Balancing of flexible rotors from a single additional test

摘要

Multi-plane balancing of flexible rotors is currently performed using two approaches: (1) methods based on influence coefficients, or (2) modal methods [1]. In the first approach, the only assumption is system linearity. Rotor balancing is based on a matrix of influence coefficients, which are measured at one or more relevant spinning velocities. The number of additional test-runs needed to obtain the influence coefficients must be at least equal to the number of balancing planes. In the second approach, the rotor is modeled using a modal formulation. Then, modes are balanced one at a time, using successive sets of correcting masses, in such way that the previously balanced modes are not disturbed. The number of test-runs needed in this approach must be at least equal to the number of modes in the velocity range addressed.