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International Journal of Rotating Machinery
Volume 2008 (2008), Article ID 147653, 9 pages
http://dx.doi.org/10.1155/2008/147653
Research Article

Response of a Warped Flexible Rotor with a Fluid Bearing

Department of Mechanical Engineering, California Polytechnic State University, San Luis Obispo, CA 93407, USA

Received 21 June 2007; Revised 30 January 2008; Accepted 31 March 2008

Academic Editor: Agnes Muszynska

Copyright © 2008 Jim Meagher et al. 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.

Abstract

A two-complex-degrees-of-freedom model is developed and compared to experimental data for various amounts of rotor bow and its orientation to mass imbalance of the rotor. The equation of motion is developed by adding constant forces that rotate with the rotor to a Bently-Muszynska two-mode isotropic rotor model with a plane journal bearing. Diagnostic information discernable from probes at the bearing is explored and compared to midspan response, where previous research has concentrated. The model presented also extends earlier work by representing the effect of a nonrigid bearing. Good agreement between the analytical model and experiment demonstrates that the analysis presented can be useful to diagnose and balance residual shaft bow from probes located at the bearings, where vibration data are typically more available than midspan probes.