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Journal of Vibration and Acoustics | Volume 139 | Issue 6 | research-article
Research Papers

Hopf Bifurcation Control for Rolling Mill Multiple-Mode-Coupling Vibration Under Nonlinear Friction

[+] Author and Article Information
Lingqiang Zeng

School of Mechanical Engineering,
University of Science and Technology Beijing,
Beijing 100083, China
e-mail: zeng_l_q@163.com

Yong Zang

School of Mechanical Engineering,
University of Science and Technology Beijing,
Beijing 100083, China
e-mail: yzang@ustb.edu.cn

Zhiying Gao

School of Mechanical Engineering,
University of Science and Technology Beijing,
Beijing 100083, China
e-mail: gaozhiying@me.ustb.edu.cn

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received June 6, 2016; final manuscript received June 1, 2017; published online August 17, 2017. Assoc. Editor: Izhak Bucher.

J. Vib. Acoust 139(6), 061015 (Aug 17, 2017) (13 pages) Paper No: VIB-16-1286; doi: 10.1115/1.4037138 History: Received June 06, 2016; Revised June 01, 2017
Article
References
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Rolling mill system may lose its stability due to the change of lubrication conditions. Based on the rolling mill vertical–torsional–horizontal coupled dynamic model with nonlinear friction considered, the system stability domain is analyzed by Hopf bifurcation algebraic criterion. Subsequently, the Hopf bifurcation types at different bifurcation points are judged. In order to restrain the instability oscillation induced by the system Hopf bifurcation, a linear and nonlinear feedback controller is constructed, in which the uncoiling speed of the uncoiler is selected as the control variable, and variations of tensions at entry and exit as well as system vibration responses are chosen as feedback variables. On this basis, the linear control of the controller is studied using the Hopf bifurcation algebraic criterion. And the nonlinear control of the controller is studied according to the center manifold theorem and the normal form theory. The results show that the system stability domain can be expanded by reducing the linear gain coefficient. Through choosing an appropriate nonlinear gain coefficient, the occurring of the system subcritical bifurcation can be suppressed. And system vibration amplitudes reduce as the increase of the nonlinear gain coefficient. Therefore, introducing the linear and nonlinear feedback controller into the system can improve system dynamic characteristics significantly. The production efficiency and the product quality can be guaranteed as well.
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References

Figures

Grahic Jump Location
Fig. 1

Schematic of coupling between structure model and rolling process model

+Schematic of coupling between structure model and rolling process model
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Schematic of coupling between structure model and rolling process model
Grahic Jump Location
Fig. 2

Simplified vertical–torsional–horizontal coupling structural model

+Simplified vertical–torsional–horizontal coupling structural model
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Simplified vertical–torsional–horizontal coupling structural model
Grahic Jump Location
Fig. 3

Geometry of the roll gap during vibration

+Geometry of the roll gap during vibration
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Geometry of the roll gap during vibration
Grahic Jump Location
Fig. 4

The trend of Hopf bifurcation parameter b* with steady rolling speed vrs

+The trend of Hopf bifurcation parameter b* with steady rolling speed vrs
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The trend of Hopf bifurcation parameter b* with steady rolling speed vrs
Grahic Jump Location
Fig. 5

Dynamic response and phase diagram of the system for vrs = 6 m s−1 and b = 2.27

+Dynamic response and phase diagram of the system for vrs = 6 m s−1 and b = 2.27
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Dynamic response and phase diagram of the system for vrs = 6 m s−1 and b = 2.27
Grahic Jump Location
Fig. 6

Dynamic response and phase diagram of the system for vrs = 18 m s−1 and b = 0.82

+Dynamic response and phase diagram of the system for vrs = 18 m s−1 and b = 0.82
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Dynamic response and phase diagram of the system for vrs = 18 m s−1 and b = 0.82
Grahic Jump Location
Fig. 7

Dynamic response and phase diagram of the system for vrs = 20.6945 m s−1 and b = 0.2885

+Dynamic response and phase diagram of the system for vrs = 20.6945 m s−1 and b = 0.2885
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Dynamic response and phase diagram of the system for vrs = 20.6945 m s−1 and b = 0.2885
Grahic Jump Location
Fig. 8

Influence of linear gain coefficient Kc on system Hopf bifurcation curve

+Influence of linear gain coefficient Kc on system Hopf bifurcation curve
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Influence of linear gain coefficient Kc on system Hopf bifurcation curve
Grahic Jump Location
Fig. 9

Dynamic responses of the controlled system at point B under different values of Kc: (a) Kc = −0.25, (b) Kc = 0, and (c) Kc = 0.25

+Dynamic responses of the controlled system at point B under different values of Kc: (a) Kc = −0.25, (b) Kc = 0, and (c) Kc = 0.25
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Dynamic responses of the controlled system at point B under different values of Kc: (a) Kc = −0.25, (b) Kc = 0, and (c) Kc = 0.25
Grahic Jump Location
Fig. 10

Three-dimensional phase diagrams of the controlled system at point A+ under different values of Kn: (a) Kn < −3.8348 × 10−2 and (b) Kn > −3.8348 × 10−2

+Three-dimensional phase diagrams of the controlled system at point A+ under different values of Kn: (a) Kn < −3.8348 × 10−2 and (b) Kn > −3.8348 × 10−2
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Three-dimensional phase diagrams of the controlled system at point A+ under different values of Kn: (a) Kn < −3.8348 × 10−2 and (b) Kn > −3.8348 × 10−2
Grahic Jump Location
Fig. 11

Three-dimensional phase diagrams of the controlled system at point B+ under different values of Kn: (a) Kn < −2.8313 × 10−3 and (b) Kn > −2.8313 × 10−3

+Three-dimensional phase diagrams of the controlled system at point B+ under different values of Kn: (a) Kn < −2.8313 × 10−3 and (b) Kn > −2.8313 × 10−3
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Three-dimensional phase diagrams of the controlled system at point B+ under different values of Kn: (a) Kn < −2.8313 × 10−3 and (b) Kn > −2.8313 × 10−3
Grahic Jump Location
Fig. 12

Three-dimensional phase diagrams of the controlled system at point C+ under different values of Kn: (a) Kn < 1.3350 × 10−6 and (b) Kn > 1.3350 × 10−6

+Three-dimensional phase diagrams of the controlled system at point C+ under different values of Kn: (a) Kn < 1.3350 × 10−6 and (b) Kn > 1.3350 × 10−6
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Three-dimensional phase diagrams of the controlled system at point C+ under different values of Kn: (a) Kn < 1.3350 × 10−6 and (b) Kn > 1.3350 × 10−6

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