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Snubber and shroud have been widely adopted in steam turbine last stage blades to decrease the vibration stress. The contact surfaces between snubber and shroud own obviously fractal geometry characteristics. Based on fractal geometry theory and finite element nonlinear vibration theory, the fractal friction model that describes friction damping contact could be accurately established. In this paper, the contact fractal elements are set up and the nonlinear vibration response characteristics of a long steam turbine last stage blade with snubber and shroud are calculated. The results show that, with the increase of shroud normal force, the resonant amplitude of the blade experiences a decreasing period followed by an increasing period while the modal damping ratio increases first and then decreases when there is only shroud contact. The regulations are similar when there are both shroud and snubber contacts. The resonant frequency increases until the normal contact forces increase to some degree.
PAPER REVISED: 2016-03-15
PAPER ACCEPTED: 2016-03-26
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THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Supplement 3, PAGES [S887 - S894]
  1. Zhao, Z. H., et al., A Review of Research on Damper of Turbine Blade, Turbine Technology, 50(2008), 1, pp. 1-5
  2. Menq, C. H., et al., The Influence of a Variable Normal Load on the Forced Vibration of a Frictionally Damped Structure, Journal of Engineering for Gas Turbines and Power, 108(1986), pp. 300-305
  3. Yang, B. D., et al., Stick-slip-separation Analysis and Non-linear Stiffness and Damping Characterization of Friction Contacts Having Variable Normal Load, Journal of Sound and Vibration, 210(1998), pp. 461-481
  4. Cigeroglu, E., et al., One-dimensional Dynamic Microslip Friction Model, Journal of Sound and Vibration, 292(2006), pp. 881-898
  5. Majumdar, A., et al., Fractal Characterization and Simulation of Rough Surfaces, Wear, 136(1990), pp. 313-327
  6. Majumdar, A., et al., Fractal Model of Elastic-plastic Contact Between Rough Surfaces, Journal of Tribology, 113(1991), pp. 1-11
  7. Yan, W., et al., Contact Analysis of Elastic-plastic Fractal Surfaces, Journal of Applied Physics, 84(1998), 7, pp. 3617-3624
  8. Komvopoulos, K., Ye, N., Three-dimensional Contact Analysis of Elastic-plastic Layered Media with Fractal Surface Topographies, Journal of Tribology, 123(2001), 3, pp. 632-640
  9. Goerke, D., et al., Normal Contact of Fractal Surfaces Experimental and Numerical Investigations, Wear, 264(2008), pp. 589-598
  10. Jiang, S., Y., et al., A Contact Stiffness Model of Machined Plane Joint Based on Fractal Theory, Journal of Tribology, 132(2010), 1, pp. 1-7
  11. Liu, Y., L., et al., A Friction Contact Stiffness Model of Fractal Geometry in Forced Response Analysis of a Shrouded Blade, Nonlinear Dynamics, 70(2012), 3, pp. 2247-2257
  12. Borodich, F. M., et al., Similarity and Fractality in the Modelling of Roughness by a Multilevel Profile with Hierarchical Structure, International Journal of Solids Structures, 36(1999), 17, pp. 2585-2612
  13. Majumdar, A., et al., Fractal Network Model for Contact Conductance, Journal of Heat Transfer, 113(1991), 3, pp. 516-525
  14. Kogut, L., et al., Electrical Contact Resistance Theory for Conductive Rough Surfaces, Journal of Applied Physics, 94(2003), 5, pp. 3153-3162

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence