Journal
NONLINEAR DYNAMICS
Volume 56, Issue 3, Pages 297-314Publisher
SPRINGER
DOI: 10.1007/s11071-008-9400-0
Keywords
Turbulent journal bearing; Bifurcation; Chaos; Couple stress fluid; Rub-impact; Quadratic damping
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This work reports a numerical study undertaken to investigate the dynamic response of a rotor supported by two turbulent flow model journal bearings with nonlinear suspension and lubricated with couple stress fluid under quadratic damping. This may be the first time that analysis of rotor-bearing system considered the quadratic damping effect. The dynamic response of the rotor center and bearing center are studied. The analysis methods employed in this study are inclusive of the dynamic trajectories of the rotor center and bearing center, power spectra, Poincar, maps and bifurcation diagrams. The maximum Lyapunov exponent analysis is also used to identify the onset of chaotic motion. The modeling results provide some useful insights into the design and development of rotor-bearing system for rotating machinery that operates at highly rotational speed and highly nonlinear regimes.
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