Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Uncertainty analysis on stability of a rigid rotor with hydrodynamic bearings
Submission Author:
Laís Bittencourt Visnadi , DF
Co-Authors:
Helio Fiori de Castro, Laís Bittencourt Visnadi
Presenter: Laís Bittencourt Visnadi
doi://10.26678/ABCM.COBEM2017.COB17-0359
Abstract
Uncertainties about project variables may generate early failures in a system. This study investigates the influence of these uncertainties on the unstable vibration of a rigid rotor with hydrodynamic bearings, due to fluid induced instability. For rotors supported by cylindrical lubricated bearings, it is known that there is a threshold of instability on the rotation speed of the system. Considering variation on bearing parameters, that may be caused by manufacturing process or wear of components, and variation of oil viscosity that may occur due to temperature variations, the Monte Carlo method was used to evaluate the variation of these threshold. Results show that points of transition may vary considerably. Considering the unstable motion as an undesirable situation, since the increase of vibration can cause severe damage, it is possible to determine a maximum allowable rotation for a determined reliability for the rotor.
Keywords
rotor, Hydrodynamic bearing, uncertainty, stability
