Laboratory for Dynamics of Machines and Structures 
Dynamic mass balancing of rigid rotors

Diploma thesis, LADISK, Faculty of Mech Eng, Univ of Ljubljana, August 2014

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This work deals with the mass balancing of rigid rotors from data acquisition to the identification of mass imbalance and a modification of balancing machine for identification of mass unbalance in rotor assembly. First of all, the experimental setup of the measurement chain was made to capture the measured quantities. Then the analytical model was built, which calculates the angle and the magnitude of mass unbalance from measured forces in supports and angle rotation indication. The analytical model was verified with simulated data before using it on the balancing machine. The accuracy of identification was verified with the usage of precision rotor. Afterwards a modification of balancing machine was made with which mass unbalance of rotor assembly could be identified. To achieve the ultimate goal, the noise and vibrations of ten samples were measured. First measurements were done for samples with the existing technology. For those samples additional dynamic mass balancing and remeasurements of noise and vibrations were made. In conclusion the obtained results were compared.