Dynamic analysis of the center position control and design of disturbance observers during annealing and pickling

Abstract

In this study, we propose a new center position controller (CPC) to control the center position error (CPE) of the steel strip during the annealing and pickling processes. The model of the nonlinear CPC system is described for two adjacent rolls and extended to multifeed rolls. We derive a linearized discrete state equation for the multi CPC and analyze its characteristics. A simulator of the CPC system that includes rollers, actuators, and plant data is developed to test the dynamics of the CPC. In addition, a disturbance observer with a low pass filter Q(s) is designed to minimize the effects of various disturbances. The order and time constant of the filter are selected in consideration of the order of the system and the response of the actuator. Results of the offline tests show that the CPE is greatly decreased by the proposed control technology.

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Acknowledgments

This research was supported by the Daegu University Research Grant, 2019.

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Correspondence to Cheol Jae Park.

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Cheol Jae Park received the B.S. and M.S. degrees in Mechanical Engineering from Pusan National University, Korea, respectively. He received the Ph.D. degree from Seoul National University, Korea. From 1994 to 2008, he was a Principal Researcher at the technical research laboratories of Pohang Iron & Steel Company (POSCO). He is currently a Professor at the School of Mechanical Engineering at Daegu University, Korea. His research interests include receding horizon control, robust control, process control, and system identification.

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Park, C.J. Dynamic analysis of the center position control and design of disturbance observers during annealing and pickling. J Mech Sci Technol 35, 739–746 (2021). https://doi.org/10.1007/s12206-021-0134-y

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Keywords

  • Center position control
  • Disturbance observer
  • Annealing and pickling process
  • Center position error
  • Feed roll
  • Dynamic analysis