Nonlinear dynamic of flexible rotor supported by turbulent bearings with quadratic damping and temperature dependent viscosity

A nonlinear dynamic model of a rotor supported by the turbulent journal bearing with quadratic damping under nonlinear suspension is presented in this study, and the lubricating oil is assumed to be temperature-dependent. The bifurcation diagrams, dynamic trajectories, power spectra, Poincaré map, L...

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Bibliographic Details
Published in:Advances in mechanical engineering 2024-11, Vol.16 (11)
Main Authors: Chang-Jian, Cai-Wan, Chu, Li-Ming, Chen, Tsung-Chia
Format: Article
Language:English
Subjects:
Bifurcations
Chaos theory
Damping
Dynamic characteristics
Dynamic models
Dynamical systems
Error analysis
Fluid flow
Fractal geometry
Journal bearings
Liapunov exponents
Lubricants
Lubricating oils
Nonlinear dynamics
Nonlinear systems
Poincare maps
Power spectra
Rotating fluids
Rotating machinery
Rotor-bearing systems
Rotors
Temperature dependence
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Summary:A nonlinear dynamic model of a rotor supported by the turbulent journal bearing with quadratic damping under nonlinear suspension is presented in this study, and the lubricating oil is assumed to be temperature-dependent. The bifurcation diagrams, dynamic trajectories, power spectra, Poincaré map, Lyapunov exponent, and fractal dimension are used to verify the dynamic characteristics of the rotor-bearing system, and abundant subharmonic, and even chaotic motions are found. Temperature is one of the key parameters affecting the dynamic responses of the system, and the dynamic responses will perform non-periodic or even chaotic motions with higher working temperatures of lubricant fluid, as proved in this study. Nonlinear dynamic simulation analysis results will help engineers avoid unnecessary trial and error when designing and applying rotating machinery systems.
ISSN:1687-8132
1687-8140
DOI:10.1177/16878132241293957