The reason is that once the film thickness h at a position changes, the film pressure
will alter correspondingly to maintain continuity.
Given the experimental film pressure
distributions shown in Figure 2, numbers 2 and 3 bearing pads are loaded, whereas numbers 1 and 4 bearing pads are unloaded.
The precession motion of the journal is induced by residual unbalance of the rotor and generates a hydrodynamic squeeze film pressure
distribution that exerts reaction forces over the journal, providing the damping force to attenuate the transmitted forces and in turn reducing the rotor vibration.
Although shaft center eccentricity cannot be calculated here for bearing-neutral positions that were not accurately defined, relative shaft orbits of the textured bearings are available, which indirectly demonstrates that reasonable texture could change oil film pressure
and result in more dense shaft orbits (see Figure 6).
The C04TB1 face collar increases stiffness, prevents the shaft or bushings from moving side-to-side, and preloads opposing thin film pressure
, maintaining the perfect gap and tolerances.
The boundary condition of oil film pressure
is as follows:
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In this particular case such negative values occur only for gas-like isotherms, that is, in situations when the film pressure
is almost zero for small relative deformations.