Possibility to classify rigid rotors; product from mass eccentricity and angular velocity at service speed or trajectory speed of the center of mass each in mm/s (refer also to ISO 21940-11).
The amount of unbalance (with respect to a measuring or correction plane) that is specified as the maximum below which the state of unbalance is considered acceptable.
Procedure during which the mass distribution of a rotor is checked and typically is corrected to ensure that the residual unbalances, the vibration of the journals, the forces on the bearings and/or the bearing vibrations at service speed or for a speed range are within specified limits.
For example rolling element bearings with reduced clearance to support rotors from aero-engines in a low-speed balancing machine.
A machine that provides a measure of unbalance in a rotor, and that can be used for adjusting the mass distribution of that rotor to reduce the unbalance.
Resolution of the unbalance display of a balancing machine.
Putty normally used to add a test mass to a rotor during balancing.
Cycle consisting of one measuring run and the successive unbalance correction.
Speed at which the rotor is being balanced.
Component of a balancing machine containing the rotor support, which attaches to the machine bed.
In a balancing machine, a mechanical drive consisting of a motor, belt, pulleys and belt tensioner. Diameter of motor pulley and driven rotor diameter should not be close in order to avoid the generation of phantom unbalances.
Mass attached to the crank pins of a crankshaft to simulate a portion of the rotating and oscillating mass of piston and rod during balancing.
With balancing the amount and angle of vibration at shaft speed or twice the shaft speed plotted against running speed.
