Lehn, Andreas (2017)
Air foil thrust bearings: A thermo-elasto-hydrodynamic analysis.
Technische Universität Darmstadt
Ph.D. Thesis, Primary publication
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Air foil thrust bearings: A thermo-elasto-hydrodynamic analysis | ||||
Language: | English | ||||
Referees: | Schweizer, Prof. Dr. Bernhard ; Wünsch, Prof. Dr. Olaf | ||||
Date: | 2017 | ||||
Place of Publication: | Darmstadt | ||||
Date of oral examination: | 1 February 2017 | ||||
Abstract: | A computational model for bump type air foil thrust bearings, which belong to the class of compliant hydrodynamic bearings, is developed. The computational model is able to calculate the pressure and temperature distribution in the bearing as well as the structural deformations of the bearing parts. Hydrodynamic, elastic, and thermal aspects of air foil thrust bearings are analysed in detail and design guidelines are derived. Systematic optimisation studies are performed for the shape of the lubricating gap with respect to a maximal load capacity. A Reissner-Mindlin type shell theory is applied for the top and the bump foil and different mechanisms that influence the stiffness of the compliant structure are discussed. The performance of air foil thrust bearings is compared to rigid thrust bearings for aligned, distorted and misaligned operating conditions. Based on a comprehensive thermal model, the main heat fluxes in the bearing are identified. Load capacity limiting effects as the compressibility of air, the compliance of the bearing surface, and thermally induced deformations of the rotor disk are analysed separately. Measurements of the temperature distribution in an air foil thrust bearing, based on an infrared radiation technique, are presented and compared to the predictions of the computational model. |
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URN: | urn:nbn:de:tuda-tuprints-62729 | ||||
Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering | ||||
Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Institute of Applied Dynamics (AD) 16 Department of Mechanical Engineering > Institute of Applied Dynamics (AD) > Modellierung von Öl- und Luftlagern für hochdrehende Rotoren |
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Date Deposited: | 07 Jun 2017 09:46 | ||||
Last Modified: | 09 Jul 2020 01:39 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/6272 | ||||
PPN: | 404034071 | ||||
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