Abstract
Conical gas foil bearings (CGFBs) offer the possibility to support radial and axial loads with a single bearing and thus combine the functionality of gas foil journal bearings and gas foil thrust bearings. This work presents the first numerical model representing a rigid rotor supported by two opposing shimmed CGFBs. The effect of a varying bearing clearance or bearing distance respectively on the bearing stability behaviour is investigated. The idea behind this is that the axial force necessary to maintain bearing stability onto two opposing CGFBs can be provided by the respective other. The linear stability behaviour is investigated by evaluating the eigenvalues of the Jacobian at equilibrium positions by extracting campbell diagrams. To investigate the nonlinear stability behaviour waterfall diagrams are presented and the occurring nonlinear effects such as self-excited sub- and super-harmonic vibrations and frequency modulation are explained in detail.
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Sarrazin, M., Liebich, R. (2023). On the Nonlinear Dynamics of a Rigid Rotor Supported by Shimmed Conical Gas Foil Bearings. In: Okada, M. (eds) Advances in Mechanism and Machine Science. IFToMM WC 2023. Mechanisms and Machine Science, vol 147. Springer, Cham. https://doi.org/10.1007/978-3-031-45705-0_89
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