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research-article

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

[+] Author and Article Information
Sebastian Willeke

Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30167 Hannover, Germany
willeke@ids.uni-hannover.de

Lukas Schwerdt

Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30167 Hannover, Germany
schwerdt@ids.uni-hannover.de

Lars Panning-von Scheidt

Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30167 Hannover, Germany
panning@ids.uni-hannover.de

Jörg Wallaschek

Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30167 Hannover, Germany
wallaschek@ids.uni-hannover.de

1Corresponding author.

ASME doi:10.1115/1.4040898 History: Received June 22, 2018; Revised July 02, 2018

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 (c) 2018 by ASME
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