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TECHNICAL PAPERS

A Multivariable and Multi-Objective Approach for the Control of Hot-Strip Mills

[+] Author and Article Information
Francesco A. Cuzzola

 Danieli Automation S.p.A., Via B. Stingher, 4, I-33042 Buttrio (UD) - Italyf.cuzzola@dca.it

J. Dyn. Sys., Meas., Control 128(4), 856-868 (Feb 14, 2006) (13 pages) doi:10.1115/1.2361323 History: Received May 08, 2004; Revised February 14, 2006

The control of a hot strip rolling mill is quite a complex problem due to the presence of many simultaneous control tasks. This is the main motivation that spurred the major steel corporations to adopt more sophisticated control techniques based on multi-variable concepts. The main drawback of most multi-variable approaches is the lack of transparency of the resulting controller that, consequently, can turn out hard to tune on site. In this paper we solve the tuning problem by adopting a multi-objective control approach that allows explicitly taking into account the existence of actuator limitations and nonlinear dynamics. Furthermore, the application of the proposed control technique to a narrow hot strip mill is here described.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 3

Compensation of a step disturbance acting on the hydraulic torque of the looper ΔMhyd by means of the conventional controller

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Figure 4

Compensation of a step disturbance acting on the hydraulic torque of the looper ΔMhyd by means of the multi-variable controller

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Figure 5

Compensation of a sinusoidal disturbance acting on the hydraulic torque of the looper ΔMhyd by means of the classical controller

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Figure 14

Command to the servovalve controlling the looper 4 with the conventional controller [−1,+1]

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Figure 13

Measure of the specific tension at the looper 4 with the conventional controller (whole record (a) steady state (b))

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Figure 12

Command to the servovalve controlling the looper 4 with the multi-variable controller [−1,+1]

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Figure 11

Measure of the specific tension at the looper 4 with the multi-variable controller (whole record (a) steady state (b))

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Figure 10

Compensation of a sinusoidal disturbance acting on the strip entry speed Vi+1 of the downstream stand by means of the multi-variable controller

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Figure 9

Compensation of a sinusoidal disturbance acting on the strip entry speed Vi+1 of the downstream stand by means of the classical controller

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Figure 8

Compensation of a step disturbance acting on the strip entry speed Vi+1 of the downstream stand by means of the multi-variable controller

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Figure 7

Compensation of a step disturbance acting on the strip entry speed Vi+1 of the downstream stand by means of the conventional controller

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Figure 6

Compensation of a sinusoidal disturbance acting on the hydraulic torque of the looper ΔMhyd by means of the multivariable controller

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Figure 2

Closed loop pole-placement sector

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Figure 1

Rolling stand and looper mechanism

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