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
Numerical analysis of the effect of backpull on tool wear in the process of wire drawing
Badania eksploatacyjne odporności na ścieranie blach wykładzinowych stosowanych w kole czerpakowym koparki typu SRs 1200
Porównano odporność na ścieranie blach tworzących zsuwnię wirującą koła czerpakowego koparki pracującej w kopalni węgla brunatnego. Badano sześć rodzajów blach, w tym trzech napawanych, które zostały za montowane na tym...
Combined study of wear phenomena using steel wheel abrasion test
Tribochemiczna modyfikacja warstwy wierzchniej polimeru w kontakcie ślizgowym z żelazem Armco
Badano stopień tribochemicznej modyfikacji powierzchni współpracujących w ślizgowym kontakcie ciernym polimer–metal pod kątem obecności jonów metalu przeniesionych do przeciwpróbki. Metodami ToF-SIMS, RBS oraz SEM-EDS po...
ANALYSIS OF THE STRUCTURE AND TRIBOLOGICAL PROPERTIES OF SINTERED STAINLESS STEELS
Increasing development of civilization encourages the search for modern engineering materials. At present, very interesting and promising materials are sintered stainless steels that are considered to be the most rapidly...