Vibration Measurement Basics

[Mike]

Vibration Measurement Basics

1. Axial Position

• Thrust Position
• Rotor Position

2. Radial Position

3. Differential Expansion

4. Case Expansion

5. Eccentricity

Axial Position

Thrust Position

• Measurement of the position of the thrust collar in the thrust bearing assembly and how much bearing material may be used up.

• The probes are mounted on the thrust bearing observing the movement of the rotor position within the thrust bearing.

Rotor Position

Radial Position:

Proximity Probes are used in The X-Y configuration to measure radial vibration, the dc signal from the transducer can be used to indicate the radial position of the rotor within the bearing

Differential Expansion

Case Expansion

Eccentricity