Online Gain Tuning Method of Roll Force AGC in Hot Strip Mills by Using Fuzzy Logic

Young Kow LEE; Yu Jin JANG; Sang Woo KIM

doi:10.1093/ietfec/e90-a.6.1144

Online Gain Tuning Method of Roll Force AGC in Hot Strip Mills by Using Fuzzy Logic

Young Kow LEE, Yu Jin JANG, Sang Woo KIM

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Gains of a roll force AGC (Automatic Gain Controller) have been calculated at the first locked-on-time by FSU (Finishing-mill Set-Up model) in hot strip mills and usually these values are not adjusted during the operating time. Consequently, this conventional scheme cannot cope with the continuous variation of system parameters and circumstance, though the gains can be changed manually with the aid of experts to prevent a serious situation such as inferior mass production. Hence, partially uncontrolled variation still remains on delivery thickness. This paper discusses an effective online algorithm which can adjust the gains of the existing control system by considering the effect of time varying variables. This algorithm improves the performance of the system without additional cost and guarantees the stability of the conventional system. Specifically, this paper reveals the major factors that cause the variation of strip and explores the relationship between AGC gains and the effects of those factors through the analysis of thickness signal which occupy different frequency bands. The proposed tuning algorithm is based on the above relationship and realized through ANFIS (Adaptive-Neuro-based Fuzzy Interface System) which is a very useful method because its fuzzy logics reflect the experiences of professionals about the uncertainty and the nonlinearity of the system. The effectiveness of the algorithm is shown by several simulations which are carried out by using the field data of POSCO corporation (South Korea).

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E90-A No.6 pp.1144-1153

Publication Date: 2007/06/01

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Online ISSN: 1745-1337

DOI: 10.1093/ietfec/e90-a.6.1144

Type of Manuscript: PAPER

Category: Systems and Control

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Young Kow LEE, Yu Jin JANG, Sang Woo KIM, "Online Gain Tuning Method of Roll Force AGC in Hot Strip Mills by Using Fuzzy Logic" in IEICE TRANSACTIONS on Fundamentals, vol. E90-A, no. 6, pp. 1144-1153, June 2007, doi: 10.1093/ietfec/e90-a.6.1144.
Abstract: Gains of a roll force AGC (Automatic Gain Controller) have been calculated at the first locked-on-time by FSU (Finishing-mill Set-Up model) in hot strip mills and usually these values are not adjusted during the operating time. Consequently, this conventional scheme cannot cope with the continuous variation of system parameters and circumstance, though the gains can be changed manually with the aid of experts to prevent a serious situation such as inferior mass production. Hence, partially uncontrolled variation still remains on delivery thickness. This paper discusses an effective online algorithm which can adjust the gains of the existing control system by considering the effect of time varying variables. This algorithm improves the performance of the system without additional cost and guarantees the stability of the conventional system. Specifically, this paper reveals the major factors that cause the variation of strip and explores the relationship between AGC gains and the effects of those factors through the analysis of thickness signal which occupy different frequency bands. The proposed tuning algorithm is based on the above relationship and realized through ANFIS (Adaptive-Neuro-based Fuzzy Interface System) which is a very useful method because its fuzzy logics reflect the experiences of professionals about the uncertainty and the nonlinearity of the system. The effectiveness of the algorithm is shown by several simulations which are carried out by using the field data of POSCO corporation (South Korea).
URL: https://global.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e90-a.6.1144/_p

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@ARTICLE{e90-a_6_1144,
author={Young Kow LEE, Yu Jin JANG, Sang Woo KIM, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Online Gain Tuning Method of Roll Force AGC in Hot Strip Mills by Using Fuzzy Logic},
year={2007},
volume={E90-A},
number={6},
pages={1144-1153},
abstract={Gains of a roll force AGC (Automatic Gain Controller) have been calculated at the first locked-on-time by FSU (Finishing-mill Set-Up model) in hot strip mills and usually these values are not adjusted during the operating time. Consequently, this conventional scheme cannot cope with the continuous variation of system parameters and circumstance, though the gains can be changed manually with the aid of experts to prevent a serious situation such as inferior mass production. Hence, partially uncontrolled variation still remains on delivery thickness. This paper discusses an effective online algorithm which can adjust the gains of the existing control system by considering the effect of time varying variables. This algorithm improves the performance of the system without additional cost and guarantees the stability of the conventional system. Specifically, this paper reveals the major factors that cause the variation of strip and explores the relationship between AGC gains and the effects of those factors through the analysis of thickness signal which occupy different frequency bands. The proposed tuning algorithm is based on the above relationship and realized through ANFIS (Adaptive-Neuro-based Fuzzy Interface System) which is a very useful method because its fuzzy logics reflect the experiences of professionals about the uncertainty and the nonlinearity of the system. The effectiveness of the algorithm is shown by several simulations which are carried out by using the field data of POSCO corporation (South Korea).},
keywords={},
doi={10.1093/ietfec/e90-a.6.1144},
ISSN={1745-1337},
month={June},}

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TY - JOUR
TI - Online Gain Tuning Method of Roll Force AGC in Hot Strip Mills by Using Fuzzy Logic
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1144
EP - 1153
AU - Young Kow LEE
AU - Yu Jin JANG
AU - Sang Woo KIM
PY - 2007
DO - 10.1093/ietfec/e90-a.6.1144
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E90-A
IS - 6
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - June 2007
AB - Gains of a roll force AGC (Automatic Gain Controller) have been calculated at the first locked-on-time by FSU (Finishing-mill Set-Up model) in hot strip mills and usually these values are not adjusted during the operating time. Consequently, this conventional scheme cannot cope with the continuous variation of system parameters and circumstance, though the gains can be changed manually with the aid of experts to prevent a serious situation such as inferior mass production. Hence, partially uncontrolled variation still remains on delivery thickness. This paper discusses an effective online algorithm which can adjust the gains of the existing control system by considering the effect of time varying variables. This algorithm improves the performance of the system without additional cost and guarantees the stability of the conventional system. Specifically, this paper reveals the major factors that cause the variation of strip and explores the relationship between AGC gains and the effects of those factors through the analysis of thickness signal which occupy different frequency bands. The proposed tuning algorithm is based on the above relationship and realized through ANFIS (Adaptive-Neuro-based Fuzzy Interface System) which is a very useful method because its fuzzy logics reflect the experiences of professionals about the uncertainty and the nonlinearity of the system. The effectiveness of the algorithm is shown by several simulations which are carried out by using the field data of POSCO corporation (South Korea).
ER -