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Open AccessArticle

Parametric Robust Control of the Multivariable 2 × 2 Looper System in Steel Hot Rolling: A Comparison between Multivariable QFT and H

Posgrado en Ingeniería Eléctria, Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Ave. Universidad S/N, Cd. Universitaria, San Nicolás de los Garza NL, CP 66455, Mexico
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Metals 2019, 9(8), 839; https://doi.org/10.3390/met9080839
Received: 27 June 2019 / Revised: 23 July 2019 / Accepted: 24 July 2019 / Published: 29 July 2019
(This article belongs to the Special Issue Researches and Simulations in Steel Rolling)
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Abstract

Two robust mutlivariable controllers, H and a decentralized quantitative feedback theory (QFT), are designed in the frequency domain for the 2 × 2 looper system in a steel hot rolling mill to keep stability in the presence of parametric uncertainties. The H controller is designed by using the mixed sensitivity approach, while the multivariable decentralized QFT is designed by the extension of the sequential loop closing method presented elsewhere. Stability robustness conditions are verified in the frequency domain, while simulations in time domain are carried out to evaluate the controllers and compare their performance along with that of proportional + integral (PI) and single input single output (SISO) QFT controllers designed earlier. The QFT controller shows the best balance among the performance indicators analyzed here; however, at the expenses of using higher power in one of the control inputs. View Full-Text
Keywords: robust control; multivariable control; QFT; H; hot rolling; looper control; parametric uncertainties robust control; multivariable control; QFT; H; hot rolling; looper control; parametric uncertainties
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Cantú, L.F.; Mendiola, P.; Domínguez, Á.A.; Cavazos, A. Parametric Robust Control of the Multivariable 2 × 2 Looper System in Steel Hot Rolling: A Comparison between Multivariable QFT and H. Metals 2019, 9, 839.

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