Modal Balancing of Flexible Rotors with Distributed Unbalance

Abstract A discrete dynamic balancing method for flexible rotors is proposed in this paper. The polynomial functions are adopted to characterize the mass eccentricity curve of rotor, and the relationship between the parameters of eccentricity curve and vibration response is established by finite element substructure method. Based on the vibration response at the bearing location, the parameters of mass eccentricity curve are identified, which are then decomposed into various modes to achieve the modal balance of the flexible rotor. Upon the proposed method, the simulation of a hollow rotor under cantilever support is performed, which indicates the effectiveness of the discrete dynamic balancing method.