Do we observe high axial vibration (and more than radial vibrations) in all centrifugal fans ?
I have a case where overhung centrifugal fan driven by motor and coupled with belt drive. Following overall velocities (10-1000 Hz RMS) recorded,
Axial: 15 mm/s, Horizontal: 12 mm/s, Vertical: 8 mm/s
I have also attached spectra (freq vs RMS velocity). What are the possible faults; to me looks like looseness.
Similar cases (high axial vibration for centrifugal fans) reported earlier in this forum. I was wondering whether its machine configuration, fan operation, or common design issues (in once case it was a weak bearing block).