Text: The average position, or change in position, of a rotor in the axial direction with respect to some fixed reference. Typically, the reference is the thrust bearing support structure or other casing member close to the thrust bearing. The measurement is made with a proximity probe observing the shaft axially where a known probe gap distance/voltage represents a known position of the thrust collar with respect to the thrust bearing clearance. The probe may observe the thrust collar directly, or some other integral axial shaft surface, if such surface is close to the thrust bearing. Also, the measurement of the position or change in position. Also called thrust position.

See Also: DIFFERENTIAL EXPANSION

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