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Localization of Natural Modes of Vibration in Bladed Disks FREE

[+] Author Affiliations
O. O. Bendiksen, N. A. Valero

Princeton University, Princeton, NJ

Paper No. 87-GT-46, pp. V005T13A004; 11 pages
doi:10.1115/87-GT-46
From:
  • ASME 1987 International Gas Turbine Conference and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Process Industries; General
  • Anaheim, California, USA, May 31–June 4, 1987
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7927-6
  • Copyright © 1987 by ASME

abstract

A study is presented of the mode localization phenomenon in imperfect blade-disk and blade-shroud-disk assemblies. This surprising phenomenon, first discovered in solid state physics, occurs in a number of periodic structures when the periodicity is broken by disorder or imperfections. Localization is signalled by the amplitude of a global blade-disk mode becoming confined to one or more local regions consisting of just a few blades, and could have serious implications for blade fatigue life. The results of this investigation indicate that unshrouded blades mounted on stiff disks are especially susceptible, and even small blade imperfections within manufacturing tolerances are likely to trigger mode localization. Increasing the interblade coupling by adding shrouds or reducing the disk stiffness greatly reduces the localization susceptibility, although certain modes may still become localized if the shrouds are free to slip.

Copyright © 1987 by ASME
Topics: Vibration , Disks
This article is only available in the PDF format.

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