Controller design for hot strip finishing mills

Hesketh, T.; Jiang, Yu; Clements, D.J.; Butler, DA; Laan, Roald van der

doi:10.1109/87.664188

Cited by 52 publications

(29 citation statements)

References 7 publications

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“…권취공정 이전의 ROT (Run-Out Table) 공정에서 냉각제어를 통하여 압연판 의 재질과 장력 등의 통판성을 제어하려는 연구도 많이 진 행되고 있다 [10,11]. 그리고 출력 피드백으로 롤 속도를 제 어하여 속도 차이로부터 장력을 연산하고 장력편차를 제어 하기 위한 연구도 있다 [12,13]. 권취형상 제어 알고리즘 뿐 아니라 압연판의 쏠림현상을 측정할 수 있는 계측기술에 대한 연구도 수행되고 있다 [14].…”

Section: 웻지(Wedge)나 비대칭 압연에 의하여 압연판이 직진하지 않 고 좌우방향으로 쏠리는 현상을 분석하여 제어하unclassified

Design of LTBC Controller for Tension Control in Down Coiler Process of Hot Strip Mills

Lee¹,

Park²,

Park³

2015

Journal of Institute of Control, Robotics and Systems

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Abstract:In this paper, we propose an LTBC (Low Tension and Load Balance Control) scheme to improve a coiling shape control by reduction the tension fluctuation by the torque disturbance in the down coiler process of hot strip mills. The proposed controller is a combination of an LTC to control the overload at load-on in the mandrel and an LBC to regulate the load balance of the upper and bottom pinch roll. A tension calculation model is suggested with the concept of the tension deviation. The effectiveness of the proposed control scheme is verified from simulation under a disturbance of the pinch roll torque. Using a field test, we show that the performance of the shape and tension control is improved by the LTBC control.Keywords: down coiler process, hot strip mills, torque control, tension control, low tension control, load balance control, coiling shape control, pinch roll, telescope, run out table

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Section: 웻지(Wedge)나 비대칭 압연에 의하여 압연판이 직진하지 않 고 좌우방향으로 쏠리는 현상을 분석하여 제어하unclassified

Design of LTBC Controller for Tension Control in Down Coiler Process of Hot Strip Mills

Lee¹,

Park²,

Park³

2015

Journal of Institute of Control, Robotics and Systems

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“…................. (6) where A, B, C are chosen to achieve the good approximated model from the analytic FEM based WPM and used the Levenberg-Marquardt algorithm 17) to provide a numerical solution to the mathematical problem of minimizing a sum of squares of the errors. Since two parameters (r, ld/W) The comparison between the proposed model without tension and the analytic FEM based WPM is shown in Fig.…”

Section: Model Without Tensionmentioning

confidence: 99%

“…2) Since the interaction between the looper angle and the tension exists in the conventional looper control system, Okada 3) and Seki 4) proposed a decoupling model, to which an optimal multivariable controller is applied. Imanari 5) and Hesketh 6) proposed the H ϱ control and the backstepping scheme, respectively. Moreover decentralized and impedance controllers based on the internal mode control (IMC) structure were introduced by Asano.…”

Section: Introductionmentioning

confidence: 99%

Direct Width Control Systems Based on Width Prediction Models in Hot Strip Mill

et al. 2007

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In this paper, a width control system is proposed to obtain the desirable width margin of a strip in the rolling process of the hot strip mill. A simplified FEM (Finite Element Method) based width prediction model (WPM) is developed to compute the width spread at each stand. A neural network based error correction model (ECM) is also introduced to compensate for modelling errors from the simplified FEM based WPM. Input variables for the neural network model are chosen by using the hypothesis testing. In addition, the width control scheme using the simplified FEM based WPM and the neural network based ECM is proposed to achieve the desired width margin in the finishing mill. It is shown through the field test of the Pohang no. 1 hot strip mill of POSCO that the performance with respect to the width margin is greatly improved by the proposed width control scheme based on two models.

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“…To improve the performance of tension control, many advanced control algorithms have adapted the two-input and two-output multi-variable system model which uses the tension feedback. [2][3][4][5][6][7][8] Such control schemes, however, inevitably bring about complicated controllers, which are not intuitive and are hard to tune on site. In order to simplify the system, Kotera and Watanabe 2) introduced the interaction decoupling technique using the cross controller.…”

Section: Introductionmentioning

confidence: 99%

Non-interactive Looper and Strip Tension Control for Hot Finishing Mill Using Nonlinear Disturbance Observer

2012

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In this paper, we propose a non-interactive looper and strip tension control method for a hot finishing mill based on the nonlinear dynamic model. Using the NDOB (nonlinear disturbance observer), the nonlinear looper-tension dynamic system is decoupled into two independent SISO (single-input, single-output) subsystems, and moreover, the model uncertainties and the external disturbances generated from forward slip, strip thickness variation and outgoing strip speed are compensated. A modified TSM (terminal sliding mode) controller is utilized to control the looper angle while the output-feedback controller regulates the strip tension by adjusting the incoming roll speed. Hardware experiment with the 2-stand hardware looper simulator was performed to verify the effectiveness of the proposed approach.KEY WORDS: hot finishing mill; looper tension control; nonlinear disturbance observer; non-interactive control.

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Controller design for hot strip finishing mills

Cited by 52 publications

References 7 publications

Design of LTBC Controller for Tension Control in Down Coiler Process of Hot Strip Mills

Design of LTBC Controller for Tension Control in Down Coiler Process of Hot Strip Mills

Direct Width Control Systems Based on Width Prediction Models in Hot Strip Mill

Non-interactive Looper and Strip Tension Control for Hot Finishing Mill Using Nonlinear Disturbance Observer

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