Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
SIGNATURE OF OIL STARVATION FAULTS IN ROTORS SUPPORTED BY HYDRODYNAMIC BEARINGS
Submission Author:
Marcus Vinícius Medeiros Oliveira , MG , France
Co-Authors:
Marcus Vinícius Medeiros Oliveira, Gregory Bregion Daniel
Presenter: Marcus Vinícius Medeiros Oliveira
doi://10.26678/ABCM.COBEM2021.COB2021-0308
Abstract
Oil starvation is a critical fault often observed in hydrodynamic bearings caused by insufficient oil supply. The early detection of starvation is important to assure good performance in rotating machines, avoiding sudden shutdowns and reducing maintenance costs. This paper aims to understand the signature of oil starvation faults in the vibrational response of rotors supported by hydrodynamic bearings. A mass-conserving bearing model is used to simulate healthy and starved lubrication conditions. The rotor is modeled by finite element method and its vibrational response is obtained by numerical integration at constant rotational speed, then decomposed in directional components using the Discrete Fourier Transform. Results shown that the oil starvation reduces the forward component while increases the backward component, increasing the anisotropy of the system. The ratio between forward and backward component presented a variation of -49% from a healthy bearing to a severely starved bearing. Furthermore, this variation achieves -65% when the vibration is observed at the outside bearing edge. Even with a noisy vibration signal of 10 dB of signal to noise ratio, the signature of oil starvation is clearly distinguishable in all the lubrication conditions evaluated. Thus, observing the directional response of a rotor is a promising strategy to detect faults of oil starvation in hydrodynamic bearings.
Keywords
Rotordynamics, Hydrodynamic bearing, Oil starvation
