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Mode Localization of a Cracked Blade-Disks FREE

[+] Author Affiliations
J. H. Kuang, B. W. Huang

National Sun Yat-Sen University, Kaohsiung, Taiwan, R. O. C.

Paper No. 98-GT-105, pp. V005T14A013; 8 pages
doi:10.1115/98-GT-105
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7866-8
  • Copyright © 1998 by ASME

abstract

In this paper, the effect of blade crack on the mode localization of a rotating blade-disk is studied. Pretwisted taper beams are used to simulate blades of a blade-disk. The crack on the blade can be regarded as a local disorder of this periodically coupled blades system. An application of Hamilton’s principle and Galerkin’s method is used to formulate the equations of motion of the mistuned system. Effects of pretwisted angle, rotating speed and crack depth of the blade on the in-plane and off-plane mode localizations of a rotating system are investigated. Numerical results indicate that the increase of rotating speed, pretwisted angle and crack depth could enhance the localization phenomenon significantly.

Copyright © 1998 by ASME
Topics: Disks , Blades
This article is only available in the PDF format.

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