The aerodynamic foil bearing is a special type of air bearing in which the flexible foil structure between rotor and rigid housing supports the rotor bearing system with a greater robustness against thermal distortion and production misalignments. In such bearings, the generation of an aerodynamic pressure in the lubricating film after reaching the lift-off speed prevents the solid contact between rotor and foil structure. Since many static and dynamic properties of air foil bearings strongly depend on the inner contour of the bearing, the idea of an adaptive air foil bearing (AAFB) is developed to optimize the bearing’s performance at different operating points. This paper concentrates on a semi-analytical model based on plate theory using Ritz method for simulating the static shape control of piezoelectrically actuatable supporting segments for an AAFB under different loading conditions. The elastic suspension of the supporting segments and symmetries of the bearing are considered in the modeling. After validation by means of FEM analyses and experimental tests the influence of geometry and material is examined in a parametric study. Later on, the model is used for parameter optimization in order to achieve the most effective shape morphing.
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ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 10–12, 2018
San Antonio, Texas, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5194-4
PROCEEDINGS PAPER
A Semi-Analytical Model of Shape-Control in an Adaptive Air Foil Bearing
Hossein Sadri,
Hossein Sadri
TU Braunschweig, Braunschweig, Germany
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Alexander Kyriazis,
Alexander Kyriazis
TU Braunschweig, Braunschweig, Germany
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Henning Schlums,
Henning Schlums
TU Braunschweig, Braunschweig, Germany
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Michael Sinapius
Michael Sinapius
TU Braunschweig, Braunschweig, Germany
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Hossein Sadri
TU Braunschweig, Braunschweig, Germany
Alexander Kyriazis
TU Braunschweig, Braunschweig, Germany
Henning Schlums
TU Braunschweig, Braunschweig, Germany
Michael Sinapius
TU Braunschweig, Braunschweig, Germany
Paper No:
SMASIS2018-7915, V001T03A001; 13 pages
Published Online:
November 14, 2018
Citation
Sadri, H, Kyriazis, A, Schlums, H, & Sinapius, M. "A Semi-Analytical Model of Shape-Control in an Adaptive Air Foil Bearing." Proceedings of the ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation, and Control of Adaptive Systems; Integrated System Design and Implementation. San Antonio, Texas, USA. September 10–12, 2018. V001T03A001. ASME. https://doi.org/10.1115/SMASIS2018-7915
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