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Mechanism of Occurrence of Self-Excited Oscillations of a Rotor With a Clearance Between Bearing Holder and Housing

[+] Author Affiliations
Mizuho Inagaki

Toyota Central R&D Laboratory, Inc., Nagakute, Aichi, Japan

Yukio Ishida

Nagoya University, Nagoya, Aichi, Japan

Paper No. DETC2011-48052, pp. 965-974; 10 pages
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5478-5
  • Copyright © 2011 by ASME


It is well known that, in a rotor system with a radial clearance between a rotating part (ex. shaft) and a static part (ex. guide), a forward rubbing with the same angular speed as the rotational speed ω, a backward rubbing with an angular speed proportional to ω, and various kinds of nonlinear resonances occur. On the contrary, some rotor systems have a clearance between a movable but non-rotating part and a static part. For example, a squeeze-film damper bearing has a clearance between a bearing holder and housing. In such a system, a self-excited oscillation occurs in addition to various kinds of nonlinear resonances. In this paper, the characteristics of this self-excited oscillation are investigated and the mechanism of the occurrence of a self-excited oscillation is clarified by considering energy balance.

Copyright © 2011 by ASME



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