Numerical Study on the Influence of Gas Foil Thrust Bearings on the Vibrational Behavior

Pronobis, Tomasz; Ramin, A.B.; Liebich, Robert

doi:10.1007/978-3-319-99262-4_8

Cited by 4 publications

(2 citation statements)

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“…Early scholars [22][23][24] used the wading method to solve the dynamic characteristics of bearings, and the influence of the working conditions and structural parameters on the dynamic stiffness coefficient and dynamic damping coefficient has also been analyzed. For instance, Balducchi et al [22] solved the Renault equation and linearized dynamic equations.…”

Section: Introductionmentioning

confidence: 99%

“…With the increase in rotational speed, the stiffness increases nonlinearly while the damping decreases rapidly. Pronobis et al [23] pointed out that the main stiffness value increases with the increase in excitation frequency, while the damping decreases with the increase in excitation frequency. The absolute values of the cross-coupling, oblique symmetry stiffness, and damping parameters decrease with the increase in excitation frequency.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Unsteady Characteristics of Gas Foil Journal Bearings with Fluid–Structure Interaction

et al. 2023

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Gas foil journal bearings (GFJBs) have been widely employed in high-speed rotating machinery in the aviation industry. However, the role of fluid–structure interaction in the unsteady aerodynamic character of the gas film and the dynamic response of the elastic foils have not yet been clarified. In this study, an unsteady shearing flow interacting with an exciting deformation of the top or bump foils was investigated by means of a large eddy simulation with bidirectional fluid–structure interaction (BFSI). The result shows that the main frequencies and amplitudes of stable fluctuations of different flow field parameters at different positions are different. The oscillating duration in the solid domain is much less than that in the fluid domain. The main positions for the interaction between the gas film pressure and the elastic foil are on both sides of θ = π. Compared with the case without FSI, the presence of the elastic foil flattens the distribution of the pressure of the gas film. As the rotational speed increases, the main frequency and the amplitude of pressure in the fluid domain continuously increase. With FSI, there is no interference frequency near the main frequency, which improves the stability of the shearing flow. However, an interference frequency appears near the main frequency of total displacement in the solid domain. The analysis in this paper lays the foundation for unsteady fluid–structure interaction research.

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