Modelagem de Funções de Transferência de Plantas Industriais em Malha Aberta e Fechada utilizando Algoritmos Genéticos

Abstract

In control systems, knowing the transfer function is of paramount importance for the calibration of industrial compensators (PID controllers) and to determine their behavior. There are several conventional techniques for determining such transfer functions, such as Smith, Sundaresan and Krishnaswamy and Nishikawa for first order systems, and Harriot and Smith for second order systems.

This work aimed to determine the transfer function in open mesh and closed mesh systems through the genetic algorithm and to compare the models with those obtained in conventional forms. For the development of the algorithm it was necessary to apply knowledge of automation and control (Laplace transform, Controllers, block diagram and linear systems modeling) using as platform Matlab \ textregistered mathematical software. The results were compared and presented better responses, when compared to those obtained by conventional methods, proving that the applied method reached expectations. Afterwards, the system was applied to determine the transfer function of a real plant and the results proved that it is a valid tool for real applications.