Based on the transient response of a flexible rotor and the fundamental theory of back propagation(BP) neural network

a novel method for imbalance identification of flexible rotor with one disc was presented.A BPneural network identifying imbalance angle of rotor was established by using the theoretical model of the rotor

thus enabling imbalance identification of rotor through only two accelerations.Firstly

the imbalance angle was identified by BPneural network and the transient response of the first acceleration;secondly

the magnitude of the imbalance was acquired through a second acceleration using the linear relationship between the magnitude of transient flexibility and the imbalance.The experimental result verifies the effectiveness of this imbalance identification method.