Vibration Analysis Sheet

 

Pick-Up

 

Filter-Out Coupled

 

 

 

 

Filter-In Coupled

 

 

 

Point

 

 

Disp.

Freq*

Vel.

Freq.*

Vel.

Freq.

Vel.

Freq.

Vel.

Freq.

Vel.

Freq.

 

Position

Mils

CPM

In/Sec

CPM

Mils

CPM

Mils

CPM

Mils

CPM

Mils

CPM

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axial

 

 

 

 

 

 

 

 

 

 

 

 

*Dominant Frequency

Before vibration difficulties are reported, accurate vibration readings should be taken and consideration given to the following:

1)How does vibration level at center line of motor compare to that at motor feet and foundation?

2)Is motor on a fabricated base or grouted in concrete?

3)When power is cut, does the vibration decay immediately or does it gradually die away?

4)Is there a large shim pack under motor feet?

5)Does vibration level change when mounting bolts are loosened one at a time? Do feet distort when bolts are loosened?

6)Is motor for coupled or belt-drive use? Is a coupling used on a long shaft motor? If so, how long is the key and what is the length of the coupling?

7)Is there a resonant condition in the system which can be checked by a hammer test?

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