Coating deviation control in transverse direction for a continuous galvanizing line

Author

Yoo, S.R. ; Choi, I.S. ; Nam, P.K. ; Kim, J.K. ; Kim, S.J. ; Davene, J.

Author_Institution

Labs. of Tech. Res., POSCO, Pohang, South Korea

Volume

7

Issue

1

fYear

1999

fDate

1/1/1999 12:00:00 AM

Firstpage

129

Lastpage

135

Abstract

A new air knife system for control of coating thickness was developed for a hot dip galvanizing line. The existing air knife system can manipulate only the mean coating weight. The developed new air knife system has the flexible nozzle structure, by which the transverse coating weight can be controlled. The controller is a multiinput-multioutput (MIMO) system which consists of m control inputs (measured value) and n control outputs (nozzle control). Multinozzle control is based on the optimal control algorithm. The controller calculates the m nozzle references according to the n coating weight deviations using optimal algorithm and the models between the coating weight and nozzle gap. The time delay problem was solved by the Smith predictor

Keywords

MIMO systems; delays; multivariable control systems; nozzles; optimal control; predictive control; steel industry; surface treatment; thickness control; MIMO system; air knife system; coating deviation control; coating thickness control; continuous galvanizing line; flexible nozzle structure; hot dip galvanizing line; mean coating weight; multinozzle control; nozzle control; optimal control; transverse coating weight control; transverse direction; Actuators; Coatings; Control systems; Delay effects; Furnaces; Galvanizing; Optimal control; Strips; Weight control; Zinc;

fLanguage

English

Journal_Title

Control Systems Technology, IEEE Transactions on

Publisher

ieee

ISSN

1063-6536

Type

jour

DOI

10.1109/87.736768

Filename

736768