Glossary Balancing Technology


Condition of a rotor, when unbalance causes forces or vibration at its bearings revolving with the rotor. The unbalance unit is gmm (or similar units).

Unbalance force

Force acting in a radial plane of a rotor, which is caused by an unbalance at a certain speed.

Unbalance mass

Mass with a center of gravity distant from the shaft axis.

Unbalance reduction ratio (URR)

Ratio between the reduction of the unbalance caused by a correction and the unbalance before that.

Unbalance vector

Vector described by amount and angle of unbalance.