Steady motions of a rigid unbalanced rotor in non-linear elastic bearings

Steady motions of a dynamically and statically unbalanced rotor, mounted in elastic bearings with cubic non-linearity, are considered, assuming the presence of resistance forces of a varying nature and that the rotor possesses four degrees of freedom. The possible types of steady motions are analysed, the conditions for the onset of self-excited vibrations are obtained and the basic characteristics of self-excited vibration modes derived. (C) 2002 Elsevier Science Ltd. All rights reserved.