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The Maximum Factor by Which Forced Vibration of Blades Can Increase due to Mistuning FREE

[+] Author Affiliations
Denis S. Whitehead

Imperial College, London, England

Paper No. 96-GT-125, pp. V005T14A020; 6 pages
doi:10.1115/96-GT-125
From:
  • ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General
  • Birmingham, UK, June 10–13, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7876-7
  • Copyright © 1996 by ASME

abstract

In 1966 it was shown that the maximum factor by which the amplitude of forced vibration of blades can increase due 10 mistuning is, with certain assumptions, 1/2(1+√N), where N is the number of blades in the row. This report gives a further investigation of the circumstances when this factor can be obtained. These are, small damping, and a relationship must hold between the mistuning distribution γ(s) and the interblade coupling function c(r), where r is the mode number. The mistuning distribution must be symmetrical about the blade on which maximum amplitude is to occur, s=0. The coupling function must be symmetrical about r=R, where R is the mode number of the excitation.

If the coupling is purely mechanical, additional conditions apply. The coupling function c(r) must consist of a number of identical symmetrical sub-strips. A 1976 result for mechanical coupling is amended.

Copyright © 1996 by ASME
Topics: Vibration , Blades
This article is only available in the PDF format.

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