Tail crash control in hot strip mill by LQR

Kiyota, Takanori; Matsumoto, Hiromi; Adachi, Y.; Kondo, Eiji; Tsuji, Yuichi; Aso, Shigeru

doi:10.1109/acc.2003.1243996

Cited by 9 publications

(10 citation statements)

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“…Okamura, & Hoshino (1997) applied state feedback control based on pole assignment. Kiyota et al (2003) focused on linear optimal regulator. Okada et al (2005) considered sliding mode control using a steering observer.…”

Section: Introductionmentioning

confidence: 99%

Active disturbance rejection control for strip steering control in hot strip finishing mill

2015

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Strip off-centering is a displacement of strip center from a roll center. The mathematical model is constructed based on strip dynamics, roll deformation and tension. It includes time-varying input delay and actuator dynamics. To reduce an off-center value of the strip, active disturbance rejection control algorithm is proposed. The simulation using a realtime simulator shows that the proposed algorithm is effective.

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Section: Introductionmentioning

confidence: 99%

Active disturbance rejection control for strip steering control in hot strip finishing mill

2015

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“…There have also been many mathematical studies of lateral motion in a single reduction stand [2][3][4][5][6][7][8][9] and some have included the effects of buckling of the strip D J Gates and T Tarnopolskaya [10][11][12]. The lateral motion in multi-roll models without reduction, having application to web handling, has been extensively studied [13,14]; these studies have components similar to (b) and (c) in the mill models.…”

Section: Introductionmentioning

confidence: 99%

Linear theory for lateral displacements of a metal strip in a tandem cold-rolling mill with asymmetries

Gates

Tarnopolskaya

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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Asymmetries in the state of a cold-rolling mill cause lateral displacements of the metal strip, which sometimes result in a major breakdown of the mill. Non-linear model equations, previously employed, are reduced to a linear form via a first-order expansion of the plastic reduction equations, appropriate for small displacements. The continuity equations, normally applied at the entry and exit of a stand, are replaced by simpler equations applied on the neutral line. These simplifications provide explicit formulae for equilibrium lateral displacements, which lead to more general conclusions. Moreover, these formulae do not involve the compliance and reaction of the mill, but relate the displacements to strip conditions and roll-gap asymmetries alone. A strong coupling between the stands and a strong upstream influence are demonstrated. The results agree with that of a non-linear model and with data from a laboratory mill. Increasing entry tension to the first stand, up to moderate levels, has the beneficial effect of reducing the size of the lateral displacements. However, the model predicts that abnormally high strip tension or low friction can lead to divergent displacements, which would crash the mill. The results offer the potential for better control and should be of interest to mill operators.

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“…Although a dynamic relation between strip and rolling system has been derived 1) and various modern control schemes [2][3][4][5] have been applied based on this model, most of the applications focused on reducing side-slipping for the finishing mill process. This focus was inevitable because the mathematical model describes the behavior of a finishing mill instead of that of actual roughing mill.…”

Section: Introductionmentioning

confidence: 99%

Camber Regulation in Rough Rolling Process Using Wedge Estimation of Incoming Bar

et al. 2015

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In this paper, a new algorithm to reduce camber based on an estimated entry-side wedge of the bar during rough rolling process is proposed. The entry-side wedge is estimated based on a simple mathematical model with the aids of the tangent vector variation and curvature, which can both be obtained using the measured bar centerline. The differential roll gap between drive-side and work-side was then adjusted to minimize the delivery-side curvature of the bar using this estimated entry-side wedge information. A three-dimensional simulator that describes a rough rolling process was constructed using FEM (Finite Element Method). The effectiveness of the proposed scheme was validated using FEM simulation combined with the proposed camber reducing algorithm.

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Tail crash control in hot strip mill by LQR

Cited by 9 publications

References 0 publications

Active disturbance rejection control for strip steering control in hot strip finishing mill

Active disturbance rejection control for strip steering control in hot strip finishing mill

Linear theory for lateral displacements of a metal strip in a tandem cold-rolling mill with asymmetries

Camber Regulation in Rough Rolling Process Using Wedge Estimation of Incoming Bar

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