Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Theoretical and experimental analysis of hydrodynamic and thermohydrodymic models of cylindrical bearings
Submission Author:
Jefferson Barbosa , SP
Co-Authors:
Leonardo Sicchieri, Arinan Dourado, Aldemir Ap Cavalini Jr, Valder Steffen Jr, Jefferson Barbosa
Presenter: Jefferson Barbosa
doi://10.26678/ABCM.COBEM2017.COB17-2372
Abstract
The hydrodynamic bearings represent an important component of rotating machines due to their large use in the industry. In this case, the load is supported by a thin film of lubricant that separates the shaft from the bearing (i.e., there is no direct contact between metal parts). Thus, this subsystem can theoretically offer infinite life, considering that the rotor operates under safe dynamic conditions and with clean lubricant. Different mathematical models can be used to represent the dynamic behavior of hydrodynamic bearings. This work is dedicated to the comparation between the results obtained by using the hydrodynamic (HD) and thermohydrodynamic (THD) models for cylindrical bearings. The HD model is based on the solution of the classical Reynolds equation, in which the oil viscosity is considered constant along the film, disregarding thermal effects. In the THD model, the Reynolds equation is modified to take into account the viscosity variation due to temperature gradients generated in the bearing. The results obtained by using both models are compared in terms of the maximum pressure, minimum oil film thickness, and the equilibrium position of shaft for a given applied load.
Keywords
cylindrical hydrodynamic bearings, hydrodynamic model, thermohydrodynamic model
