Self-tuning control of a chip refiner motor load

On a chip refiner the gain of the transfer function between the refiner motor load and the plate gap is subject to a slow drift due to plate wear and to sudden changes in sign due to collapse of the pulp pad. A self-tuning regulator was designed to control motor load by manipulating the plate gap. I...

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Bibliographic Details
Published inAutomatica (Oxford) Vol. 18; no. 3; pp. 307 - 314
Main Author Dumont, Guy A.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.1982
Subjects
Adaptive control
controllers
digital control
identification
least squares estimation
motors
paper industry
power control
pulp industry
self-adjusting systems
stochastic control
time-varying systems
wear
wood processing
time-varying systems
identification
digital control
pulp industry
self-adjusting systems
power control
Adaptive control
stochastic control
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ISSN0005-1098
1873-2836
DOI10.1016/0005-1098(82)90090-5

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Summary:On a chip refiner the gain of the transfer function between the refiner motor load and the plate gap is subject to a slow drift due to plate wear and to sudden changes in sign due to collapse of the pulp pad. A self-tuning regulator was designed to control motor load by manipulating the plate gap. It uses a recursive least-squares estimator with a variable forgetting factor in conjunction with a Dahlin regulator. Results of plant trials on an industrial thermomechanical pulp production unit show that this regulator is capable of tracking the slow gain drift and of taking proper action in case a pulp pad collapse occurs.
Bibliography:ObjectType-Article-2
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ISSN:0005-1098
1873-2836
DOI:10.1016/0005-1098(82)90090-5