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 (MT). Through a reorientation 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.
Intentional Response Reduction by Harmonic Mistuning of Bladed Disks With Aerodynamic Damping
Manuscript received June 22, 2018; final manuscript received July 2, 2018; published online October 24, 2018. Editor: Jerzy T. Sawicki.
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Willeke, S., Schwerdt, L., Panning-von Scheidt, L., and Wallaschek, J. (October 24, 2018). "Intentional Response Reduction by Harmonic Mistuning of Bladed Disks With Aerodynamic Damping." ASME. J. Eng. Gas Turbines Power. December 2018; 140(12): 121010. https://doi.org/10.1115/1.4040898
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