Vibration analysis of rotor-bearing system using polynomial interpolation for squeeze film damper models

The implementation of numerical squeeze film damper (SFD) models into rotordynamic study is a time-consuming work since it is challenging to efficiently calculate the SFD forces under a variety of different situations. This paper proposes a new scheme to incorporate SFD models into rotordynamic analysis. A polynomial interpolation technique is introduced to solve for SFD forces under different operating conditions. To evaluate the efficiency of the proposed method, a rotor shaft supported by an SFD at either end has been selected for vibration study, where a finite element model is created to describe the system. The transient response of the rotor at a steady state rotational speed is presented for an open SFD application. In addition, the frequency response is evaluated by the slow acceleration scheme. The prediction resulted from the interpolation method shows excellent agreement with that from the direct method. Moreover, the proposed method significantly reduces the simulation time for application using advanced SFD models.