An 'axial phase analysis' is a procedure
that is conducted one bearing at a time. On a smooth running machine, all
axial phase readings (on any bearing at any angular location) will be similar.
On a machine with high axial vibration, the following procedure should
be used if possible:
-
Each bearing should be checked for planar
vs. twisting motion. Any twisting motions detected should be corrected.
-
The bearings should be compared to one
another. Any significant (> 60°) phase shift should raise a flag that
something is not right.
-
Most commonly, a phase shift >60°
will be detected when comparing the bearings closest to the coupling and
will typically indicate misalignment.
-
When a phase shift is detected between
bearings on the same component (i.e. motor), housing distortion
such as soft foot should be checked.
However, transducer orientation must
be accounted for (see the next page). |
