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Experimental and numerical investigation of friction element dissipative effects in blade shrouding

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Abstract

Friction forces can be advantageously used as a source of passive damping in various mechanical systems. This paper deals with an experimental modelling and numerical simulation of blades interaction by means of a friction element placed in the shroud between the blade heads. The radial force, which represents the centrifugal force acting on the friction element, determines the values of contact forces between the element and blades. The experimental set-up for a couple of non-rotating blades is described in the paper, and the measured dynamic response of two blades is documented. The same situation is modelled by means of a basic and a more complex dynamical model of two blades with a friction element. The effect of friction is studied for the case of harmonic excitation by suitable frequency and subsequent free vibration attenuation. Both mathematical models are based on the finite element method combined with lumped rigid bodies. The interaction of the friction element and blades is described by normal contact and tangential friction forces derived for particular geometrical parameters of the studied mechanical system. The performed comparison of experimental and numerical results shows the satisfactory agreement and the modelling methodology could be used for possible parameter optimization.

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Acknowledgments

The work presented in this paper was supported by the research Project No. 101/09/1166 “Research of dynamic behaviour and optimization of complex rotating systems with nonlinear couplings and high damping materials” of Czech Science Foundation.

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Authors and Affiliations

  1. Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Dolejškova 5, 182 00, Praha 8, Czech Republic

    Luděk Pešek & Ladislav Půst

  2. Department of Mechanics, University of West Bohemia, Univerzitní 22, 306 14, Plzeň, Czech Republic

    Michal Hajžman, Vladimír Zeman, Miroslav Byrtus & Jan Brůha

Authors
  1. Luděk Pešek
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  2. Michal Hajžman
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  3. Ladislav Půst
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  4. Vladimír Zeman
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  5. Miroslav Byrtus
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  6. Jan Brůha
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Correspondence to Michal Hajžman.

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Pešek, L., Hajžman, M., Půst, L. et al. Experimental and numerical investigation of friction element dissipative effects in blade shrouding. Nonlinear Dyn 79, 1711–1726 (2015). https://doi.org/10.1007/s11071-014-1769-3

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  • DOI: https://doi.org/10.1007/s11071-014-1769-3

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