Abstract: Based on the unbalance mechanism analysis of engine′s flexible rotor, the signal could be extracted and identified by using wavelet decomposition and reconstruction method. And the fault diagnosis for the rotor unbalance is accurate, also the balance problem of the flexible rotor can be solved by using modal equilibrium method.Test results show that the rotor unbalance fault can be reduced effectively and the wavelet analysis is very effective for Fault diagnosis of unbalanced rotor.

Key words: Rotor, Fault diagnosis, Oscillation, Equilibrium method