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Master's Dissertation
DOI
10.11606/D.3.2008.tde-25092008-095551
Document
Author
Full name
Carlos Eduardo Gurgel Paiola
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Garcia, Claudio (President)
Cruz, José Jaime da
Gedraite, Rubens
Title in Portuguese
Técnicas intrusivas de detecção de atrito em válvulas de controle.
Keywords in Portuguese
Atrito
Controle de processos (variabilidade)
Sistemas de controle
Válvulas de controle pneumático
Abstract in Portuguese
A variabilidade é um problema presente na maioria das malhas de controle de processos industriais, trazendo prejuízo ao causar perda de produtividade e utilização excessiva de matéria prima e energia. Muitas vezes ela é causada pela presença do atrito em válvulas de controle, os atuadores mais usados em processos industriais. Há uma série de métodos propostos para diagnosticar as perturbações causadas pelo atrito nas válvulas, classificados em intrusivos e não-intrusivos. Neste trabalho, foram estudados dois métodos intrusivos. Eles foram aplicados de maneira automática em simulações computacionais, que foram realizadas em um sistema híbrido de teste (HIL) de uma planta de vazão, com dois níveis de atrito da válvula, e também em um ambiente inteiramente simulado, visando analisar o desempenho dos dois métodos. Os resultados obtidos com ambos os métodos foram satisfatórios, muito embora um dos métodos tenha confundido os efeitos gerados pelo atrito com os produzidos por má sintonia do controlador da malha.
Title in English
Intrusive methods of friction detection on control valves.
Keywords in English
Control valve
Diagnose
Friction
Stiction
Variability
Abstract in English
The variability is a problem present on the most of control loops in industrial processes. It causes losses in plant productivity and in material and energy usage. Many times it is caused by the presence of friction in control valves, the most used actuator in industrial processes. There are many methods proposed to diagnose the disturbances caused by control valve friction, which are classified in intrusive and non-intrusive. In this work, two intrusive methods are studied. They were applied automatically by computer simulations that were performed in a hybrid test system (HIL) of a flow plant, with two valve friction levels. Additionally they were applied in a completely simulated environment, aiming at analyzing the performance of both methods. The results with the two methods were satisfactory, although one of the methods has not separated the effects generated by the friction from the ones produced by a bad tuning of the loop controller.
 
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Publishing Date
2008-10-22
 
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