(Universidade Federal do Rio Grande do Norte, 2015-12-17) Almeida, Tiago Alves de; Dorea, Carlos Eduardo Trabuco; ; http://lattes.cnpq.br/0143490577842914; ; http://lattes.cnpq.br/8624010204964992; Araújo, Fábio Meneghetti Ugulino de; ; http://lattes.cnpq.br/5473196176458886; Oliveira, Luiz Affonso Henderson Guedes de; ; http://lattes.cnpq.br/7987212907837941; Moreira, Vicente Delgado; ; http://lattes.cnpq.br/4549279470957332
In control loops valve stiction is a very common problem. Generally, it is one of main
causes of poor performance of industrial systems. Its most commonly observed effect is
oscillation in the process variables. To circumvent the undesirable effects, friction compensators
have been proposed in order to reduce the variability in the output. This work
analyzes the friction compensation in pneumatic control valves by using feedback linearization
technique. The valve model includes both dead zone and jump. Simulations show
that the use of this more complete model results in controllers with superior performance.
The method is also compared through simulations with the method known as Constant
Reinforcement (CR), widely used in this problem.
