roll eccentricity effects

Roll Eccentricity Control for Strip Rolling Mills ...

Jul 01, 1987  Eccentricity Estimator A number of measurements including roll force, measured exi t thickness and ro11gap position contain strong evidence of the presence of roll eccentricity effects when closed loop "gaugemeter" control is applied in the absence of eccentricity control.

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Strip Thickness Control of Cold Rolling Mill with Roll ...

Nov 12, 2013  Effects of roll eccentricity on output strip thick- ness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation. In the model, roll eccentricity modifies Equation (5) as [12]: out. F hS e M =++ (7) where. e is the roll eccentricity. 4. Basic Principle of Fuzzy-Neural Network

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An adaptive on-line sensor for roll eccentricity ...

Jul 01, 1992  The eccentricity effects are also taken into account within this model (Teoh et al, 1984). Rollgap controller: The roll gap position control system. 7. Conclusion This paper has presented a novel roll eccentricity sensor which retrieves the required roll eccentricity con- troller reference signal.

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Polynomial LQG control of back-up-roll eccentricity gauge ...

Jun 01, 1994  Back-Up-Roll eccentricity effects. For various reasons (thermal expansion, roll wear, and non-perfect grinding) it is not possible to guarantee perfectly circular Back-Up-Rolls or work rolls. However, because of the larger diameter of the Back-Up-Roils, their non- circular nature has the more significant effect.

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Automatic eccentricity compensation

the roll eccentricity: A) force affected by roll eccentricity (kN). B) compensator’s trim to HGC (mm). 2 The core of the D-REC (Danieli Roll Eccentricity Compensation) is the FAFC (Frequency Adaptive Feed-forward Cancellation) algorithm: for identifying online the correct frequency, the amplitude and the phase of the correction. Roll ovality

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Neural network for identification of roll eccentricity in ...

Jun 15, 1996  The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.

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WINDER ROLL VIBRATION Winder Vibration Related to Set ...

eccentricity of a roll when it is being wound. The model shows that there is no effect until the wavelength of the variation is equal to the circumference of the roll being wound and at this diameter there is a step change in eccentricity. This model explains some of the vibration effects seen in the case study. INTRODUCTION

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The Effects of Lateral Eccentricity on Failure Loads and ...

The effects of eccentricity on peak loads, kinematics, and canal occlusions were evaluated using unpaired Student t-tests. Injuries were diagnosed by a spine surgeon and scored. Classification functions were developed using discriminant analysis. The high eccentricity group had

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(PDF) Winder Roll Throwouts Publish Jake Zwart ...

To confirm this speculation, a model of is equal to the set circumference, at which point there is a step roll eccentricity caused by MD caliper variation was created. change in eccentricity. This model explains some of the effects This model treats paper as a

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An Improved Strip Thickness Controller for a Rolling Mill ...

Jul 01, 1984  The strategy is based on a model which represents the effects of backup-roll eccentricity, the plastic deformation process and elastic strains in the mill stand components. The strategy overcomes many of the fundamental difficulties inherent in earlier approaches. An important feature of the design is its ability to track an arbitrary backup ...

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Strip Thickness Control of Cold Rolling Mill with Roll ...

Nov 12, 2013  Effects of roll eccentricity on output strip thick- ness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation. In the model, roll eccentricity modifies Equation (5) as [12]: out. F hS e M =++ (7) where. e is the roll eccentricity. 4. Basic Principle of Fuzzy-Neural Network

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Strip Thickness Control of Cold Rolling Mill with Roll ...

