Experimental analysis of a rigid rotor supported on aerodynamic foil journal bearings
1 Institut Pprime, UPR CNRS 3346, Université de Poitiers, France
2 ENSMA ISAE Poitiers, France
Aerodynamic foil bearings are highly non linear components used or intending to be used for supporting high speed rotors (>30 krpm) of low size rotating machines (<400 kW). The non linear character comes from the highly deformable structure of the bearing made of thin steel sheets and from the Coulomb friction forces arising during dynamic displacements. The present work shows the non linear response of a rigid rotor supported by a pair of such bearings and entrained at 82 krpm. The measurements performed during the coast down revealed sub synchronous and asynchronous vibrations of the rotor and their multiples. A simplified theoretical model reproduces qualitatively some of these non linear characteristics.
© Owned by the authors, published by EDP Sciences, 2014
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