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

Emil Kurvinen*, Raine Viitala, Tuhin Choudhury, Janne Heikkinen, Jussi Sopanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
24 Downloads (Pure)

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.

Original languageEnglish
Article number28
Number of pages22
JournalMachines
Volume8
Issue number2
DOIs
Publication statusPublished - Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • dynamic simulation
  • dynamic run-out
  • low-order bearing waviness
  • rotor dynamics
  • spherical roller bearings
  • subcritical vibrations
  • LOADED BALL-BEARINGS
  • DYNAMIC-MODEL
  • SURFACE WAVINESS
  • DISTRIBUTED DEFECTS
  • TOUCHDOWN BEARING
  • ROLLING SURFACES
  • TUBE ROLL
  • SYSTEM

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