Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
PC Vibration Measurement System VibroMetra

Test runs

Unbalance is measured indirectly by the vibration which the rotator is generating by centrifugal force. The magnitude of vibration does not only depend on the unbalance. It is also influenced by the stiffness of machine parts and the foundation. A machine with flexible foundation will vibrate stronger than the same machine with stiff foundation.
VM-BAL conducts test runs to evaluate the behavior of an unknown rotor. For one-plane balancing two test runs are needed, for two-plane balancing there are three test runs.
  • Test runs typically start with the "initial run". The rotor remains in unchanged condition and its vibration is measured at constant speed.
  • After this, the mass in plane A is changed and test run A is started.
  • For two-plane balancing this procedure needs to be repeated for plane B.
The test runs are selected in the list of measuring runs. In the beginning there is only one entry of the initial run. If the initial run was finished the next test run will be shown. You are guided through the process step by step.