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Passive Vibration Control by Frictional Energy Dissipation in Refrigerant‐Lubricated Gas Foil Bearing Rotor Systems
Author(s) -
Leister Tim,
Seemann Wolfgang,
BouSaïd Benyebka
Publication year - 2018
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201800473
Subject(s) - foil bearing , refrigerant , dissipation , foil method , reynolds equation , work (physics) , mechanics , lubrication , vibration , rotor (electric) , compressibility , slip (aerodynamics) , materials science , structural engineering , engineering , mechanical engineering , reynolds number , thermodynamics , physics , acoustics , composite material , aerospace engineering , turbulence , gas compressor
Even though the dynamic performance of rotors supported by refrigerant‐lubricated gas foil bearings (GFBs) is very sensitive to the amount of energy dissipated in the foil structure, almost none of the existing computational models really capture dry friction with typical stick–slip transitions. The presented work addresses this shortcoming by incorporating an elasto‐plastic bristle friction law into the structural model, which is coupled in an interconnected solution approach to a Reynolds equation for non‐ideal compressible gases and to a modified Jeffcott–Laval rotor model. Numerical results confirm that properly designed GFBs have the potential to benefit significantly from the foil structure acting as a passive vibration control device.