Motivated by finite element results of a bladed disk model, a discrete model and numerical analysis are developed and presented in this paper with view toward understanding effect of large geometric design factors on the vibrations of a cyclic symmetric integrally bladed rotor (IBR). It is found that nonlinear eigenvalue-loci crossing for split frequency doublet modes and eigenvalue-loci veering for repeated frequency modes having the same wavenumber content can occur when large blade span distribution and blade to disk inertia ratio are considered in the discrete IBR model. Clustering of eigen-loci is found and characterized in blade span parameter study when blade’s inertia is significant large. These three findings are new to the literature and have engineering implications on structure design and vibration control of engine components in turbine and automobile applications.

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