Damping of vibrations in the primary drives of cold-rolling mills

Кожевникова, И. А.; Кожевников, А. В.; Sorokin, G. A.; Markushevskii, N. A.

doi:10.3103/s096709121610003x

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…As a result of the carried out studies it was established that the existing electric drive system made on the principle of subordinate regulation, does not provide damping of the strip oscillations. This can be confirmed by theoretical studies in this area [29,31], since for the existing structure due to a small coefficient of inertia and insignificant impact of the strip dynamics on the parameters of the electric drive it is impossible to provide suppression of elastic oscillations.…”

Section: Discussion Of the Resultsmentioning

confidence: 71%

“…One of the rational methods of damping elastic oscillations is the synthesis of the structure and the choice of control system parameters, since it is relatively easy to implement, can be used for any electromechanical system and does not require additional material costs [29,12].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…The following main methods are considered for use in the synthesis of control systems [12,29,30,22]:…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Developing a Mathematical Model of a Horizontal Looper Taking into Account the Features of a Steel Strip

Kuntush¹,

Брейдо²,

Zyuzev³

2018

EAI Endorsed Transactions on Energy Web

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Modern cold rolling mills include devices that form a reserve of strip to ensure the continuous operation of the line. Such devices include a horizontal looper containing a direct current drive. The disadvantage of the existing horizontal looper is significant oscillations of the metal strip in the process of its filling, with the maximum amplitude of oscillations occurring when the strip is completely filled. To study the oscillatory processes in the strip, a model of an electromechanical system has been developed. The necessity of taking into account mechanical properties of the steel strip in the development of a model of an electromechanical system has been substantiated. Mathematical and simulation models of a horizontal looper were developed in two extreme positions. The simulation models have been implemented in the MatLab software package. The results of simulation studies showed satisfactory convergence of the experiments with the physical process.

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Section: Discussion Of the Resultsmentioning

confidence: 71%

Section: Discussion Of the Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Developing a Mathematical Model of a Horizontal Looper Taking into Account the Features of a Steel Strip

Kuntush¹,

Брейдо²,

Zyuzev³

2018

EAI Endorsed Transactions on Energy Web

View full text Add to dashboard Cite

show abstract

“…One of the rational methods for damping elastic vibrations is the synthesis of the structure and the choice of control system parameters, since it is relatively easy to implement and can be used for any electromechanical system, so does not require additional material costs [12,13].…”

Section: ) Electrical Methodsmentioning

confidence: 99%

Archives of Electrical Engineering

Breido,

Kuntush

2020

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The article presents studies on the electromechanical system of a metallurgical horizontal looper in the steelmaking industry. During the operation of this unit, parameters in the system changes due to variations of length and mass of the steel strip, these variations significantly change elastic properties and reduce moments of inertia. Various methods of combating elastic vibrations in electromechanical systems are analyzed in this article. The article presents a description of experiments with a horizontal looper. A mathematical model for two extreme positions of the unit was developed based on experimental results. Simulation experiments were made and their results are presented. A new control system structure is proposed to reduce vibrations in the electromechanical system of a horizontal looper. A power-up sensor, adjuster and velocity derivative feedback were added into the model structure. The proposed feedback link structure takes into account the change of steel strip length. From the experimental data it follows that the proposed system provides effective damping of mechanical vibrations in the steel strip if its length during operation is changed.

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“…In this case, backlashes are opening in the gear pairs and high transient dynamic torques may affect tooth durability. Desynchronization of the neighbouring stands or incorrect velocity adjustment between individual drives of rolls in one stand causes periodic metal slipping, fluctuation of the tension between the stands, defects on the surface of the strip and the risk of dangerous damages of the whole mill [1]. In this relation, a method is proposed for control of universal stands in hot rolling mills [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamical processes in a multi-motor gear drive of heavy slabbing mill

Krot¹

2019

J. vibroeng.

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A real case study is represented of abrupt failures in a new multi-motor gear drive of vertical rolls in the heavy slabbing mill. Modal analysis is conducted, and the lowest torsional vibration modes are verified by the data from an industrial plant. Conditions of parametric resonances due to variable stiffness of teeth are determined within the range of working speed. The branched gear drive is investigated by the non-linear dynamical model with backlashes. It is shown that instantaneous dynamic loads in driveline are strongly dependent on the difference in gap sizes and phase shift between two intermediate gears in the output gear wheel coupling. Deviation in electrical parameters by 0.5 % is considered as the additional cause of not equal load sharing of parallel motors. Results of this research allowed preventing further failures of the gearbox and optimizing slabbing mill control. The proposed approach can be used in other multi-motor machines.

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Damping of vibrations in the primary drives of cold-rolling mills

Cited by 7 publications

References 2 publications

Developing a Mathematical Model of a Horizontal Looper Taking into Account the Features of a Steel Strip

Developing a Mathematical Model of a Horizontal Looper Taking into Account the Features of a Steel Strip

Archives of Electrical Engineering

Dynamical processes in a multi-motor gear drive of heavy slabbing mill

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