DOI: 10.52150/2522-9117-2023-37-340-348

Yegorov Oleksandr Petrovych, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0002-9867-0437. E-mail: o.p.egorov@ust.edu.ua

Rybalchenko Mariia Oleksandrivna, Ph. D. (Tech.), Associate Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0001-5162-5201. E-mail:  m.o.rybalchenko@ust.edu.ua

Manachyn Ivan Oleksandrovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-9795-6751. E-mail: ovoch-isi@outlook.com

ADAPTIVE CONTROL SYSTEM OF FREE ROLLING SPEED MODE WITH FUZZY CONTROLLER

Abstract. The best high-speed mode of rolling mills is the mode of free rolling with loop formation in finishing groups of cages. Stabilization of the loop is carried out by the control system of the rotation frequency of the rolls of rolling cages based on the information of the sensor of the position of the loop. The increase in the loop depends on the frequency of rotation of the rolls of adjacent cages and the coefficient of extraction of the rolled product in the cage following the adjustable gap. To set up the system, it is necessary to know the numerical characteristics of the influences that disturb and affect the size of the rolling loop. The change in the rotation frequency of the main drive of the cages during the stabilization of the size of the rolling loop in the intercellular gap of the cages of the finishing group of the continuous rolling condition was studied. The change in the rotation frequency of the rolls characterizes the total effects of the rolling mode on the size of the loop. Research have shown that in a non-stationary realization it is possible to single out a trend that is described by a completely deterministic dependence, and to conduct an analysis of a random stationary realization with respect to this trend. A structural diagram of the circuit for regulating the position of the rolling loop was developed. This scheme includes: an electric wire with a current loop, a speed loop, a speed regulator, a rolling loop, a loop position regulator, a compensator of disturbing influences. The compensator is based on the Fuzzy controller and produces a control effect depending on the inconsistency in the loop control circuit. In this way, the low-frequency disturbance component at the rolling speed, which can reach 10% of the rolling speed, is monitored and compensated. The obtained data of changes value of the loop without and with a compensating circuit. The size of the loop in the system without a compensating circuit when rolling a thicker rear part of the rolled product reaches the maximum permissible size. This does not happen in a system with a compensating circuit. It is possible to stabilize the value of the loop in a given range either by increasing the regulator coefficient, thereby worsening the dynamics of the entire multi-link control system of the high-speed rolling mode, or by using the proposed method of adaptive disturbance compensation.

Key words: free rolling, rolls, speed mode, loop, regulator, Fuzzy controller.

DOI: https://doi.org/10.52150/2522-9117-2023-37-340-348

For citation: Yegorov, O. P., Rybalchenko, M. O., & Manachyn, I. O. (2023). Adaptive control system of free rolling speed mode with fuzzy controller. Fundamental and applied problems of ferrous metallurgy, 37, 340-348. https://doi.org/10.52150/2522-9117-2023-37-340-348

References

1. Chekmarev, A. P. et al. (1967). Rolling on small-section mills. Metallurgy
2. Grudev, A. P. (1988). Theory of rolling. Textbook for universities. Metallurgy
3. Beshta, A. S., Kuvaev, V. N., Potap, O. E., & Yegorov, A. P. (2014). Automation of technological processes in small-section rolling mills: monograph. Zhurfond
4. Yegorov, A. P. (1981). Improving automatic control systems for multi-connected electric drives of a group of stands during rolling with loop control: dis. Ph.D. tech. Sciences. Dnepropetrovsk
5. Yegorov, O. P., Rybalchenko, M. O., & Manachyn, I. O. (2022). Digital methods for monitoring and designing regulators in automatic heating systems. Study guide. UDUNT
6. Yegorov, O. P., & Mikhailovsky, M. N. (2020). Design of control systems in the Fuzzy Logic Toolbox environment. Study guide.
7. Stakhno, V. I., Yegorov, A. P., & Klimenko, E. N. (1978). Loop size converter for continuous wire mills. Mechanization and automation of production, (1), 46-54