fuzzy logic, acting opening and closing period of proposed by-pass valve

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