The effects of three-dimensional irregularities on the performance characteristics of turbulent journal bearing
TL;DR: In this article, the authors present an analysis of the performance characteristics of a journal bearing with three-dimensional asperities operating in a turbulent regime, based on the linearized lubrication theory.
About: This article is published in Wear.The article was published on 1996-08-01. It has received 14 citations till now. The article focuses on the topics: Bearing (mechanical) & Lubrication theory.
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TL;DR: In this paper, a nonlinear supported model is proposed for rotor-bearing system, where a linear damping, a non-linear elastic restoring force and a turbulent lubricant flow model are assumed.
Abstract: For a more precise description of rotor–bearing system, a nonlinear supported model is proposed in this paper, where a linear damping, a nonlinear elastic restoring force and a turbulent lubricant flow model are assumed. The dynamics of the rotor center and bearing center are studied. The spatial displacements in the horizontal and vertical directions are considered for various non-dimensional speed ratios. The dynamic equations are solved using the Runge–Kutta method. The analysis methods employed in this study is inclusive of the dynamic trajectories of the rotor center and bearing center, Poincare maps and bifurcation diagrams. The maximum Lyapunov exponent analysis is also used to identify the onset of chaotic motion. The numerical results show that the stability of the system varies with the non-dimensional speed ratios. Specifically, it is found that the dynamic behaviors of the system include 2T-periodic, quasi-periodic and chaotic motions. The modeling results thus obtained by using the method proposed in this paper can be employed to predict the stability of the rotor–bearing system and the undesirable behavior of the rotor and bearing center can be avoided.
52 citations
01 Jun 2006
TL;DR: In this paper, the authors present a dynamic analysis of a rotor supported by two turbulent model journal bearings with non-linear suspension, where the dynamics of the rotor center and bearing center are studied.
Abstract: This study presents a dynamic analysis of a rotor supported by two turbulent model journal bearings with non-linear suspension. The dynamics of the rotor centre and bearing centre are studied. The analysis of the rotor-bearing system is investigated under the assumptions of turbulent lubricant flow and a short bearing approximation. The spatial displacements in the horizontal and vertical directions are considered for various non-dimensional speed ratios. The dynamic equations are solved using the fourth-order Runge-Kutta method. The analysis methods employed in this study is inclusive of the dynamic trajectories of the rotor centre and bearing centre, power spectra, Poincare maps, and bifurcation diagrams. The maximum Lyapunov exponent analysis is also used to identify the onset of chaotic motion. The numerical results show that the stability of the system varies with the non-dimensional speed ratios. Specifically, it is found that the dynamic behaviours of the system include 3T-periodic, jump ph...
35 citations
TL;DR: In this article, 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 was investigated.
Abstract: 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, Poincare 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.
25 citations
TL;DR: In this article, the authors performed a systematic analysis of the dynamic behavior of a gear-bearing system with the turbulent flow effect, nonlinear suspension and nonlinear oil-film force.
20 citations
Cites background from "The effects of three-dimensional ir..."
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...Lin [24] investigated the turbulent hydrodynamic lubrication associated with the lubrication of three-dimensional surface irregularity....
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TL;DR: In this article, the stochastic turbulent lubrication models of one-dimensional longitudinal rough surface, transverse rough surface and isotropic rough surface were derived for journal bearing and thrust bearing, and the results were in good agreement with the corresponding experimental data.
20 citations
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TL;DR: In this article, a numerical procedure to predict the effects of gaseous cavitation in moderately to heavily loaded bearings is developed, which is an outgrowth of the Elrod algorithm which is simple to use and automatically implements cavitation boundary conditions at film rupture and reformation.
Abstract: A numerical procedure to predict the effects of gaseous cavitation in moderately to heavily loaded bearings is developed. The method is an outgrowth of the Elrod algorithm which is simple to use and which automatically implements cavitation boundary conditions at film rupture and reformation. The current procedure makes use of type differencing in the shear induced flow formulation to automatically switch from central to upwind differences, and vice versa, at cavitation boundaries. Comparison is made with the results obtained using Elrod's algorithm for various test cases involving both slider and journal bearings. Presented at the 43rd Annual Meeting in Cleveland, Ohio May 9–12, 1988
197 citations