Alancardek P. Araujo

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The presence of stiction in control valves often causes oscillations in control loops, with negative effects on quality and cost of goods. Step that follows diagnosis is to quantify this stiction, in order to decide about maintenance or to implement compensators that can improve control loop performance until next plant stop. The describing function method(More)
The presence of friction and other non-linearities is a cause of oscillations in control loops, with negative effects on quality and cost of goods. The method of describing function is traditionally used to predict the period and amplitude of cycles limit control loops. This method is used in this article for detection and quantification of nonlinearities,(More)
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