Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
STABILITY OF A FLEXIBLE ROTOR WITH LUBRICATED BEARINGS – A STOCHASTIC APPROACH
Submission Author:
Laís Bittencourt Visnadi , DF
Co-Authors:
Laís Bittencourt Visnadi, Helio Fiori de Castro
Presenter: Laís Bittencourt Visnadi
doi://10.26678/ABCM.COBEM2019.COB2019-0078
Abstract
This paper considers the impact of variabilities of bearing parameters on the threshold of stability of rotating systems, considering the fluid-induced instability. A Laval model of rotor was considered supported by cylindrical hydrodynamic bearings. The parameters considered to present variabilities were the bearing clearance and the oil viscosity. It was indicated that the uncertainties around the stability threshold depend on the position of the shaft on the bearing and the stability limit for the system. These aspects are characterized by two curves, and the region that they cross each other are determinant for the uncertainties presented on the stability threshold. This analysis was done applying additional static loads on the shaft.
Keywords
rotating machinery, Jeffcott model, Fluid-induced stability, Stability threshold, uncertainty quantification