Effects of roll eccentricity on output strip thickness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation. In the model, roll eccentricity modifies Equation (5) as : (7) where e is the roll eccentricity. 4. Basic Principle of Fuzzy-Neural Network

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WINDER ROLL VIBRATION Winder Vibration Related to Set ...

eccentricity of a roll when it is being wound. The model shows that there is no effect until the wavelength of the variation is equal to the circumference of the roll being wound and at this diameter there is a step change in eccentricity. This model explains some of the vibration effects seen in the case study. INTRODUCTION

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Automatic eccentricity compensation

the roll eccentricity: A) force affected by roll eccentricity (kN). B) compensator’s trim to HGC (mm). 2 The core of the D-REC (Danieli Roll Eccentricity Compensation) is the FAFC (Frequency Adaptive Feed-forward Cancellation) algorithm: for identifying online the correct frequency, the amplitude and the phase of the correction. Roll ovality

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Online Monitoring System Design for Roll Eccentricity in ...

Roll-eccentricity-induced disturbances can result in strip thickness deviation and product quality degradation, and a conventional control strategy cannot regulate this kind of periodic ...

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(PDF) Application of Repetitive Control to Eccentricity ...

Repetitive control is applied here to compensate for roll eccentricity disturbances in thickness control of the cold rolling process. A unique aspect of the process is that the eccentricity ...

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US8491081B2 - System and method for compensating for roll ...

A printer includes a plurality of a plurality of printheads and a plurality of rolls positioned opposite the printheads along a media path in the printer. Print media contact and move over the rolls as the printheads eject ink onto the print media moving along the media path. A controller is configured to generate a signal to operate a printhead with reference to an angular position of a roll ...

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The Effects of Lateral Eccentricity on Failure Loads and ...

The effects of eccentricity on peak loads, kinematics, and canal occlusions were evaluated using unpaired Student t-tests. Injuries were diagnosed by a spine surgeon and scored. Classification functions were developed using discriminant analysis. The high eccentricity group had

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US4910985A - Method and apparatus for the detection and ...

The invention provides a new apparatus for the detection, measurement and display of roll and roll bearing eccentricity in a rolling mill, and also an apparatus for correction of such eccentricities. The apparatus comprises individual narrow band-pass filter modules, each dedicated to the detection and development of a signal corresponding to one eccentricity, such as fundamental back-up roll ...

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High-Quality Steel Rolling: Theory and Practice - Vladimir ...

Causes and Effects of Roll Eccentricity . 249: Methods of Roll Eccentricity Compensation . 274: Theory of Width Change . 315: Methods of Width Change by Casting and Rolling . 351: Methods of Width Change by Pressing . 377: Strip Profile and Flatness Analysis . 529: Roll Bending Analysis . 561:

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Strip Thickness Control of Cold Rolling Mill with Roll ...

Effects of roll eccentricity on output strip thick - ness. usually includes its effects. The eccentricity components . remaining in the mill exit thickness after compensation.

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Strip Thickness Control of Cold Rolling Mill with Roll ...

DOI: 10.4236/ENG.2014.61005 Corpus ID: 30768077. Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network @article{Hameed2014StripTC, title={Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network}, author={W. I. Hameed and K. Mohamad}, journal={Engineering}, year={2014},

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Technological control for cold rolling processes

Roll eccentricity control Irregularities in roll geometry cause periodic varia-tions in the roll gap, which can lead to variations in thickness of the rolled product. The predominant sources of these variations are the backup rolls of the stand. The function compensates for periodic disturbance from geometric asymmetries on the backup rolls. An

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Theories and Control Technologies for Web Handling in the ...

However, the effects of the factors generating the tension disturbances such as roll eccentricity and temperature fluctuation in the drying section were not considered. They also developed an adaptive observer to estimate the roll eccentricity owing to an asymmetric roll shape and compensate for tension disturbance due to the roll eccentricity ...

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Eccentricity and hardness control in cold rolling mills ...

This cyclic eccentricity effect causes a gauge deviation, but more importantly, a signal is passed to the gap position control so to increase the eccentricity deviation. Consequently, the required high product tolerances are severely limited by the presence of the roll eccentricity effects.

