Abstract
Comprehensive and deep understanding of the accurate nonlinear dynamic characteristics of the gas journal bearings plays an important role for reliable design of the rotor-bearing system. In this paper, the accurate nonlinear dynamics of a flexible rotor supported by two plain gas journal bearings (PGJB) are investigated by the free fluid-structure interaction method (FFSIM). The FFSIM does not make any simplifying assumptions, considers the interactions between the rotor shaft and the bearing sleeve at each transient time and uses the three-dimensional models for calculation. First, accuracy of the FFSIM is verified by the published experimental results. Then, bifurcation analysis, effects of rotating speed and rotor mass on shaft orbits, phase portraits and frequency response curves of the PGJB rotor system are performed, respectively. Results show that, under the same rotor system and boundary conditions, compared with the simplified two-dimensional analytical methods commonly seen in the open literature, the FFSIM could give more detailed and accurate nonlinear dynamic characteristics of the rotor-bearing system. The research of this paper is expected to further and deeply understand the accurate nonlinear dynamic characteristics of the PGJB rotor system.
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