|Classification according to machine type, rated power or shaft height||
|Classification according to support flexibility||
determined by the relationship between the machine and foundation flexibilities.
the lowest natural frequency (combined machine and support system) in the direction of measurement is higher than its main excitation frequency (this is in most cases the rotational frequency) by at least 25 percent, then the support system may be considered rigid in that direction.
|Criteria 1: Vibration magnitude||
|Evaluation zone limits
Check the Table A1, A2,A3,A4 for the values
Such measurements are primarily used during periodic vibration surveys or for diagnostic purposes.
Certain faults are more easily detected in the axial direction.
Specific axial vibration criteria are at the moment only given in the case of thrust bearings where axial vibration correlates with axial pulsations which could cause damage to the axial load-carrying surfaces.