Detection and Diagnosis of Stiction in Control Loops: State by Mohieddine Jelali, Biao Huang PDF

By Mohieddine Jelali, Biao Huang

ISBN-10: 1848827741

ISBN-13: 9781848827745

The presence of non-linearities, equivalent to stiction and deadband, locations limits at the functionality of regulate valves. certainly, within the method industries, stiction is the commonest valve challenge, and over the past decade a number of diverse thoughts for overcoming it were proposed.

Detection and prognosis of Stiction up to speed Loops represents a complete presentation of those equipment, together with their ideas, assumptions, strengths and disadvantages. instructions and dealing methods are supplied for the implementation of every strategy and MATLAB®-based software program could be downloaded from www.ualberta.ca/~bhuang/stiction-book permitting readers to use the how to their very own info. tools for the drawback of stiction results are proposed in the basic context of:

• oscillation detection up to speed loops;

• stiction detection and prognosis; and

• stiction quantification and prognosis of a number of faults.

The state of the art algorithms offered during this publication are proven and in comparison in commercial case reports of various beginning – chemical substances, construction, mining, pulp and paper, mineral and steel processing. Industry-based engineers will locate the publication to be beneficial information in expanding the functionality in their keep an eye on loops whereas educational researchers and graduate scholars drawn to keep an eye on functionality and fault detection will find a wealth of static-friction-related learn and necessary algorithms.

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Extra info for Detection and Diagnosis of Stiction in Control Loops: State of the Art and Advanced Methods

Example text

Shah • Finally, the output is converted back to a mA signal using a look-up table based on characteristics of the valve such as linear, equal percentage or square root, and the new valve position is reported. 2 Dealing with Stochastic or Noisy Control Signals The two-parameter stiction model uses the sign function to detect the change of valve direction. In the case of a noisy signal, this may cause numerical problems in the simulation. In real life, a noisy control signal causes the valve unnecessary movements and rapid wear and tear.

5%: acceptable < 3%: acceptable ; > 3%: to be checked. 1%: desirable ; > 1%: to be checked. 3 Stiction Phenomenon and Related Effects There are some terms such as deadband, backlash and hysteresis, which are often misused and wrongly used in describing valve problems. For example, quite commonly a deadband in a valve is referred to as backlash or hysteresis. The following items review some definitions of terms related to stiction, to differentiate clearly between the key concepts that underline the ensuing discussion of friction in control valves.

Stiction (undershoot): if J < S, then the valve output can never reach the valve input. There is always some offset or deviation between the valve input and the valve output. This represents the undershoot case of stiction. – Stiction (no offset): if J = S, the algorithm produces pure stick-slip behaviour. There is no offset between the valve input and the valve output. Once the valve overcomes stiction, the valve output tracks or reaches the valve input exactly. This is the well-known stick-slip case.

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Detection and Diagnosis of Stiction in Control Loops: State of the Art and Advanced Methods by Mohieddine Jelali, Biao Huang


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