It is well-known that the vibrational behavior of a mistuned bladed disk differs strongly from that of a tuned bladed disk. A large number of publications dealing with the dynamics of mistuned bladed disks is available in the literature. The vibrational phenomena analyzed in these publications are either forced vibrations or self-excited flutter vibrations. Nearly all published literature on the forced vibrations of mistuned blades disks considers harmonic, i. e. steady-state, vibrations, whereas the self-excited flutter vibrations are analyzed by the evaluation of the margin against instabilities by means of a modal, or rather than eigenvalue, analysis. The transient forced response of mistuned bladed disk is not analyzed in detail so far. In this paper, a computationally efficient mechanical model of a mistuned bladed disk to compute the transient forced response is presented. This model is based on the well-known Fundamental Model of Mistuning. With this model, the statistics of the transient forced response of a mistuned bladed disk is analyzed and compared to the results of harmonic forced response analysis.
- International Gas Turbine Institute
Transient Forced Response Analysis of Mistuned Steam Turbine Blades During Start-Up and Coast-Down
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Siewert, C, & Stüer, H. "Transient Forced Response Analysis of Mistuned Steam Turbine Blades During Start-Up and Coast-Down." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines. Düsseldorf, Germany. June 16–20, 2014. V01BT27A022. ASME. https://doi.org/10.1115/GT2014-25654
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