Metall. Res. Technol.
Volume 118, Number 2, 2021
|Number of page(s)||14|
|Published online||25 March 2021|
Dynamic modelling and linear quadratic sliding mode control of a multivariable looper system in hot strip mills
Institute of Manufacturing Engineering, HuaQiao University,
361021, PR China
2 Fujian Engineering Research Center of Intelligent Manufacturing for Brittle Materials, Fujian 361021, PR China
* e-mail: firstname.lastname@example.org
Accepted: 22 December 2020
This paper introduces a linear quadratic sliding mode control (LQ-SMC) scheme into a looper control system. First, according to a 1700 mm tandem hot mill, the state-space dynamic model of the looper system was established, and then, the optimal control law of the looper system was obtained based on the established model. Finally, the optimal sliding mode and optimal sliding mode control law of the LQ-SMC scheme were designed such that the sliding motion could satisfy the optimal value of the quadratic performance index. Simulation results show that the proposed control scheme has complete robustness to external disturbances that satisfies certain conditions, and the coupling between the looper angle dynamic and strip tension dynamic is also minimized.
Key words: dynamic modelling / linear quadratic sliding mode control / looper and tension control / hot strip finishing mill
© EDP Sciences, 2021
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