Abstract
This article discusses a new method for modelling elastic deformations of a foil bearing’s structure, taking into account key phenomena influencing its characteristics. Special attention was paid to the assembly preload, which has an impact on the stiffness of the supporting system and thus also on the static and dynamic properties of the rotor. There has been proposed the method which allows for the inclusion of a selected preload into the bearing model. A new FEM model of the foil bearing’s structure has been described. This model was coupled with an in-house developed flow model of the bearing and the entire rotating system. Computations were made for several assembly preload values, taking into account changes in the bearing structure stiffness as the load increases. The changes in stiffness associated with the load changes were due to the nonlinear geometry of the foils, and also due to the contact phenomena, including friction between components. The applied calculation algorithm allowed to take into account all these phenomena. The results obtained using the developed model confirm the very high influence of the foil bearing’s pre-clamp and the progressive stiffness on the properties of the rotating system. Numerical models of this type can pave the way for a further development of foil bearings and for their wider use in modern high-speed fluid-flow machines.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
DellaCorte, C.: Oil-free shaft support system rotordynamics: past, present and future challenges and opportunities. Mech. Syst. Signal Process. 29, 67–76 (2012)
Żywica, G., Bagiński, P., Banaszek, S.: Experimental studies on foil bearing with a sliding coating made of synthetic material. J. Tribol. Trans. ASME 138(1), 011301 (2016)
Bruckner, R.J.: An assessment of gas foil bearing scalability and the potential benefits to civilian turbofan engines. In: Proceedings of ASME Turbo Expo 2010, Glasgow (UK), GT2010–22118 (2010)
Kiciński, J., Żywica, G.: Steam Microturbines in Distributed Cogeneration. Springer, Cham (2014)
Tkacz, E., Kozanecka, D., Kozanecki, Z., Łagodziński, J.: Oil-free bearing development for high-speed turbomachinery in distributed energy systems—dynamic and environmental evaluation. Open Eng. 3, 343–348 (2015)
Żywica, G., Kiciński, J., Bagiński, P.: The static and dynamic numerical analysis of the foil bearing structure. J. Vib. Eng. Technol. 4(3), 213–220 (2016)
Osmanski, S., Larsen, J.S., Santos, I.F.: A fully coupled air foil bearing model considering friction—Theory & experiment. J. Sound Vib. 400, 660–679 (2017)
Akson, S., Aksit, M.F.: A fully coupled 3D thermo-elastohydrodynamics model for a bump-type compliant foil journal bearing. Tribol. Int. 82, 110–122 (2015)
Miąskowski, W., Pietkiewicz, P., Żywica, G.: Modeling foil bearings. Tech. Sci. 12, 241–248 (2009)
Tkacz, E., Kozanecki, Z., Kozanecka, D.: Numerical methods for theoretical analysis of foil bearing dynamics. Mech. Res. Commun. 82, 9–13 (2017)
Heshmat, H., Hryniewicz, P., Walton II, J.F., Willis, J.P., Jahanmir, S., DellaCorte, C.: Low-friction wear-resistant coatings for high-temperature foil bearings. Tribol. Int. 38, 1059–1075 (2005)
Jahanmir, S., Heshmat, H., Heshmat, C.: Assessment of tribological coatings for foil bearing applications. Tribol. Trans. 52(2), 231–242 (2009)
Shalash, K., Shiffmann, J.: On the manufacturing of compliant foil bearings. J. Manuf. Process. 25, 357–368 (2017)
Żywica, G., Bogulicz, M., Bagiński, P.: Modelling and analysis of the rotating systems with gas foil bearings under transient operating conditions. Tribologia 2, 167–173 (2017)
Larsen, J.S., Hansen, A.J.T., Santos, I.F.: Experimental and theoretical analysis of a rigid rotor supported by air foil bearings. Mech. Ind. 16, 106–119 (2015)
Larsen, J.S., Santos, I.F.: On the nonlinear steady-state response of rigid rotors supported by air foil bearings—theory and experiments. J. Sound Vib. 346, 284–297 (2015)
Gu, Y., Ma, Y., Ren, G.: Stability and vibration characteristics of a rotor-gas foil bearings system with high-static-low-dynamic-stiffness supports. J. Sound Vib. 397, 152–170 (2017)
Bonello, P., Bin Hassan, M.F.: An experimental and theoretical analysis of a foil-air bearing rotor system. J. Sound Vib. 413, 395–420 (2018)
Rubio, D., San Andres, L.: Bump-type foil bearing structural stiffness: experiments and predictions. J. Eng. Gas Turbines Power 128, 653–660 (2006)
Hou, Y., Ma, B., Yang, S., et al.: Experimental study on bump-foil gas bearing with different diametric clearance configurations. J. Mech. Sci. Technol. 29(5), 2089–2095 (2015)
Hoffmann, R., Liebich, R.: Experimental and numerical analysis of the dynamic behaviour of a foil bearing structure affected by metal shims. Tribol. Int. 115, 378–388 (2017)
Kiciński, J.: Rotor Dynamics. IMP PAN Publishers, Gdansk (2006)
Howard, S.A., San Andres, L.: A new analysis tool assessment for rotordynamic modeling of gas foil bearings. NASA/TM-2010-216354 (2010)
Acknowledgements
The work presented in this article was supported by the scientific project No. 2016/21/D/ST8/01711, financed by the National Science Centre (NCN) in Poland.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Switzerland AG
About this paper
Cite this paper
Żywica, G., Kiciński, J., Bogulicz, M. (2019). Analysis of the Rotor Supported by Gas Foil Bearings Considering the Assembly Preload and Hardening Effect. In: Cavalca, K., Weber, H. (eds) Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM. IFToMM 2018. Mechanisms and Machine Science, vol 60. Springer, Cham. https://doi.org/10.1007/978-3-319-99262-4_15
Download citation
DOI: https://doi.org/10.1007/978-3-319-99262-4_15
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-99261-7
Online ISBN: 978-3-319-99262-4
eBook Packages: EngineeringEngineering (R0)