Stability assessment of bowed asymmetric rotors on nonlinear supports
This paper investigates the influence of residual bow on the stability of a rotating system consisting of an unbalanced Jeffcott rotor with anisotropy and two nonlinear journal bearing supports. The motion equations of the rotor system are formulated and analyzed considering most common faults and f...
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Veröffentlicht in: | Journal of the Brazilian Society of Mechanical Sciences and Engineering 2022-12, Vol.44 (12), Article 586 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | This paper investigates the influence of residual bow on the stability of a rotating system consisting of an unbalanced Jeffcott rotor with anisotropy and two nonlinear journal bearing supports. The motion equations of the rotor system are formulated and analyzed considering most common faults and features including coupling effects of unbalance, anisotropy and residual shaft bow, by applying Lagrangian dynamics and Floquet theory. Time varying system properties of stiffness and damping are introduced into the equations of motion affecting the rotor behavior, and the influence is studied with respect to the extent of the bearing nonlinearity and the rotor anisotropy. Increasing area of unsafe/unstable operation is observed when geometrical anisotropy and bearing nonlinearity are increased. The results firstly are verified for a linear rotor model and further show that the influence of unbalance defect is significantly dominant compared to residual bow in the rotor-bearing system dynamics; shaft anisotropy enhances this effect. Therefore, the novelty of this paper lies in a deep study in the stability assessment of Jeffcott rotors with combined effects of shaft bow, unbalance and anisotropy, and bearing nonlinearity. |
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ISSN: | 1678-5878 1806-3691 |
DOI: | 10.1007/s40430-022-03897-x |