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International Journal of Rotating Machinery
Volume 2007 (2007), Article ID 75762, 12 pages
Research Article

Experimental and Numerical Investigations of a Dual-Shaft Test Rig with Intershaft Bearing

1Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, Equipe dynamique des Structures et des Systèmes, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, Ecully Cedex 69134, France
2Applied Mechanics Department, Bauman Moscow State Technical University, 2nd Baumanskaya Street, 5, Moscow 107005, Russia

Received 26 June 2006; Revised 17 October 2006; Accepted 30 January 2007

Academic Editor: David P. Fleming

Copyright © 2007 M. Guskov 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.


This paper deals with an experimental study of a dual rotor test rig. This machine, which was developed and built at the Laboratoire de Tribologie et Dynamique des Systèmes, Ecole Centrale de Lyon, will be first presented. It is composed of two coaxial shafts that are connected by an intershaft bearing and rotate independently, each one driven by its own motor. Their lateral vibrations and whirling motion are coupled by the intershaft bearing. The experimental tests consisting in run-ups and the associated measured unbalance response of the dual rotor will be investigated. The influence of the rotation of each rotor on the critical speeds and the associated amplitudes will be discussed. Moreover, this paper presents a numerical model of the dual rotor. Correlations between the experimental and numerical tests will be investigated. The objective is to be able to predict phenomena observed in experiments, starting from a rather fine numerical model.