TSI: Eccentricity And Bond Phase

Eccentricity is the bending of the shaft, that is, the radial position of the shaft. Under normal operation without internal and external loads, the shaft will float in the designed position under the action of oil pressure damping. However, once the machine is subjected to a certain external or internal preload, the journal in the bearing will be eccentric, and its size is represented by the peak-to-peak value of the eccentricity, that is, the difference between the extreme values ​​of the positive and negative directions of the shaft bending.
The so-called key phase device is to open a key groove on the shaft (or add a raised key), and then use an ordinary vibration probe to align the key. When the probe detects the key, the preamplifier outputs a pulse signal, and the period between the two pulse signals is one turn. The key phase signal can also be used to indicate the phase of vibration. When the angle between the vibration probe and the key phase probe is known, the position of the unbalanced mass, that is, the position of the rotor high point, can be found. This is very important for the balance of the shaft.
The two measuring points installed vertically are the eccentric measuring points, and the other is the key phase measuring point.