Compensação de atrito em válvulas de controle. / Friction compensation in control valves.

AUTOR(ES)

Carlos Guilherme Linkevicius Gury

DATA DE PUBLICAÇÃO

2008

RESUMO

Friction is a nonlinearity that generally produces bad performance of a mechanical system with moving parts. In this work, the studied mechanical element is the process control valve, which is the most used final control element in process industries. The presence of friction in control valves increases control loop variability, generating impact in all plant productive chain, due to the increase of energy consumption and rejection of end product that is out of specification. In such a way, we can see that the studies aiming variability reduction had started to have a great economic importance, due to its direct impact in business profitability. Many studies have been done aiming friction diagnosis, measurement and compensation. In this work, techniques that have been proposed on the literature for friction compensation in control valves are implemented. The conclusions obtained in the experiments are presented to evaluate the performance of the compensators and possible future implementations are proposed, following this research line.

ASSUNTO(S)

controle de processos (variabilidade) friction atrito válvulas de controle pneumático sistemas de controle compensator simulation control valve

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