0
research-article

Nonlinear Dynamics of Flexible Rotors Supported on Journal Bearings - Part 1: Analytical Bearing Model

[+] Author and Article Information
Mohammad Miraskari

Mechanical Engineering Department, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada
m.miraskari@alumni.ubc.ca

Farzad Hemmati

Mechanical Engineering Department, University of British Columbia
farhemmati@alumni.ubc.ca

Mohamed S. Gadala

Mechanical Engineering Department, University of British Columbia, and Abu Dhabi University, Abu Dhabi, UAE
gadala@mech.ubc.ca

1Corresponding author.

ASME doi:10.1115/1.4037730 History: Received November 25, 2016; Revised August 14, 2017

Abstract

To determine the bifurcation types in a rotor-bearing system, it is required to find higher order derivatives of the bearing forces with respect to journal velocity and position. As closed-form expressions for journal bearing force is not generally available, Hopf bifurcation studies of rotor-bearing systems have been limited to simple geometries and cavitation models. To solve this problem, an alternative nonlinear coefficient-based method for representing the bearing force is presented in this study. A flexible rotor-bearing system is presented for which bearing force is modeled with linear and nonlinear dynamic coefficients. The proposed nonlinear coefficient-based model was found to be successful in predicting the bifurcation types of the system as well as predicting the system dynamics and trajectories at spin speeds below and above the threshold speed of instability.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In