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Experimental comparison of the performance of a journal bearing with a single a...
Brito, F. P.; Miranda, A. S.; Claro, José Carlos Pimenta; Fillon, M.It is often assumed that a journal bearing will operate more effectively with a twin groove arrangement than a single groove one, but little evidence has been presented in support of this. An experimental assessment of a journal bearing with either one or two axial grooves located perpendicularly to the load line was performed. It was found that under heavy loaded operation the twin groove configuration might a...
The role of lubricant feed temperature on the performance of twin groove journa...
Brito, F. P.; Miranda, A. S.; Claro, José Carlos Pimenta; Fillon, M.An experimental assessment of the influence of lubricant feed temperature (Tf) on the behaviour of twin groove hydrodynamic journal bearings has been undertaken. Several loads, shaft speeds and bearing geometries were tested under constant lubricant feed pressure (pf), while Tf took four different values between 29ºC and 58ºC. It was found that the increase of Tf has an effect in bearing performance which is an...
Increased levels of glutamate in the central nervous system are associated with...
Miranda,A.S.; Vieira,L.B.; Lacerda-Queiroz,N.; Souza,A.H.; Rodrigues,D.H.; Vilela,M.C.; Gomez,M.V.; Machado,F.S.; Rachid,M.A.; Teixeira,A.L.Cerebral malaria (CM) is a severe complication resulting from Plasmodium falciparum infection. This condition has been associated with cognitive, behavioral and motor dysfunctions, seizures and coma. The underlying mechanisms of CM are incompletely understood. Glutamate and other metabolites such as lactate have been implicated in its pathogenesis. In the present study, we investigated the involvement of glutam...
Experimental investigation of the influence of supply temperature and supply pr...
Brito, F. P.; Bouyer, J.; Fillon, M.; Miranda, A. S.An experimental study of the influence of oil supply temperature and supply pressure on the performance of a 100mm plain journal bearing with two axial grooves located at ±90º to the load line was carried out. The hydrodynamic pressure at the mid-plane of the bearing, temperature profiles at the oil-bush and oil-shaft interfaces, bush torque, oil flow rate, and the position of the shaft were measured for variab...
Experimental investigation on the thermal behavior and performance characterist...
Brito, F. P.; Bouyer, J.; Fillon, M.; Miranda, A. S.An experimental investigation of the influence of applied load and rotational speed on the performance of a 100mm diameter plain journal bearing with two axial grooves located at ±90º to the load line has been carried out. The applied load varied from 2 to 10kN, whereas the rotational speed ranged from 1000 to 4000 rpm. Measurements of hydrodynamic pressure, temperature profiles at the oil-bush and oil-shaft in...
Thermal behaviour and performance characteristics of a twin axial groove journa...
Brito, F. P.; Bouyer, J.; Fillon, M.; Miranda, A. S.An experimental study of the influence of applied load and oil supply temperature on the performance of a 100mm plain journal bearing with two axial grooves located at ±90º to the load line has been carried out. Hydrodynamic pressure at the mid-plane of the bearing, temperature profiles at the oil-bush and oil-shaft interfaces, bush torque, oil flow rate and shaft position were measured for variable operating c...
Wear mechanisms in functionally graded aluminium matrix composites : effect of ...
Gomes, J. R.; Ribeiro, A. R.; Vieira, A. C.; Miranda, A. S.; Rocha, L. A.Abstract. Functionally graded aluminium matrix composites reinforced with SiC particles are attractive materials for a broad range of engineering applications in the automotive, aircraft, sports, military and aerospace industries, whenever a superior combination of surface and bulk mechanical properties are required. In general, these materials are developed for the production of high wear resistant components....
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...
Effects of ion bombardment on properties of d.c. sputtered superhard (Ti, Si, A...
Ribeiro, E.; Malczyk, A.; Carvalho, S.; Rebouta, L.; Fernandes, J. V.; Alves, E.; Miranda, A. S.A d.c. reactive magnetron sputtering technique was used to deposit (Ti, Si, Al)N films. The ion current density in the substrate was varied by the superimposition of an axially symmetric external magnetic field between the substrate and target. It was found that the variation of the magnetic field strength induced changes in the ion current density in the substrate with a consequent change in film properties. X...
Effects of ion bombardment on properties of d.c. sputtered superhard (Ti, Si, A...
Ribeiro, E.; Malczyk, A.; Carvalho, S.; Rebouta, L.; Fernandes, J. V.; Alves, E.; Miranda, A. S.A d.c. reactive magnetron sputtering technique was used to deposit (Ti, Si, Al)N films. The ion current density in the substrate was varied by the" superimposition of an axially symmetric external magnetic field between the substrate and target. It was found that the variation of the magnetic field strength induced changes in the ion c~ent density in the substiate with a consequent c:hange in film properties. X...
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