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On modeling the static shape control of an adaptive air foil bearing

Sadri, Hossein and Kyriazis, Alexander and Henning, Schlums and Sinapius, Michael (2020) On modeling the static shape control of an adaptive air foil bearing. Smart Materials and Structures, 29 (8). Institute of Physics (IOP) Publishing. doi: 10.1088/1361-665X/ab99d7. ISSN 0964-1726.

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Official URL: https://iopscience.iop.org/article/10.1088/1361-665X/ab99d7

Abstract

Aerodynamic foil bearings are used in various industrial applications, e.g. in cooling turbines, small gas turbines or exhaust gas turbochargers, to support light, high-speed rotors under extreme operating conditions. Air (or another gas) is used as a lubricant in these bearings. In addition, the possible thermal deformations and production errors can be compensated by a flexible foil structure between the lubricant film and the bearing housing in air foil bearings. Since many static and dynamic properties of the lubricant are strongly dependent on the inner contour of the bearing, the idea of an adaptive air foil bearing (AAFB) is developed to optimize the performance of the bearing at different operating points. This paper focuses on a semi-analytical approach based on plate theory and the Ritz method for approximating the static shape control of a piezoelectrically actuatable AAFB. The main objective of this study is to consider adaptive bearing shells in calculating the behavior of an AAFB, as they provide additional degrees of freedom to a passive air foil bearing without adaptivity. Before the final step is taken, the model presented in this analysis is used for the shape optimization of the adaptive frame of AAFB in order to achieve the most efficient shape adaption with regard to target shapes.

Item URL in elib:https://elib.dlr.de/137130/
Document Type:Article
Title:On modeling the static shape control of an adaptive air foil bearing
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sadri, Hosseinh.sadri (at) tu-braunschweig.deUNSPECIFIED
Kyriazis, Alexandera.kyriazis (at) tu-braunschweig.deUNSPECIFIED
Henning, SchlumsTU BraunschweigUNSPECIFIED
Sinapius, MichaelMichael.Sinapius (at) dlr.deUNSPECIFIED
Date:2020
Journal or Publication Title:Smart Materials and Structures
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:29
DOI :10.1088/1361-665X/ab99d7
Publisher:Institute of Physics (IOP) Publishing
ISSN:0964-1726
Status:Published
Keywords:morphing, mfc, piezoelectric, active vibration control, shape control, air bearing, foil air bearing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Schlegel, Linda
Deposited On:09 Nov 2020 08:48
Last Modified:17 Nov 2020 14:21

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