15 documents found, page 1 of 2
The role of lubricant feeding conditions on the performance improvement and fri...
Brito, F. P.; Miranda, A. S.; Claro, José Carlos Pimenta; Teixeira, J. Carlos; Costa, Lucrécio; Fillon, M.Most conventional hydrodynamic journal bearing performance tools can not suitably assess the effect of lubricant feeding conditions on bearing performance, even though these conditions are known to affect important performance parameters such as eccentricity and powerloss. A thermohydrodynamic analysis suitable to deal with realistic feeding conditions has been proposed. Special attention was given to the treat...
The role of lubricant feeding conditions on the performance improvement and fri...
Brito, F. P.; Miranda, A. S.; Claro, José Carlos Pimenta; Teixeira, J. Carlos; Costa, Lucrécio; Fillon, M.The performance of hydrodynamic journal bearings is significantly affected by the conditions under which the lubricant is fed to the bearing. However, many conventional analyses are not prepared to suitably incorporate these parameters and their effect on bearing performance, due to the over-simplified way they treat them. A thermohydrodynamic analysis suitable for conveniently deal with lubricant feeding condi...
The work on hydrodynamic journal bearings carried out at Minho University in th...
Claro, José Carlos Pimenta; Miranda, A. S.; Costa, Lucrécio; Brito, F. P.; Fillon, M.The hydrodynamic journal bearing is still one of the most geometrically simple mechanical components, yet highly reliable and efficient and, above all, unique in what concerns to heavy duty – high load, high speed – support of rotating shafts. Analytical studies, not only to understand the physical basis of its performance, but also to develop practical tools for an expedite design, as well as to assure its rel...
On the occurrence of negative groove flow rate in twin groove hydrodynamic jour...
Brito, F. P.; Miranda, A. S.; Claro, José Carlos Pimenta; Teixeira, J. Carlos; Costa, Lucrécio; Fillon, M.This paper describes the phenomenon of negative flow rate (hot oil reflux) occurring in one of the grooves of twin axial groove hydrodynamic journal bearings. This rarely described phenomenon, which can occur under severe operating conditions, increases the risk of bearing seizure. Existing codes for predicting bearing behaviour do not seem to be suitably incorporating this phenomenon into the analysis. The pre...
An analysis of the influence of oil supply conditions on the thermohydrodynamic...
Costa, Lucrécio; Mranda, A. S.; Fillon, M.; Claro, José Carlos PimentaIn this work a thermohydrodynamic analysis has been developed in order to investigate the influence of oil supply conditions on the performance of a journal bearing. The supply conditions considered were oil supply temperature, supply pressure, groove length and groove location. To carry out this study the hydrodynamic pressure distribution inside the bearing has been determined using a mass conserving cavitati...
Temperature, flow, and eccentricity measurements in a journal bearing with a si...
Costa, Lucrécio; Miranda, A. S.; Claro, José Carlos Pimenta; Fillon, M.Parametric experiments were conducted to analyse the influence of some supply conditions on the performance of a steadily loaded journal bearing. The temperature distribution on the internal surface, the flow rate, and the bearing eccentricity were measured for different sets of operating conditions, under variable supply conditions. Quantitative information was provided which showed the effect of both shaft sp...
Experimental study of the influence of changes in load direction on the perform...
Costa, Lucrécio; Fillon, M.; Miranda, A. S.; Claro, José Carlos PimentaLaboratory tests have been carried out in order to investigate the influence of small changes in load direction on the performance of a steadily loaded hydrodynamic crown journal bearing. Hydrodynamic pressures, temperature distribution on the bush internal surface, shaft temperature, oil flow rate and bush torque were measured for fixed sets of operating conditions, at three different groove locations (4>) wit...
Estudo experimental da influência das condições de alimentação no desempenho de...
Costa, Lucrécio; Miranda, A. S.; Claro, José Carlos Pimenta; Fillon, M.Foi estudada experimentalmente a influência de alguns parâmetros de alimentação no desempenho de uma chumaceira radial hidrodinâmica com sulco de alimentação na linha de carga, carregada estaticamente. Os resultados obtidos mostram que a temperatura de alimentação condiciona fortemente todos os parâmetros de desempenho, enquanto que a pressão de alimentação afecta significativamente o caudal e ligeiramente a te...
Estudo experimental da influência das condições de alimentação no desempenho de...
Costa, Lucrécio; Miranda, A. S.; Claro, José Carlos Pimenta; Fillon, M.Foi estudada experimentalmente a influência de alguns parãmetros de alimentação no desempenho de uma chumaceira radial hidrodinâmica com sulco de alimentação na linha de carga, carregada estaticamente. Os testes foram realizados a diferentes condições de funcionamento, devidamente controladas, com condições de alimentação variáveis. Os parâmetros de desempenho medidos foram a temperatura do casquilho, o caudal ...
An experimental investigation of the effect of groove location and supply press...
Costa, Lucrécio; Fillon, M.; Miranda, A. S.; Claro, José Carlos PimentaThis paper aims to present the results of parametric experiments carried out in order to study the influence of groove location and supply pressure on the performance of a steadily loaded journal bearing with a single-axial groove. Hydrodynamic pressure and temperature distributions on the bush urface, shaft temperature, flow rate and bush torque were measured at variable supply pressure, using bushes with a si...