Numerical study of some nonlinear dynamics of a rotor supported on a three-pad tilting pad journal bearing (TPJB)

Issam Abu-Mahfouz, Maurice L. Adams

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The use of tilting pad journal bearings (TPJBs) has increased in the recent past due to their stabilizing effects on the rotor bearing system. However, in this paper two mechanisms capable of producing instabilities in terms of subharmonic and chaotic motions are suggested. The first one is that of a centrally loaded pad with rotor unbalance excitations. The second one represents a concentric rotor (or a vertical rotor) acted upon by centering sprigs and large unbalance excitations. Extensive numerical experimentation shows, for certain parameters, subharmonic, quasi-periodic, and chaotic motions. The pad state space trajectory, in many cases, resembles that of the two-well potential case as in Duffing's oscillator. Time trajectories, Poincare maps, fast Fourier transform (FFT) plots, and the max Lyapunov exponent are utilized to examine the periodicity (order) of the nonsynchronous rotor orbits and pad trajectories. The TPJB problem belongs to a family of nonlinear rotor-dynamical phenomena that are potentially of a considerable value as diagnostic tools in assessing rotating machinery condition monitoring.

Original languageEnglish (US)
Pages (from-to)262-272
Number of pages11
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume127
Issue number3
DOIs
StatePublished - Jun 1 2005

Fingerprint

Bearing pads
journal bearings
Journal bearings
rotors
Rotors
Trajectories
trajectories
Bearings (structural)
Rotating machinery
machinery
experimentation
Condition monitoring
Fast Fourier transforms
excitation
periodic variations
Orbits
plots
oscillators
exponents
orbits

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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