Effect of bearing number on non-linear dynamic behaviour of aerodynamic non-circular journal bearing systems

Abstract The present article presents the effect of bearing number on non-linear dynamic behaviour of a rigid rotor supported by aerodynamic non-circular journal bearings. A finite-element method has been employed to solve the Reynolds equation in static and dynamical states and the dynamical equati...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part J, Journal of engineering tribology Journal of engineering tribology, 2010-02, Vol.224 (2), p.139-156
Main Authors: Rashidi, R, Mohammadi, Karami A, Bakhtiari-Nejad, F
Format: Article
Language:English
Subjects:
Aerodynamics
Bearing
Bifurcations
Circularity
Dynamic tests
Dynamical systems
Dynamics
Effects
Finite element method
Journal bearings
Mathematical analysis
Mechanical engineering
Nonlinear dynamics
Poincare maps
Power spectra
Reynolds equation
Rotors
Runge-Kutta method
Trajectories
Tribology
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Summary:Abstract The present article presents the effect of bearing number on non-linear dynamic behaviour of a rigid rotor supported by aerodynamic non-circular journal bearings. A finite-element method has been employed to solve the Reynolds equation in static and dynamical states and the dynamical equations are solved using the Runge-Kutta method. To analyse the behaviour of the rotor centre in the horizontal and vertical directions under different operating conditions, dynamic trajectory, power spectra, Poincare maps, and bifurcation diagrams are used. The results of this study reveal how the complex dynamic behaviour of these three types of non-circular bearing systems comprising periodic and KT-periodic responses of the rotor centre varies with changes in bearing number values.
ISSN:1350-6501
2041-305X
DOI:10.1243/13506501JET645