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Improved Reliability of Bladed Disks due to Friction Dampers PUBLIC ACCESS

[+] Author Affiliations
Walter Sextro, Karl Popp

University of Hannover, Hannover, Germany

Ivo Wolter

Siemens AG, KWU, Mülheim a. d. Ruhr, Germany

Paper No. 97-GT-189, pp. V004T14A035; 6 pages
doi:10.1115/97-GT-189
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

Friction dampers are installed underneath the blade platforms to improve the reliability. Because of centrifugal forces the dampers are pressed onto the platforms. Due to dry friction and the relative motion between blades and dampers, energy is dissipated, which results in a reduction of blade vibration amplitudes.

The geometry of the contact is in many cases like a Hertzian line contact. A three-dimensional motion of the blades results in a two-dimensional motion of one contact line of the friction dampers in the contact plane. An experiment with one friction damper between two blades is used to verify the two-dimensional contact model including microslip.

By optimizing the friction dampers masses, the best damping effects are obtained.

Finally, different methods are shown to calculate the envelope of a three-dimensional response of a detuned bladed disk assembly (V84.3-4th-stage turbine blade) with friction dampers.

Copyright © 1997 by ASME
This article is only available in the PDF format.

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