Dynamics of flexible rotor-shaft assembly with consideration of contact behaviors

An approach is presented for large error problems of modal analysis of shaft assembly by considering contact behaviors of shaft components. The interference of shaft assembly is firstly calculated analytically through contact theory. The modal analysis of the finite element (FE) model of rotor-shaft assembly is executed by optimizing the normal contact stiffness factor (FKN). The accuracy of simulation results is verified in good agreement with experimental modal testing. The percentage errors of the first two bending natural frequencies are 1.3% and 2.8%, respectively. It is demonstrated that accurate mode of rotor-shaft assembly can be achieved. Then critical speeds of forward and backward are obtained by Campbell diagram. In particular, the amplitude-frequency response of rotor different element node under unbalanced vibration force is obtained by unbalance response analysis. It is important to improve the assembly’s structural integrity in order to minimize operational failure.

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