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Intentional Response Reduction by Harmonic Mistuning of Bladed Disks With Aerodynamic Damping

[+] Author Affiliations
Sebastian Willeke, Lukas Schwerdt, Lars Panning-von Scheidt, Jörg Wallaschek

Leibniz Universität Hannover, Hannover, Germany

Paper No. GT2018-76601, pp. V07CT35A032; 13 pages
doi:10.1115/GT2018-76601
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 7C: Structures and Dynamics
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5115-9
  • Copyright © 2018 by ASME

abstract

A harmonic mistuning concept for bladed disks is analyzed in order to intentionally reduce the forced response of specific modes below their tuned amplitude level. By splitting a mode pair associated with a specific nodal diameter pattern, the lightly damped traveling wave mode of the nominally tuned blisk is superposed with its counter-rotating complement. Consequently, a standing wave is formed in which the former wave train benefits from an increase in aerodynamic damping.

Unlike previous analyses of randomly perturbed configurations, the mode-specific stabilization is intentionally promoted through adjusting the harmonic content of the mistuning pattern. Through a re-orientation of the localized mode shapes in relation to the discrete blades, the response is additionally attenuated by an amount of up to 7.6 %. The achievable level of amplitude reduction is analytically predicted based on the properties of the tuned system. Furthermore, the required degree of mistuning for a sufficient separation of a mode pair is derived.

Copyright © 2018 by ASME
Topics: Damping , Disks

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