The dynamics of rotors running on lubricated bearings is complex. While the linearized analysis allows to study the stability in the small and phenomena like oil whirl and oil whip, more complex behaviour, that may include chaotic motion, requires a fully nonlinear analysis. Since lubricated bearings behave like anisotropic supports, complex whirling pattern can be expected when the rotor is anisotropic. The aim of the present paper is to investigate to what extent the anisotropy of the rotor affects its dynamic behaviour. In particular, the interactions between the instability ranges due to rotating anisotropy and to oil whip are searched. The rotor models are built using DYNROT FEM code to build the basic rotor model and to obtain linearized solutions. The linear model of the rotor is then mated to nonlinerar bearing models and integrated numerically in time. Time domain results allow to draw some general conclusions applicable to simplified models as well as to real-world rotors.
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ASME 8th Biennial Conference on Engineering Systems Design and Analysis
July 4–7, 2006
Torino, Italy
ISBN:
0-7918-4250-9
PROCEEDINGS PAPER
Oil Whip and Unstable Whirling in Anisotropic Rotors on Lubricated Bearings
Giancarlo Genta,
Giancarlo Genta
Politecnico di Torino, Torino, Italy
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Nicola Amati
Nicola Amati
Politecnico di Torino, Torino, Italy
Search for other works by this author on:
Giancarlo Genta
Politecnico di Torino, Torino, Italy
Nicola Amati
Politecnico di Torino, Torino, Italy
Paper No:
ESDA2006-95337, pp. 231-240; 10 pages
Published Online:
September 5, 2008
Citation
Genta, G, & Amati, N. "Oil Whip and Unstable Whirling in Anisotropic Rotors on Lubricated Bearings." Proceedings of the ASME 8th Biennial Conference on Engineering Systems Design and Analysis. Volume 3: Dynamic Systems and Controls, Symposium on Design and Analysis of Advanced Structures, and Tribology. Torino, Italy. July 4–7, 2006. pp. 231-240. ASME. https://doi.org/10.1115/ESDA2006-95337
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