Most of elasto-aerodynamic approaches under dynamic conditions proposed in the technical literature include only the static pressure induced deformation of foils. This paper presents a theoretical investigation on the effects of both static and dynamic deformations of the foils on the dynamic performance characteristics and stability of a self-acting air foil journal bearing operating under small harmonic vibrations. To take into account the dynamic deformations of foils, the perturbation method is used for determining the gas-film stiffness and damping coefficients for given values of excitation frequency, compressibility number, and compliance factor of the bump foil. The nonlinear stationary Reynolds’ equation is solved by means of the Galerkin’s finite element formulation while the finite differences method are used to solve the first order complex dynamic equations resulting from the perturbation of the transient compressible Reynolds’ equation. It was found that the dynamic properties and stability of the compliant finite length journal bearing are significantly affected by the compliance of foils especially when the dynamic deformation of foils is considered in addition to the static one by applying the principle of superposition.
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ASME/STLE 2011 International Joint Tribology Conference
October 24–26, 2011
Los Angeles, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-5474-7
PROCEEDINGS PAPER
Elasto-Aerodynamic Lubrication Analysis of a Self-Acting Foil Air Journal Bearing Available to Purchase
Hamza Bensouilah,
Hamza Bensouilah
Guelma University, Guelma, Algeria
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Mustapha Lahmar,
Mustapha Lahmar
Guelma University, Guelma, Algeria
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Benyebka Bou-Sai¨d
Benyebka Bou-Sai¨d
University of Lyon, Villeurbanne, France
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Hamza Bensouilah
Guelma University, Guelma, Algeria
Mustapha Lahmar
Guelma University, Guelma, Algeria
Benyebka Bou-Sai¨d
University of Lyon, Villeurbanne, France
Paper No:
IJTC2011-61143, pp. 159-162; 4 pages
Published Online:
February 9, 2012
Citation
Bensouilah, H, Lahmar, M, & Bou-Sai¨d, B. "Elasto-Aerodynamic Lubrication Analysis of a Self-Acting Foil Air Journal Bearing." Proceedings of the ASME/STLE 2011 International Joint Tribology Conference. ASME/STLE 2011 Joint Tribology Conference. Los Angeles, California, USA. October 24–26, 2011. pp. 159-162. ASME. https://doi.org/10.1115/IJTC2011-61143
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