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A Case Study of the Contact Force and Stress in the Backup Bearing of a Generator: Experimental Study and Numerical Simulation of Dropdown

Publication Details
Authors: Neisi Neda, Ghalamchi Behnam, Heikkinen Janne, Sillanpää Teemu, Hartikainen Toni, Sopanen Jussi
Publication year: 2019
Language: English
Related Journal or Series Information: Mechanisms and Machine Science
Title of parent publication: IFToMM 2018: Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM
Volume number: 62
Start page: 374
End page: 386
Number of pages: 13
ISSN: 2211-0984
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication


This paper presents both experimental and numerical study on the
dropdown of a generator rotor in a two-stage radial gas turbine
utilizing AMB system. The simulation unifies the FE-model of the
flexible rotor and the dynamic model of backup bearings. The system
under investigation includes a flexible rotor, an axial and two radial
AMBs and two backup bearings, double row angular contact ball bearings.
The recorded behavior of the studied rotor in the sudden failure of the
electromagnetic field is demonstrated. Furthermore, the fine-tuned
rotor-system model is used for studying the contact force and the
contact stress in the backup bearing. The comparison between the
measured results and the simulated results confirms that the used
simulation tool can be applied for the design consideration of
rotor-backup bearing system and enables to investigate the effect of
various design parameters on the dynamic behavior of rotor in the

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Last updated on 2020-20-03 at 10:03