MODELLING AND ANALYSIS OF ROTATING SYSTEMS WITH GAS FOIL BEARINGS UNDER TRANSIENT OPERATING CONDITIONS
Journal Title: Tribologia - Year 2017, Vol 272, Issue 2
Abstract
Gas foil bearings are on the cutting edge of bearing systems that spread worldwide. Although it is a common practice to apply such systems to high-speed fluid-flow machinery, their modelling and analysis still pose a number of problems. This article describes the methodology used to assess dynamic properties of a rotor-bearings system supported by foil bearings. Particularly close attention has been paid to the system operation in a transitional state during which a gaseous lubricating film is formed. The conception for the description of the rotor support characteristics was implemented in a computer program that is still under development. The approach that has been taken makes it possible to analyse the system properties throughout a whole range of rotational speeds. Another approach used in the past enabled for analyses of the dynamic performance of rotors, but only on the condition that bearing operation is correct (i.e. only fluid friction in bearing is present). The new model allows for much broader analyses of bearings operation, as confirmed by the obtained results. The article discusses exemplary results of analyses and shows a way one can assess the dynamic properties of rotating machinery equipped with foil bearings even when analysed under transient operating conditions.<br/><br/>
Authors and Affiliations
Grzegorz ŻYWICA, Małgorzata BOGULICZ, Paweł BAGIŃSKI
Keywords
Related Articles
- EP ID EP240862
- DOI 10.5604/01.3001.0010.6345
- Views 63
- Downloads 0
Wpływ geometrii szczeliny smarowej na nośność łożyska z czopem ze śrubowym rowkiem
Celem zaprezentowanych w artykule analiz było określenie wpływu śrubowego rowka na czopie na nośność poprzecznego łożyska ślizgowego. W efekcie przeprowadzonych badań zaproponowano dwa wskaźniki, za pomocą których można...
Optymalizacja zawartości dodatków smarnych w modelowych kompozycjach smarowych
THE EFFECT OF ELECTRON BEAM IRRADIATION ON TRIBOLOGICAL CHARACTERISTICS OF PTFE, POM, AND PA IN COMBINATION WITH AN ANODIC-OXIDE COATINGS
In this paper, the authors present the results of tribological and stereometric tests as well as the results of surface morphology of polytetrafluoroethylene, polyoxymethylene, and polyamide subjected to modification wit...
THE INFLUENCE OF TANGENTIAL STIFFNESS OF THE CONTACT ON FRICTION FORCE IN THE PRESENCE OF LONGITUDINAL TANGENTIAL VIBRATION
The results of the numerical analysis of the contact tangential stiffness effect on the friction forces runs in the presence of longitudinal tangential contact vibrations are presented in this paper. In addition, the exp...
Rozważania o rozrzucie powierzchniowej trwałości zmęczeniowej w świetle aktualnych teorii
Praktyka badawcza i eksploatacyjna pokazuje, że cechą charakterystyczną łożysk tocznych jest m.in. ogromny rozrzut ich powierzchniowej trwałości zmęczeniowej. Na rozrzut ten wpływają zarówno warunki eksploatacji łożysk,...