Damaged Belt Case in a Rotary Machine

You know the belt vibration pattern well?
In this case you will see a different vibration pattern and we will till you how to interpret this behaviour 👇👇

It is normal to diagnose the faults in the rotary machines if they are matched with their known patterns, but what will you do if the pattern differs from the standard?

In this case study, we will identify another pattern for damaged belt in a rotary machine consists of pulleys and belts. It was found that the 2XBRF and its harmonics are dominant in the frequency spectrum rather than 1XBRF.

The physical meaning of this pattern is that the damage impacts the two pulleys in one revolution of this belt leading to producing two events which causes 2XBRF peak and its harmonics are the highest as shown in figure.