PERIODIC DISTURBANCES REDUCTION IN THE CONTINUOUS CASTING PROCESS BY MEANS OF A MODIFIED SMITH PREDICTOR

Karim Jabri, Alain Mouchette, Bertrand Bèle, Emmanual Godoy, Didier Dumur

Abstract

In the continuous casting process, various control strategies are used to reduce the mold level fluctuations which cause surface defects in the final product. This paper proposes a control structure able to improve the reduction of the bulging effect on the mold level. It is based on the Aström’s modified Smith predictor scheme which presents the advantage that the setpoint response is decoupled from the disturbance rejection transfer function. control theory is utilized to develop the controller of this second loop. Both the disturbances rejection and the robust stabilization are considered in this design. Effective tuning rules are also given. Simulation results confirm that the proposed design is more effective than the one based on the PID control law currently implemented in several real plants.

References

  1. Kurokawa, T., Kato, Y., Kondo T., 1992. Development of CC mold level adaptive control system. Current Advances in Materials and Processes, 5(2):354.
  2. Matoba, Y., Yamamoto, T., Tozuda, M., Watanabe, T., Tomono, H., 1990. Instrumentation and control technology for supporting high-speed casting. In 9th PTD Process Technol. Conf. Proc.
  3. Jabri, K., Mouchette, A., Bèle, B., Godoy, E., Dumur, D., 2008a. Disturbances estimation for mold level control in the continuous casting process. In 5th International Conference on Informatics in Control, Automation and Robotics ICINCO, Funchal, Portugal.
  4. Yoon, U-S., Bang, I.-W., Rhee, J.H., Kim, S.-Y., Lee, J.- D., Oh, K.H., 2002. Analysis of mold level hunching by unsteady bulging during thin slab casting. ISIJ International, 42(10):1103-1111.
  5. Thomas, B.G., Bai, H., 2001. Tundish nozzle clogging - application of computational models. In 18rd PTD Conf. Proc., Baltimore (US).
  6. Lim, D.J., Jeong, H.S., Hong, D.H., 1990. A Study on the Mold Level Control of Continuous Casting System.
  7. Chen, Y.D., Tung, P.C., Fuh, C.C., 2007. Modified Smith predictor scheme for periodic disturbance reduction in linear delay systems. Journal of Process Control, 17:799-804.
  8. Aström, K.J., Hang, C.C., Lim, B.C., 1994. A new smith predictor for controlling a process with an integrator and long dead-time. IEEE Trans. on Automatic Control, 39(2):343-345.
  9. Guanghui, Z., Feng, Q., Huihe, S., 2007. Robust tuning method for modified Smith predictor. Journal of Systems Engineering and Electronics, 18(1):89-94.
  10. Zhang, F., Hosoe, S., Kouno, M., 1991. Synthesis of robust output regulators via H8 control. In 13th SICE Symp. Dynamical Syst. Theory.
  11. Glover, K. et al, 1988. State space formula for all stabilizing controllers that satisfy an H8 norm bound and relations to risk sensitivity. Systems and Control Letters, 11:167-172.
  12. Jabri, K., Mouchette, A., Bèle, B., Godoy, E., Dumur, D., 2008b. “Suppression of periodic disturbances in the continuous casting process”. In Proc. Multiconference on Systems and Control MSC, San Antonio (US).
Download


Paper Citation


in Harvard Style

Jabri K., Mouchette A., Bèle B., Godoy E. and Dumur D. (2009). PERIODIC DISTURBANCES REDUCTION IN THE CONTINUOUS CASTING PROCESS BY MEANS OF A MODIFIED SMITH PREDICTOR . In Proceedings of the 6th International Conference on Informatics in Control, Automation and Robotics - Volume 2: ICINCO, ISBN 978-989-674-001-6, pages 110-115. DOI: 10.5220/0002206901100115


in Bibtex Style

@conference{icinco09,
author={Karim Jabri and Alain Mouchette and Bertrand Bèle and Emmanual Godoy and Didier Dumur},
title={PERIODIC DISTURBANCES REDUCTION IN THE CONTINUOUS CASTING PROCESS BY MEANS OF A MODIFIED SMITH PREDICTOR},
booktitle={Proceedings of the 6th International Conference on Informatics in Control, Automation and Robotics - Volume 2: ICINCO,},
year={2009},
pages={110-115},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002206901100115},
isbn={978-989-674-001-6},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 6th International Conference on Informatics in Control, Automation and Robotics - Volume 2: ICINCO,
TI - PERIODIC DISTURBANCES REDUCTION IN THE CONTINUOUS CASTING PROCESS BY MEANS OF A MODIFIED SMITH PREDICTOR
SN - 978-989-674-001-6
AU - Jabri K.
AU - Mouchette A.
AU - Bèle B.
AU - Godoy E.
AU - Dumur D.
PY - 2009
SP - 110
EP - 115
DO - 10.5220/0002206901100115