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International Journal of Rotating Machinery
Volume 3 (1997), Issue 3, Pages 199-213

Instability Threshold of a Rigid Rotor-Tilting Pad Journal Bearings System

1Dipartimento di Ingegneria Meccanica per l'Energetica, Università di Napoli “Federico II”, Italy
2Dipartimento di Ingegneria Meccanica, Università di Salerno, Italy

Received 18 July 1996; Revised 18 July 1996

Copyright © 1997 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The stability of a rigid rotor supported on radial tilting pad journal bearings is analysed. This study has been tackled both for small unbalance values by linearising the equations of motion, and also in the case where, because of the high unbalance value, the rotor axis describes orbits with an amplitude such that the system's non-linearity cannot be ignored. In both cases the system's stable operation maps have been obtained and verified through numerical integration of the differential equations of motion.