Through the frequency analysis of the vibration signal you can identify and diagnose several possible problems. Although a correct interpretation of the Frequency Spectrum requires a precise knowledge of the machine, especially for rotating machines, it is possible to identify specific areas, in relation to the frequency of rotation, that need to be taken into consideration:
|Frequency Range||Potential Problems|
|Below rotational speed||This area is called subsynchronous and if any peaks occur in it, they tend to be dangerous (e.g.
journal bearing oil whirl)
|From 1 to 10 times rotational speed||This is the area of low-frequency events related to the rotation. Symptoms of all the basic mechanical faults (unbalance, misalignment, looseness, etc.) usually occur in this area|
|Above 10 times rotational speed||This is the area of high-frequency events. Symptoms of roller bearing defects, gear faults, etc. occur in this area|