Mechanism analysis of non-sinusoidal oscillation of continuous casting mold synchronously driven by double servomotors

Zhou, Chao; Zhang, Xingzhong; Wang, Fang; Pingfei, Liu; Fang, Yiming

doi:10.1016/s1006-706x(17)30037-7

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…Zhuang MA, 1,2) Yiming FANG, 1,3) *Jianxiong LI, 1) Le LIU 1) and Qiang LI 1) and non-sinusoidal vibration modes are widely used in the field of continuous casting. More importantly, non-sinusoidal mode [9][10][11][12] can effectively improve casting speed and slab quality. In 8), a feedforward control algorithm was proposed to achieve precise control for sinusoidal and non-sinusoidal vibration mode.…”

Section: Displacement Tracking Control For Continuous Casting Mold Drmentioning

confidence: 99%

“…In 8), a feedforward control algorithm was proposed to achieve precise control for sinusoidal and non-sinusoidal vibration mode. In [9][10][11], mold synchro control model was established, and then the frequency, amplitude and other parameters were optimized under the non-sinusoidal mode, and they have different driving mechanisms. In 8) and 12), tracking control method was designed, and the effectiveness was verified for tracking control of non-sinusoidal curve and reducing steel breakout.…”

Section: Displacement Tracking Control For Continuous Casting Mold Drmentioning

confidence: 99%

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Displacement Tracking Control for Continuous Casting Mold Driven by Servo Motor Based on Composite Control Strategy

Fang

et al. 2020

ISIJ Int.

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This paper is concerned for tracking control of displacement control system of continuous casting mold (CCM) driven by servo motor with time-varying load disturbance and parameter perturbation. To improve tracking performance of CCM system, a nonlinear tracking controller based on feedforward and feedback control strategy is presented. Firstly, the system model is established by analyzing the non-sinusoidal vibration device. Then, an extended state observer (ESO) based on fractional power function (FPF) is introduced to estimate the disturbances of the system, which mainly include the parameter uncertainties and time-varying load torque. Subsequently, a composite controller, which includes a feedforward controller based on ESO and a feedback controller based on sliding mode control (SMC), is derived for addressing the tracking issues. Finally, numerical results show that the proposed control strategy is more effective than a feedback controller based on SMC.

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Section: Displacement Tracking Control For Continuous Casting Mold Drmentioning

confidence: 99%

Section: Displacement Tracking Control For Continuous Casting Mold Drmentioning

confidence: 99%

Displacement Tracking Control for Continuous Casting Mold Driven by Servo Motor Based on Composite Control Strategy

Fang

et al. 2020

ISIJ Int.

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“…e velocity rules of mold oscillation went through rectangular, trapezoid, sinusoidal, and nonsinusoidal oscillation. With the demand growing for the surface quality and casting speed of slab, nonsinusoidal oscillation has been one of the key technologies to realize highly efficient continuous casting [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Construction of Nonsinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold

et al. 2020

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Nonsinusoidal oscillation techniques can shorten the negative strip time and improve the slab surface quality in the process of steel continuous casting. But the acceleration of nonsinusoidal oscillation is higher than that of the sinusoidal oscillation. So it is easy to result in the impact for the mold movement. To solve this problem, a nonsinusoidal oscillation waveform function of mold was constructed, which had good dynamic characteristics. And the smaller acceleration can reduce the impact of the oscillator. By analyzing the parameters of oscillation technology, the calculation method of each oscillation technological parameter for seven section functions was presented and the multitechnological parameter curves were given. Based on the technological parameters of sinusoidal oscillation, a synchronous control model of nonsinusoidal oscillation was determined. The results show that the parameters can satisfy the limit value in theory, which can enhance the casting speed, surface quality of slab, and provide reference for further practice in industry.

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“…Nonsinusoidal vibration of continuous casting mold is one of the key technologies to develop efficient continuous casting [1,2]. It is a new drive mode that servo motor, rotated in single direction with variable speed, drives continuous casting mold vibrated in nonsinusoidal waveform [3].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Compound Control for Nonsinusoidal Vibration of the Mold Driven by Servo Motor with Variable Speed

Fang

et al. 2019

Mathematical Problems in Engineering

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In this paper, a fuzzy PI control method based on nonlinear feedforward compensation is proposed for the nonsinusoidal vibration system of mold driven by servo motor, rotated in single direction with variable speed. During controller design, there are mainly two issues to consider: (i) nonlinear relationship (approximate periodic function) between mold displacement and servo motor speed and (ii) uncertainties caused by backlash due to motor variable speed. So, firstly, the relationship between mold displacement and motor rotation speed is built directly based on the rotation vector method. Then, an observer is designed to estimate the uncertainties and feedforward compensation. Secondly, as the motor rotates in single direction with variable speed, a fuzzy control with bidirectional parameter adjustment is adopted to improve rapidity and stability based on the traditional PI method. Finally, some simulation results show the effectiveness of the proposed control method.

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Mechanism analysis of non-sinusoidal oscillation of continuous casting mold synchronously driven by double servomotors

Cited by 8 publications

References 8 publications

Displacement Tracking Control for Continuous Casting Mold Driven by Servo Motor Based on Composite Control Strategy

Displacement Tracking Control for Continuous Casting Mold Driven by Servo Motor Based on Composite Control Strategy

Construction of Nonsinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold

Nonlinear Compound Control for Nonsinusoidal Vibration of the Mold Driven by Servo Motor with Variable Speed

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