Abstract
Considered here is the effect of multistage coupling on the dynamics of an aircraft engine rotor with eight mistuned bladed discs on a drum-disc shaft. Each bladed disc had a different number of rotor blades. Free vibrations were examined using finite element models of single rotating blades, bladed discs, and an entire rotor. In this study, the global rotating mode shapes of flexible mistuned bladed discs-shaft assemblies were calculated, taking into account rotational effects, such as centrifugal stiffening. The thus obtained natural frequencies of the blades, the shaft, bladed discs, and the entire shaft with discs were carefully examined and compared with a tuned system to discover resonance conditions and coupling effects. Mistuning caused considerably more intensive multistage coupling than the tuned system and distorted the mode shape nodal diameters.
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Rzadkowski, R., Maurin, A. (2015). Free Vibration of Mistuned Aircraft Engine Bladed Discs. In: Kecskeméthy, A., Geu Flores, F. (eds) Interdisciplinary Applications of Kinematics. Mechanisms and Machine Science, vol 26. Springer, Cham. https://doi.org/10.1007/978-3-319-10723-3_8
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DOI: https://doi.org/10.1007/978-3-319-10723-3_8
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