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Advisor(s)
Abstract(s)
O controlo de sistemas de difusão de calor pode ser usualmente controlado por PID,
aplicando os diversos métodos existentes para este tipo de controlo. No entanto,
existem outras opções de controlo possíveis que podem apresentar melhores resulta dos, como a lógica difusa.
A lógica difusa pode ser definida como a lógica precisa da imprecisão e aproximação. Esta permite que informação qualitativa e imprecisa, seja apresentada de
forma quantitativa. Com esta capacidade, é possível aplicar uma resolução prática
e rigorosa com a manipulação qualitativa de informação, inicialmente expressa de
forma linguística.
Com o objetivo de verificar se a lógica difusa tem um melhor desempenho, no
controlo de um sistema de difusão de calor, do que o controlo PID clássico, é efetuado um estudo de conceitos inerentes à lógica difusa e aos métodos de controlo
convencionais.
Utilizando um sistema eletrónico de regulação térmica, inicialmente fazendo uma
introdução da sua resposta à variação de temperatura, são aplicados vários métodos
de controlo. Recorrendo ao MATLAB, são aplicados algoritmos para controlo PID
e por lógica difusa, bem como a aquisição e a análise desses dados.
Com a apresentação dos resultados das experiências práticas realizadas, aplicando diversos métodos e parâmetros, é selecionado o método com melhor resposta
temporal de cada opção de controlo, sendo apresentada a sua comparação e tecidas
as correspondentes conclusões.
The control of heat diffusion systems can usually be controlled by PID, applying the several methods existing for this type of control. However, there are other possible control options that may present better results, such as fuzzy logic. Fuzzy logic can be defined as the precise logic of imprecision and approximation. It allows qualitative and imprecise information to be presented in a quantitative way. With this capability, it is possible to apply a practical and rigorous resolution with the manipulation of qualitative information, initially expressed in a linguistic way. With the objective of verifying whether fuzzy logic has a better performance, in the control of a heat diffusion system, than PID control, a study of concepts inherent to fuzzy logic and conventional control methods is carried out. Using an electronic thermal regulation system, initially making an introduction of its response to temperature variation, several control methods are applied. With MATLAB, algorithms for PID control and fuzzy logic control are applied, as well as the acquisition and analysis of these data. With the presentation of the results of the practical experiments carried out, applying various methods and parameters, the method with the best temporal re sponse of each control option is selected, and its comparison and conclusions are presented.
The control of heat diffusion systems can usually be controlled by PID, applying the several methods existing for this type of control. However, there are other possible control options that may present better results, such as fuzzy logic. Fuzzy logic can be defined as the precise logic of imprecision and approximation. It allows qualitative and imprecise information to be presented in a quantitative way. With this capability, it is possible to apply a practical and rigorous resolution with the manipulation of qualitative information, initially expressed in a linguistic way. With the objective of verifying whether fuzzy logic has a better performance, in the control of a heat diffusion system, than PID control, a study of concepts inherent to fuzzy logic and conventional control methods is carried out. Using an electronic thermal regulation system, initially making an introduction of its response to temperature variation, several control methods are applied. With MATLAB, algorithms for PID control and fuzzy logic control are applied, as well as the acquisition and analysis of these data. With the presentation of the results of the practical experiments carried out, applying various methods and parameters, the method with the best temporal re sponse of each control option is selected, and its comparison and conclusions are presented.
Description
Keywords
Lógica Difusa Controlo PID Sistema Térmico Resposta térmica ao controlo MATLAB