TABLE OF CONTENTS The rotor wants to spin about its mass axis but we want it to spin about the bearing axis. The results are force on the bearings, vibration of the bearings or a combination of both.
| Note | More rigid bearings mean less vibration and higher force. |
Our definition is taken directly from ISO 1925, paragraph 3.1. The ISO 1925 definition of balancing is:
A procedure by which the mass distribution of a rotor is checked and, if necessary, adjusted in order to ensure that the vibration of the journals and/or forces on the bearings at a frequency corresponding to service speed are within specified limits.
Note the progression check against limit, adjust if required. Note also the important phrase "corresponding to service speed". Balancing cannot fix vibration at other frequencies than the rotational.
