Identification of nonlinear dynamic coefficients in plain journal bearings

Meruane, Viviana; Pascual, Rodrigo

doi:10.1016/j.triboint.2008.01.002

Cited by 75 publications

(41 citation statements)

References 14 publications

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“…Their results are in good agreement with analytical linearized coefficients. Meruane and Pascual [5] estimated the linear and nonlinear bearing coefficients under large orbital motion and even during oil whirl. They showed that the linearized analytical coefficients agree reasonably with linear coefficients estimated numerically considering a nonlinear model and under large orbital motion.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of short and long journal bearings in laminar and turbulent regimes, application in critical shaft stiffness determination

Hemmati

Miraskari

Gadala

2017

Applied Mathematical Modelling

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Linear and nonlinear stability analysis Hopf bifurcation theory Short and long journal bearings Constantinescu's and Ng −Pan −Elrod turbulent models Critical shaft stiffness a b s t r a c t Linear and non-linear stability of a flexible rotor-bearing system supported on short and long journal bearings is studied for both laminar and turbulent operating conditions. The turbulent pressure distribution and forces are calculated analytically from the modified Reynolds equation based on two turbulent models; Constantinescu's and Ng-Pan-Elrod. Hopf bifurcation theory was utilized to estimate the local stability of periodic solutions near bifurcating operating points. The shaft stiffness was found to play an important role in bifurcating regions on the stable boundaries. It was found that for shafts supported on short journal bearings with shaft stiffness above a critical value, the dangerous subcritical region can be eliminated from a range of operating conditions with high static load. The results presented have been verified by published results in the open literature.

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Section: Introductionmentioning

confidence: 99%

Dynamic analysis of short and long journal bearings in laminar and turbulent regimes, application in critical shaft stiffness determination

Hemmati

Miraskari

Gadala

2017

Applied Mathematical Modelling

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“…But compared with the oil film, the low dynamic viscosity forms the low carrying capacity and it is difficult to form the hydrodynamic lubrication in complex lubrication condition. Though there is some progress in the research of lubrication mechanism, the water-lubricated bearing is treated as the independent research object, and most are theoretical [1][2][3][4][5][6][7][8][9] and simulation analysis [10][11][12][13][14][15]; there are few researches for the water-lubricated bearing and rotor system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of Journal Orbit for Water-Lubricated Bearing

Wang

Zhang

et al. 2016

Mathematical Problems in Engineering

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To study the transient dynamic characteristics of water-lubricated bearing-rotor system in seawater desalination high pressure pump, the water-lubricated bearing test device was designed and built based on the prototype of high pressure pump with 4-stage rotors. The test was conducted to study the journal orbit and circumferential pressure distribution of journal bearing. The result shows that, in startup stage, the journal whirled with little amplitude in low revolution speed, and as the revolution speed increased, the journal began to move irregularly. The hydrodynamic lubrication formed basically when close to the rated revolution speed, and there is stable whirling center and amplitude of the journal orbit. The circumferential pressure distribution of journal bearing changed severely and kept consistent with the change of journal orbit; when the revolution speed reached the rated speed, the pressure distribution is stable. We changed the radius clearance, the aspect ratio, and the rotating speed to analyze the influence on the bearing-rotor system at steady speed. In conclusion, the journal orbit and circumferential pressure of journal bearing are very stable when the clearance radius is 0.05 mm, the aspect ratio is 1, and the revolution speed is 3000 r/min.

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“…Gertzos et al [10] adopted FLUENT to analyze the characteristic of the journal lubricated by the Bingham fluid and compared the numerical simulation result with the experimental result. Meruane and Pascual [11] obtained the free response in different rotating speed based on the bearing-rotor system built by the ADINA. The pressure distribution was compared with the expressions for short bearing, long bearing, and their harmonic combination.…”

Section: Introductionmentioning

confidence: 99%

The Dynamic Characteristic Analysis of the Water Lubricated Bearing-Rotor System in Seawater Desalination Pump

Wang

Zhang

et al. 2014

Advances in Mechanical Engineering

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In order to study the water lubricated bearing-rotor system in seawater desalination pump, this paper is based on the coupling between the lubricating flow field and the rotor dynamics. The fluid-solid interaction (FSI) method, Rigid Body, was adopted to study the journal orbit of the bearing-rotor system under the periodic unbalancing load. The influences of geometric and working parameter to the journal orbit were combined to analyze the stability and reliability of the bearing-rotor system. The result shows that increasing the rotating speed would increase the journal whirling amplitude and the system sensitivity to the external excitation and unbalancing load were promoted; increasing the aspect ratio would reduce the journal whirling amplitude and cause the system to be more unstable; increasing the inlet pressure would reduce the journal whirling amplitude and cause the system to be more unstable; increasing the unbalancing load would reduce the stability margin and the system is easy to be unstable if obstructed; increasing the radial clearance would reduce the journal whirling amplitude and cause the system to be more unstable. The attitude angle has no influence on the journal whirling amplitude but would influence the stability of system and the value of attitude angle should not be large.

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Identification of nonlinear dynamic coefficients in plain journal bearings

Cited by 75 publications

References 14 publications

Dynamic analysis of short and long journal bearings in laminar and turbulent regimes, application in critical shaft stiffness determination

Dynamic analysis of short and long journal bearings in laminar and turbulent regimes, application in critical shaft stiffness determination

Experimental Research of Journal Orbit for Water-Lubricated Bearing

The Dynamic Characteristic Analysis of the Water Lubricated Bearing-Rotor System in Seawater Desalination Pump

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