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  Estonian Journal of Engineering

ISSN 1736-7522 (electronic)  ISSN 1736-6038  (print)

 An international scientific journal
Formerly: Proceedings of the Estonian Academy of Sciences Engineering
(ISSN 1406-0175)
Published since 1995

Estonian Journal of Engineering

ISSN 1736-7522 (electronic)  ISSN 1736-6038  (print)

 An international scientific journal
Formerly: Proceedings of the Estonian Academy of Sciences Engineering
(ISSN 1406-0175)
Published since 1995

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Dynamic geometry of a rotating cylinder with shell thickness variation; pp. 285–296

(Full article in PDF format) doi: 10.3176/eng.2010.4.04


Authors

Jari Juhanko, Esa Porkka, Thomas Widmaier, Petri Kuosmanen

Abstract

This research is based on observations on paper quality problems. These observed quality problems were found out to be synchronous to the half of the perimeter of the backing roll of the blade coating station, and to be a function of the running speed. The backing roll has a large diameter compared with its shell thickness. Run-out measurement of the roll showed a running speed dependent run-out behaviour. Ultrasonic shell thickness measurement showed a relatively large systematic variation. The thickness measurement data was used as geometry information in two different FE models. The results from the analyses of these two FE models showed rotational speed dependent geometry changes, showing that the shell thickness variation is a possible cause of the observed paper quality problems.

Keywords

paper machine, roll geometry, roll dynamics, deformation, dynamic roundness.

References

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  2. Kuosmanen , P. Predictive 3D Roll Grinding Method for Reducing Paper Quality Variations in Coating Machines. Thesis , Helsinki University of Technology , Publications in Machine Design 2/2004 , Espoo , 2004.

  3. Hilden , K. and Peranto , J. Paper analysis: the key to optimizing and troubleshooting paper machines. Pulp and Paper Canada , July 2000.

  4. Juhanko , J. Dynamic Behaviour of a Paper Machine Roll. Licentiate Thesis. Helsinki University of Technology , Laboratory of Machine Design , Espoo , 1999 (in Finnish).

  5. ISO 11342 Mechanical vibration – Methods and criteria for the mechanical balancing of flexible rotors , 1994.

  6. Keskiniva , M. and Lauste , L. Dynamic balancing of flexible rolls of paper machines subjected to distributed unbalance loads. In Proc. Ninth World Congress on the Theory of Machines and Mechanisms. Milan , 1995.

  7. Jei , Y.-G. and Lee , C.-W. Modal analysis of continuous asymmetrical rotor-bearing systems. J. Sound Vibration , 1992 , 152 , 245–262.
doi:10.1016/0022-460X(92)90359-6

  8. Kang , Y. , Shih , Y.-P. and Lee , A.-C. Investigation of the steady state responses of asymmetric rotors. J. Vibration Acoustics , Trans. ASME , 1992 , 114 , 194–208.

  9. Fowler , K. A. , Elfbaum , G. M. , Smith , K. A. and Nelligan , T. J. Theory and application of precision ultrasonic thickness gaging. NDTnet – October 1997 , 2 , No. 10. J. British Inst. Non-Destruct. Testing , www.ndt.net/article/wt1097/ panam/panam.htm

10. Uski , T. Ultrasonic Inspection of Coatings of Paper Machine Rolls. Master’s Thesis , Helsinki University of Technology , Laboratory of Machine Design , Espoo , 1999 (in Finnish).

11. Bathe , K. J. and Wilson , E. L. Numerical Methods in Finite Element Analysis. Prentice-Hall , Englewood Cliffs , 1976.

12. Forsberg , K. Modelling of the Shell Deformations of the Tube Roll. Master’s Thesis , Helsinki University of Technology , Laboratory of Machine Design. Espoo , 2006 (in Finnish).
 
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Current Issue: Vol. 19, Issue 4, 2013





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No. 1: 20 March
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