Evaluation of torsional oscillations in paper machine sections

Valenzuela, M. Aníbal; Bentley, J.M.; Lorenz, Robert D.

doi:10.1109/papcon.2004.1338357

Cited by 15 publications

(21 citation statements)

References 6 publications

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“…This is due to the dependency of the parameters in the model describing the system on the rotational angle. Such torsional vibrations are a well-known problem in industrial drives like rolling mill systems [7,8], paper machines [9,10] or turbo generators [11] and also in vehicles [2]. They lead to product quality problems like damage of machinery and a shorter lifecycle of the plant.…”

Section: Motivationmentioning

confidence: 99%

Active control of speed fluctuations in rotating machines using feedback linearization

Holm

Ballesteros

Beitler

et al. 2012

Proceedings of 2012 UKACC International Conference on Control

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This paper presents a method for actively controlling torsional vibrations in rotating machines caused by angledependent parameters. The work is motivated by rotating machines with crank or cam gear mechanisms that cause fluctuations in the angular speed when the machine is driven by a constant load torque or when the speed is controlled with conventional controllers. A very general model for such a system is introduced and used to derive a control law by feedback linearization. With this control law, the speed fluctuations are completely eliminated and desired linear dynamics can be prescribed for the system. The method is tested in a simulation study with a model of a real industrial machine. Although the proposed method works well, the study is preliminary in the sense that the method has not been applied experimentally and its robustness has not been assessed.

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Section: Motivationmentioning

confidence: 99%

Active control of speed fluctuations in rotating machines using feedback linearization

Holm

Ballesteros

Beitler

et al. 2012

Proceedings of 2012 UKACC International Conference on Control

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“…The estimated value of the time constant of the motor was used to change the parameters of the speed controller and gains of suitable feedbacks in accordance with the Eq. (2)- (5). Because the load torque and the time constant of the motor are coupled, they are not estimated at the same time.…”

Section: Testing Of the Closed-loop System With The Adaptive Nekfmentioning

confidence: 99%

Adaptive Control of Two-Mass System using Nonlinear Extended Kalman Filter

Szabat

Orłowska-Kowalska

2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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In the paper the application of the nonlinear extended Kalman Filter (NEKF) to the state and parameter reconstruction of the two-mass system is reported. The torsional vibration of the drive system with elastic joint are damped using the control structure with additional feedbacks from the shaft torque and load side speed. The control structure coefficients are online retuned according to the adaptation lows which are depended on the estimate of the changeable load side inertia. The shaft torque, load side speed and load side inertia are estimated and provided to the control structure by NEKF. The initial values of the covariance matrices are setting using the genetic algorithm. Then in order to ensure the smallest state estimation errors, the simple on-line adaptation low for the element of the state covariance matrix of NEKF is proposed. The proposed control strategy is tested in the open and closed-loop control structure. Simulation results were confirmed by laboratory experiments.

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“…(2)~~~~~~~~2J + J3 (3) Tsh (S) system driven by two motors. In this system there are three rotating masses (the two motors and the presses) and this system also is a three masses system.…”

Section: A Yankee Drivementioning

confidence: 99%

Resonance effects in the electromechanical system of a tissue paper machine

Michael

Safacas

2005

2005 International Conference on Electrical Machines and Systems

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In the present work, the resonance effects in the electromechanical drive system of a tissue paper machine are investigated. The drive consists of six D.C. motors. The inertia of the motors and the driven machines in conjunction with the shafts stiffness form mechanical resonators. Because of the harmonic content of the driving torque, resonance phenomena may be triggered which may lead to undesirable results. In this paper the investigation is focused on the Yankee and presses drive, where two threemass and one five-mass-system result. The use of elastic shafts with different stiffness (and damping) in the transmission system is studied. For the investigation of the resonance effects, a mathematical model algorithm was developed to be used for computer simulation via MATLAB / SIMULINK software, considering the inertia of the motors and driven machines, and the basic mechanical characteristics of the transmission shafts, i.e. the diameter, length, thickness, stiffness and damping.. Characteristic simulation results are presented. Considering the resonance effects analysis and simulation results, mechanical design guidelines can be given for the most significant drive components in order to avoid torsional oscillations resonance phenomena and minimize torsional oscillations in the drive system.

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Evaluation of torsional oscillations in paper machine sections

Cited by 15 publications

References 6 publications

Active control of speed fluctuations in rotating machines using feedback linearization

Active control of speed fluctuations in rotating machines using feedback linearization

Adaptive Control of Two-Mass System using Nonlinear Extended Kalman Filter

Resonance effects in the electromechanical system of a tissue paper machine

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