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 are 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 (FMM). 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.
Transient Forced Response Analysis of Mistuned Steam Turbine Blades During Startup and Coastdown
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 4, 2014; final manuscript received July 5, 2016; published online August 16, 2016. Editor: David Wisler.
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Siewert, C., and Stüer, H. (August 16, 2016). "Transient Forced Response Analysis of Mistuned Steam Turbine Blades During Startup and Coastdown." ASME. J. Eng. Gas Turbines Power. January 2017; 139(1): 012501. https://doi.org/10.1115/1.4034151
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