A parametric study of a porous self-circulating hydrodynamic bearing

Friction and 2D position measurements in small journal bearings

“…In accordance with theory presented in [16] taking into account porosity and numerical investigations [6][7][8][9][10], in the case of low radial loading F r the shaft is in contact with the bearing surface at low speed to lift off at some specific 125 speed. This was identified by the simultaneous friction torque measurement to occur at (or in some cases slightly before) the speed of minimum friction.…”

“…Friction torque measurements in the range of μN m are extremely sensitive to all kinds of external forces and kinematic constraints which favor or prevent the 10 formation of a fluid film necessary to separate the sliding bodies. Experiments, therefore, should reproduce the common case of unconstrained displacement with a radial load.…”

“…A similar technique was applied in [1][2][3], assuming ideal geome-20 tries, which is not sufficient for miniature systems where fabrication tolerances cannot be neglected. reservoir was simulated in [10].…”

Tribological Properties and Oil Flow Observation of Porous Sintered Metal with Dimple Texturing by Block-on-Disk Friction Tester

“…Whereas, an oil leakage and a lower load capacity compared with solid journal bearings are disadvantages. To improve its tribological properties, a considerable number of studies concerning the lubrication mechanism of oil-impregnated journal bearings have been conducted [5][6][7][8][9]. The basic model of fluid flow over a permeable block have proposed by Beavers and Joseph [10].…”

“…They presented that when the permeability increases, the maximum pressure and the load capacity decrease, and the attitude angle increase. Balasoiu et al have proposed numerical analysis of a cylindrical porous journal bearing characterized by a self-circulating lubricating system [7]. Their results presented the permeability of the porous media is controlling not only the pressure in the bearing clearance, as well as in the outer diameter of journal bearings.…”