A1 Journal article (refereed), original research

Simulation of Subcritical Vibrations of a Large Flexible Rotor with Varying Spherical Roller Bearing Clearance and Roundness Profiles


Open Access publication

Publication Details
Authors: Kurvinen Emil, Viitala Raine, Choudhury Tuhin, Heikkinen Janne, Sopanen Jussi
Publisher: MDPI
Publication year: 2020
Language: English
Related Journal or Series Information: Machines
Volume number: 8
Issue number: 2
ISSN: 2075-1702
eISSN: 2075-1702
JUFO-Level of this publication: 1
Open Access: Open Access publication

Abstract

In large rotor-bearing systems, the rolling element bearings act as a
considerable source of subcritical vibration excitation. Simulation of
such rotor bearing systems contains major sources of uncertainty
contributing to the excitation, namely the roundness profile of the
bearing inner ring and the clearance of the bearing. In the present
study, a simulation approach was prepared to investigate carefully the
effect of varying roundness profile and clearance on the subcritical
vibration excitation. The FEM-based rotor-bearing system simulation
model included a detailed description of the bearings and asymmetricity
of the rotor. The simulation results were compared to measured responses
for validation. The results suggest that the simulation model was able
to capture the response of the rotor within a reasonable accuracy
compared to the measured responses. The bearing clearance was observed
to have a major effect on the subcritical resonance response amplitudes.
In addition, the simulation model confirmed that the resonances of the
3rd and 4th harmonic vibration components in addition to the well-known
2nd harmonic resonance (half-critical resonance) can be significantly
high and should thus be taken into account already in the design phase
of large subcritical rotors.


Last updated on 2020-10-08 at 10:11

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