Vibration analysis of a rotordynamic system with nonlinear bearing supports

Wei Dai, Jian Yang

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

This paper investigates the dynamic behaviour of a rotordynamic system incorporating stiffness nonlinearity in the supporting bearings. The system model comprises a horizontal Jeffcott rotor mounted on symmetrically located ball bearings. The nonlinear radial stiffness of the bearing is estimated based on the Hertzian contact theory. The harmonic balance approximations and the time-marching method are applied to solve the governing equations and determine the steady-state dynamic response. The results show that a small nonlinear bearing stiffness provides benefits for the suppression of response in the high frequency range. A large damping coefficient in the bearing can reduce the peak response amplitude. A combination of a small bearing stiffness and a large bearing damping can assist in effective vibration suppression from rotor in a broad excitation frequency range. These results lead to a better understanding of the effects of stiffness nonlinearity and damping property of the bearing on the vibration behaviour of rotordynamic system and hence benefit enhanced designs with desirable dynamic characteristics

Original languageEnglish
Title of host publicationProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
PublisherCanadian Acoustical Association
ISBN (Electronic)9781999181000
Publication statusPublished - 2019
Event26th International Congress on Sound and Vibration, ICSV 2019 - Montreal, Canada
Duration: 7 Jul 201911 Jul 2019

Publication series

NameProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019

Conference

Conference26th International Congress on Sound and Vibration, ICSV 2019
Country/TerritoryCanada
CityMontreal
Period7/07/1911/07/19

Keywords

  • Harmonic balance method
  • Nonlinear bearing
  • Nonlinear stiffness
  • Rotordynamics

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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