Mathematical model of blades bundle with damping connections

Authors

  • Ludek Pesek Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8, Czechia
  • Ladislav Pust Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8, Czechia
  • Zhan Tsybulka Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8, Czechia
  • Vítězslav Bula Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8, Czechia

DOI:

https://doi.org/10.15587/1729-4061.2013.14878

Keywords:

Blades vibration, damping elements, rubber, mathematic models

Abstract

A very effective way against undesirable vibrations of turbine blades vibrations is introducing additional damping elements into blade shroud For detail discovering of damping processes, the dynamic tests of five blades bundle were prepared in Institute of Thermomechanics ASCR.

Before the experimental research, the preliminary solution of mathematical model has been done. System is modelled by a five masses system including viscous-elastic elements made of rubber VITON the dynamic properties of which strongly depend on the temperature and frequency. Presented contribution is oriented on the theoretical solution at 100 oC when the variability of properties must be considered.

The response curves of system with frequency variable parameters are presented. Effect of different forms of excitation force vector F = [F01, F02, F03, F04, F05], where  Fi(t) = F0icos(ωt), i =1,..5. Amplitudes F0i are selected according to the measurement in laboratory. Comparison with response curves of system with dry friction connections of masses will be mentioned at presentation as well

Author Biographies

Ludek Pesek, Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8

PhD in Technical

Ladislav Pust, Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8

Doctor of technical sciences, Academician
of the Academy of sciences of Chech
Republic

Zhan Tsybulka, Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8

engeneer

Vítězslav Bula, Institute of Thermomechanics AS CR, v.v.i., Dolejškova 5, 18200 Praha 8

engeneer

References

  1. Pešek L., Půst L.: Mathematical model of a blade couple connected by damping element. In Proceedings of the 8th International
  2. Conference on Structural Dynamics, EURODYN2011. Katolieke Universiteit Leuven, 2011, p. 2006-2011.
  3. Půst L., Pešek L.: Friction in blade system. In Computational Mechanics 2011, CD ROM edition, 2 p.
  4. Pešek L., Půst L.: Influence of dry friction damping on bladed disk vibration. In Vibration Problems ICOVP 2011. Berlin : Springer,
  5. – p. 557-564.
  6. Pešek L., Půst L..: Non-proportional nonlinear damping in experimental bladed disk. Engineering Mechanics. Vol. 17, 2010, s. 237-
  8. Jones D.G.: Handbook of Viscoelastic Vibration Damping, John Wiley&Sons Ltd, 2001
  9. Pešek, L., Půst, L. (2011). Mathematical model of a blade couple connected by damping element. In Proceedings of the 8th International Conference on Structural Dynamics, EURODYN2011. Katolieke Universiteit Leuven, 2006-2011.
  10. Půst, L., Pešek, L. (2011). Friction in blade system. In Computational Mechanics, CD ROM edition, 2.
  11. Pešek, L., Půst, L. (2011 ). Influence of dry friction damping on bladed disk vibration. In Vibration Problems ICOVP 2011. Berlin : Springer, 557-564.
  12. Pešek, L., Půst, L. (2010). Non-proportional nonlinear damping in experimental bladed disk. Engineering Mechanics, Vol. 17, 237-250.
  13. Jones, D.G. (2001). Handbook of Viscoelastic Vibration Damping, John Wiley&Sons Ltd.

Downloads

Published

2013-06-19

How to Cite

Pesek, L., Pust, L., Tsybulka, Z., & Bula, V. (2013). Mathematical model of blades bundle with damping connections. Eastern-European Journal of Enterprise Technologies, 3(12(63), 43–46. https://doi.org/10.15587/1729-4061.2013.14878

Issue

Vol. 3 No. 12(63) (2013): MODERN TECHNOLOGIES IN THE GAS-TURBINE

Section

Modern technologies in the gas-turbine

License

Copyright (c) 2014 Ludek Pesek, Ladislav Pust, Zhan Tsybulka, Vítězslav Bula

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

The consolidation and conditions for the transfer of copyright (identification of authorship) is carried out in the License Agreement. In particular, the authors reserve the right to the authorship of their manuscript and transfer the first publication of this work to the journal under the terms of the Creative Commons CC BY license. At the same time, they have the right to conclude on their own additional agreements concerning the non-exclusive distribution of the work in the form in which it was published by this journal, but provided that the link to the first publication of the article in this journal is preserved.

A license agreement is a document in which the author warrants that he/she owns all copyright for the work (manuscript, article, etc.).
The authors, signing the License Agreement with TECHNOLOGY CENTER PC, have all rights to the further use of their work, provided that they link to our edition in which the work was published.
According to the terms of the License Agreement, the Publisher TECHNOLOGY CENTER PC does not take away your copyrights and receives permission from the authors to use and dissemination of the publication through the world's scientific resources (own electronic resources, scientometric databases, repositories, libraries, etc.).
In the absence of a signed License Agreement or in the absence of this agreement of identifiers allowing to identify the identity of the author, the editors have no right to work with the manuscript.
It is important to remember that there is another type of agreement between authors and publishers – when copyright is transferred from the authors to the publisher. In this case, the authors lose ownership of their work and may not use it in any way.