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Automatic eccentricity compensation

the roll eccentricity: A) force affected by roll eccentricity (kN). B) compensator’s trim to HGC (mm). 2 The core of the D-REC (Danieli Roll Eccentricity Compensation) is the FAFC (Frequency Adaptive Feed-forward Cancellation) algorithm: for identifying online the correct frequency, the amplitude and the phase of the correction. Roll ovality

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Strip Thickness Control of Cold Rolling Mill with Roll ...

Effects of roll eccentricity on output strip thick - ness. usually includes its effects. The eccentricity components . remaining in the mill exit thickness after compensation.

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Technological control for cold rolling processes

Roll eccentricity control Irregularities in roll geometry cause periodic varia-tions in the roll gap, which can lead to variations in thickness of the rolled product. The predominant sources of these variations are the backup rolls of the stand. The function compensates for periodic disturbance from geometric asymmetries on the backup rolls. An

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The Effects of Lateral Eccentricity on Failure Loads and ...

The effects of eccentricity on peak loads, kinematics, and canal occlusions were evaluated using unpaired Student t-tests. Injuries were diagnosed by a spine surgeon and scored. Classification functions were developed using discriminant analysis. The high eccentricity group had

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Case Studies of Winder Roll Throwouts Jake Zwart ...

Often when a roll wavelength of the variation is equal to the set circumference, at throw out occurs, a number of these factors contribute to the which point there is a step change in eccentricity. This model problem. An alternative is to make shaftless winders behave like explains some of the effects seen in the case study. shafted winders.

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High-Quality Steel Rolling: Theory and Practice - Vladimir ...

Causes and Effects of Roll Eccentricity . 249: Methods of Roll Eccentricity Compensation . 274: Theory of Width Change . 315: Methods of Width Change by Casting and Rolling . 351: Methods of Width Change by Pressing . 377: Strip Profile and Flatness Analysis . 529: Roll Bending Analysis . 561:

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US3683653A - Motor drive system for rolling mill - Google ...

Roll eccentricity correction system and method US3882705A (en) * 1974-03-07: 1975-05-13: Westinghouse Electric Corp: Roll eccentricity correction system and method US20090267554A1 (en) * 2006-08-03: 2009-10-29: Toshiba Mitsubishi-Electric Ind. Systems Corp. Driving apparatus of electric motor for reduction roll

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Theories and Control Technologies for Web Handling in the ...

However, the effects of the factors generating the tension disturbances such as roll eccentricity and temperature fluctuation in the drying section were not considered. They also developed an adaptive observer to estimate the roll eccentricity owing to an asymmetric roll shape and compensate for tension disturbance due to the roll eccentricity ...

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Eccentricity (mathematics) - Wikipedia

In mathematics, the eccentricity of a conic section is a non-negative real number that uniquely characterizes its shape.. More formally two conic sections are similar if and only if they have the same eccentricity.. One can think of the eccentricity as a measure of how much a

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Method of measuring and compensating roll eccentricity of ...

The varying of the roll eccentricity values shown in the graphs is a result of the shape irregularity of the backup rolls 31, 32. For clarifying purpose, some denominations are first made to the backup rolls. ... thus compensates the effects caused by the backup roll eccentricities.

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Application Of Repetitive Control To Eccentricity ...

roll eccentricity can be a sum of four periodic components. If the top and bottom rolls have nearly ... effects of individual repetitive controllers. It can be shown that, without the link between ...

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Unwind/rewind eccentricity control for rolling mills ...

Roll eccentricity control system for a rolling apparatus: 1985-10-08: Yamaguti et al. 72/8: 4531392: Phase compensator for gauge control using estimate of roll eccentricity: 1985-07-30: Puda: 72/10: 4222254: Gauge control using estimate of roll eccentricity: 1980-09-16: King, Jr. et al. 72/8: 4173133: Continuous rolling mill: 1979-11-06: Imai ...

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Jake Zwart - Academia.edu

The model shows there is no roll eccentricity until the wavelength of the variation is equal to the set circumference, at which point there is a step change in eccentricity. This model explains some of the effects seem in the case study. Keywords: roll throwouts, throw outs, winder, eccentricity

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