Imbalance
|
Vibration Source
|
Exciting Frequency |
Dominant Plane |
Amplitude |
Spectral Envelope Characteristics |
Comments |
|
Mass Imbalance: Static
|
Rotor bow due to thermal stresses may cause a rise in amplitude with temperature
|
||||
|
Dynamic
|
1X |
radial |
|
generally, some 1X harmonics |
Most common form of imbalance. |
|
Couple
|
1X |
radial, axial |
|
|
|
|
Overhung Rotor
|
1X |
axial, radial |
|
|
|
*The Radial plane includes the tangential direction in all the tables.
Azima DLI provides products and services for Predictive Maintenance including vibration analysis instruments, monitoring and diagnostic software, and consulting for CBM programs.
© 2009 - Azima DLI