It is known that the effects of oil supply conditions on the characteristics of plain journal bearings are significant and especially the dynamic characteristics are affected by cavity region.
For various shapes (axial groove, spiral groove, X-shape groove) and positions of oil grooves, the static performance and dynamic coefficients of plain journal bearings are obtained with numerical methods. Elrods algorithm which implements JFO oil rupture/reformation boundary condition is used in order to take into account the effect of cavity region.
It is shown that in the cases of axial groove or X-shape groove the load capacity, attitude angle, nondimensional stiffness and nondimensional damping coefficients are affected by the groove position but the effect of spiral groove position is less significant.
