Suppression of periodic disturbances in the continuous casting process

Jabri, Karim; Bèle, Bertrand; Mouchette, Alain; Dumur, Didier; Godoy, E.

doi:10.1109/cca.2008.4629617

Cited by 10 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result can be obtained by adopting the following controller realization: (7) which is the convex combination of the previously determined slow and fast realizations , according to the time-varying combination parameter . As will be shown next, different criteria can be adopted to make vary in such a way that the number of abrupt jumps is considerably reduced and, at the same time, the advantages related to the use of two controllers with different bandwidths are largely retained.…”

Section: Switching Controller Realizationmentioning

confidence: 99%

“…The last factor induces a low-frequency periodic disturbance whose effect can be drastically reduced by the adoption of split strandguide rollers of small diameter and short pitch [3], [4]. Anyway, since its frequency, strictly related to the casting speed, is approximately known [5], this low-frequency disturbance can efficiently be rejected by means of a feedforward disturbance compensation channel or by an additional internal model closed-loop compensator [6], [7]. Therefore, this paper focuses on the other kinds of perturbations, with particular regard to the sudden drops into the mold of material deposited on the internal surface of the nozzle connecting the tundish with the mold.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Switching Policies for Mold Level Control in Continuous Casting Plants

Krajewski

Miani

Morassutti

et al. 2011

IEEE Trans. Contr. Syst. Technol.

View full text Add to dashboard Cite

The problem of controlling the liquid level in the mold of a continuous casting process is considered. Essentially, the system operates in two different modes: (a) one in which the system is affected only by small-amplitude high-frequency disturbances, and (b) one in which the system is affected by a comparatively large disturbance related to an abrupt unclogging phenomenon. To cope with the first situation, the control system must exhibit a narrow bandwidth, whereas the second situation requires a much larger bandwidth. The two conflicting requirements lead naturally to the design of two distinct controllers and a switching rule that activates either controller according to the operating condition. Due to the time-varying nature of the resulting control system, the controllers should be properly realized to guarantee stability; to this purpose, a recent result on switching systems [15] is invoked. Since the sudden switching between controllers can cause controller and actuator output bumps, a soft switching policy that still ensures stability is also proposed. Simulations and laboratory experiments carried out on an electronic analogue of the process show the effectiveness of the suggested control schemes.

show abstract

Section: Switching Controller Realizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Switching Policies for Mold Level Control in Continuous Casting Plants

Krajewski

Miani

Morassutti

et al. 2011

IEEE Trans. Contr. Syst. Technol.

View full text Add to dashboard Cite

show abstract

Ideal Stopper Rod Lifts for Various Casting Conditions

Shivaram¹

2013

Pricm

View full text Add to dashboard Cite

Mathematical formulations to determine the flow controlling gap between a stopper rod and submerged entry nozzle are presented along with derivations. Expressions are also presented for the ideal stopper rod lift in terms of casting conditions and height of liquid metal in the tundish in order to maintain a constant mold level. Calculations using these formulations for a few example configurations are presented. These formulations could be used to determine the potential for flow rate control with a particular stopper rod as well as to make design improvements to increase this control. A possibility of using these calculations to estimate the extent of buildup on the stopper rod or orifice regions is also introduced.

show abstract

The consistency control of mold level in casting process

Shen

2017

Control Engineering Practice

View full text Add to dashboard Cite

Suppression of periodic disturbances in the continuous casting process

Cited by 10 publications

References 6 publications

Switching Policies for Mold Level Control in Continuous Casting Plants

Switching Policies for Mold Level Control in Continuous Casting Plants

Ideal Stopper Rod Lifts for Various Casting Conditions

The consistency control of mold level in casting process

Contact Info

Product

Resources

About