Feasibility of the Ways to Limit Dynamic Loads of Electromechanical Systems of a Rolling Stand

Shubin, Andrey G.; Loginov, B. M.; Gasiyarov, Vadim R.; Maklakova, E.A.

doi:10.18503/2311-8318-2018-1(38)-14-25

Cited by 10 publications

(6 citation statements)

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“…The firmware of the stand controller uses an algorithm based on this chart. References [22,23] prove that this system does reduce the dynamic loads on electric engines and mechanical equipment provided accurate pre-acceleration timing and value. In most cases, the system attains 1.3 to 1.5 times lower amplitude of dynamic torque; the dynamic drop in speed is reduced similarly.…”

Section: Statement Of Problemmentioning

confidence: 99%

Dynamic Torque Limitation Principle in the Main Line of a Mill Stand: Explanation and Rationale for Use

et al. 2019

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This paper substantiates why it is necessary to limit the dynamic loads in stand shafts when closing angular gaps. The paper is a feasibility study of a concept developed specifically to limit each of the factors that affect amplitude of the dynamic torque; limitations applied are determined on a case-by-case basis. The research team studied the components of elastic torque in a dual-mass electromechanical system of Mill 5000 caused by vibrations arising from the elasticity of transmission as well as from the vibrations caused by elastic collision itself. It is shown that the lowest possible pre-acceleration is necessary for decreasing the dynamic coefficient at a near-nominal load torque. A principle of limiting dynamic loads when closing an angular gap is proposed, which implies collecting tachograms of an electric drive subjected to positive or negative acceleration before and after the fed metal is captured. The research team has developed drive control principles to implement this approach. The recommendation is to upgrade the electric drives of the reversing stand in Mill 5000.

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Section: Statement Of Problemmentioning

confidence: 99%

Dynamic Torque Limitation Principle in the Main Line of a Mill Stand: Explanation and Rationale for Use

et al. 2019

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“…Rolls have individual variable-frequency electric drives based on synchronous motors. Figure 4 shows a simplified block diagram of the speed control system [41]. Apparently, deriving the elastic torque from electrical parameters will not allow us to find the peak dynamic loads at the eigenfrequencies of the mechanical system (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25).…”

Section: Problem Formulationmentioning

confidence: 99%

Development of an Automatic Elastic Torque Control System Based on a Two-Mass Electric Drive Coordinate Observer

et al. 2021

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Development of control system based on digital twins of physical processes is a promising area of research in the rolling industry. Closed-loop control systems are developed to control the coordinates of two-mass electromechanical systems in order to limit the dynamic loads on the equipment of main rolling lines. These control systems are based on observers (digital shadows) that indirectly detect (reconstruct) the roll speed and the elastic torque of the shaft (spindle) in real time. Notably, observers are required to work fast in order to reconstruct transients attributable to shock (impact) loads. Literature review shows that the known observers, which use complex algorithms to compute coordinates, do not respond fast enough. The paper analyzes the kinematic diagram of Mill 5000, a plate rolling mill. It presents oscillograms that prove that the elastic torque does oscillate as the rolls grip the strip dynamically. The authors hereof have developed an observer that reconstructs the coordinates of the uncontrolled mass (the shaft) and the spindle torque from the parameters of the controlled mass, namely the torque and speed of the motor. The paper further rationalizes an approach that consists of simulating the processes on a model to further directly configure them on the object. The authors analyze the transients of the reconstructed two-mass system coordinates, which are associated with the rolls gripping the strip. The paper compares data against oscillograms recorded on the mill itself. The accuracy is satisfactory. The proposed observer has been used to developed a three-loop automatic speed control system for the uncontrolled mass. Controller configurations are substantiated. The paper shows coordinates obtained by simulation modeling as functions of time. It further presents experiments run on Mill 5000; the conclusions are that the amplitude and oscillations of the elastic torque drop significantly. The paper concludes with recommendations on industrial adoption of the observer and the novel electric drive coordinate control system. Study presented herein substantiates and implements a concept of developing algorithms that solve specific problems and are readily implementable on the existing equipment without need for additional computing devices. The contribution of the paper consists of stating and solving the problem of developing and testing an automatic elastic torque control system for the shaft of a heavy-duty rolling mill. This system has been implemented in the form of algorithms that run in the software of the existing industrial controllers (PLCs). It is simple and performs well. It does not need additional sensors or computers to be implemented, nor does it rely on complex computational algorithms. Such algorithms are based on computational tables that require a priori data on numerous process parameters. In our literature review, we have not come across any industrial implementation of such algorithms on hot-rolling mills.

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“…Three permanent magnets are fixed on the upper membrane, which vibrate with the frequency of the acoustic wave. The magnetic field intersects the winding of the inductor and alternating current is generated [20]. The second membrane 7 is necessary to prevent circular circulation of the working fluid (air) in the resonator 8.…”

Section: Issn 2224-5278mentioning

confidence: 99%

Motor With External Heat Supply Based on Thermo-Acoustic Effect for an Autonomous Thermal Power Plant

Mekhtiyev¹,

Yurchenko²,

Yugay³

et al. 2020

SERIES OF GEOLOGY AND TECHNICAL SCIENCES

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Feasibility of the Ways to Limit Dynamic Loads of Electromechanical Systems of a Rolling Stand

Cited by 10 publications

References 0 publications

Dynamic Torque Limitation Principle in the Main Line of a Mill Stand: Explanation and Rationale for Use

Dynamic Torque Limitation Principle in the Main Line of a Mill Stand: Explanation and Rationale for Use

Development of an Automatic Elastic Torque Control System Based on a Two-Mass Electric Drive Coordinate Observer

Motor With External Heat Supply Based on Thermo-Acoustic Effect for an Autonomous Thermal Power Plant

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