A velocity-slip model for analysis of the fluid film in the cavitation region of a journal bearing

Cheng, Feng; Ji, Weixi

doi:10.1016/j.triboint.2016.01.025

Cited by 29 publications

(20 citation statements)

References 33 publications

(43 reference statements)

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“…In the condition of turbulent lubrication, the Reynolds equation 9,25 for a transiently loaded journal bearing may be written as in the following form…”

Section: The Turbulent Lubrication Model Considering Velocity Slip Inmentioning

confidence: 99%

“…The velocity slip in the cavitation region can occur and change the cavitation boundary condition of oil film and affects the dynamic behaviors of the journal bearing. 8,9 Therefore, the velocity slip in the cavitation region plays an important role in solving the dynamic coefficients of the journal bearing and also influences the dynamic performance of a rotor-bearing system.…”

Section: Introductionmentioning

confidence: 99%

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Identification of dynamic coefficients of the journal bearing considering velocity slip of cavitation zone in the rotating spindle unit

Cheng

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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A rotating spindle unit, supported by the journal bearings, is developed to improve the cavitation erosion resistance of the journal bearing as well as the spindle dynamic performance. The turbulent lubrication model considering velocity slip in cavitation zone is derived, and the static and dynamic parameters of the journal bearing are obtained. An identification algorithm is further derivated to identify simultaneously the 16 dynamic coefficients of the two journal bearings in the spindle unit. The available experimental results reveal that the journal bearing coefficients are well predicted and estimated by the present model, and the estimated bearing parameters by regularization solution are in good agreement with the assumed values, while it has opposite effect by directed solution for discrete ill-posed problems. It is concluded that the identification accuracy of bearing parameters is governed by the displacement error, and the percentage deviation of dynamic coefficients decreases with the decrease of the displacement error.

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“…In the condition of turbulent lubrication, the Reynolds equation 9,25 for a transiently loaded journal bearing may be written as in the following form…”

Section: The Turbulent Lubrication Model Considering Velocity Slip Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of dynamic coefficients of the journal bearing considering velocity slip of cavitation zone in the rotating spindle unit

Cheng

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Aggarwal et al [8] studied frictional and load-carrying behaviours of micro-textured sector shape pad thrust bearing considering the cavitation and thermal effects. Cheng et al [9] pointed out that the slip velocity of the cavitation zone would affect the oil film pressure, bearing capacity, and dynamic coefficient. Gao et al [10] analyzed the relationship between eccentricity and sommerfeld number of water lubricated bearings using the cavitation model.…”

Section: Introductionmentioning

confidence: 99%

Combined Influence of Noncondensable Gas Mass Fraction and Mathematical Model on Cavitation Performance of Bearing

Wang

Liu

Yuan

et al. 2020

International Journal of Rotating Machinery

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The presence of cavitation in the oil film seriously affects the bearing lubrication performance and bearing capacity. Now the research of this phenomenon mostly focuses on the model of Reynolds equation (R-E equation) or Navier-Stokes equation (N-S), the influence of the two computation models is less analyzed, and the effect of noncondensable gas (NCG) mass fraction on the bearing performance is seldom studied. In the manuscript, the cavitation mechanism is studied using the mixed model of three-dimensional N-S equation and Jakobsson-Floberg-Olsson (JFO) condition of two dimensional Reynolds equation, and the influence of rotational speed and NCG mass fraction on the cavitationoil film pressure, and bearing capacity was studied. The results show that the change trend of cavitation with the rotational speed is basically consistent for N-S equation and R-E equation. The bearing capacity calculated by N-S equation is greater than that calculated by R-E equation. The peak pressure and bearing capacity of film can be improved by increasing the NCG mass fraction of lubricant and rotational speed.

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“…Rohde et al [5] studied the elastic and thermal deformations in a slider bearing, noted that the variations in fluid viscosity with temperature were much more influential than solid deformation due to thermal and elastic effects. Researchers are still interested in the journal bearing where oil or gas is used as lubricants [6,7]. Lu et al [8] conducted a thermal-fluid coupling study on characteristics of air-oil two phase flow and heat transfer in a micro unmanned aerial vehicle (UAV) bearing chamber.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Influence of Temperature on Lubricant Film Characteristics of the Piston/Cylinder Interface in Axial Piston Pumps

Song

Zeng

2018

Energies

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The loss of kinetic energy of moving parts due to viscous friction of lubricant causes the reduction of piston pump efficiency. The viscosity of lubricant film is mainly affected by the thermal effect. In order to improve energy efficiency of piston pump, this research presents a numerical method to analyze the lubricant film characteristics in axial piston pumps, considering the thermal effect by the coupled multi-disciplinary model, which includes the fluid flow field expressed by Reynolds equation, temperature field expressed by energy equation and heat transfer equation, kinematics expressed by the motion equation. The velocity and temperature distributions of the gap flow of piston/cylinder interface in steady state are firstly numerically computed. Then the distributions are validated by the experiment. Finally, by changing the thermal boundary condition, the influence of thermal effect on the lubricant film, the eccentricity and the contact time between the piston and cylinder are analyzed. Results show that with the increase of temperature, the contact time increases in the form of a hyperbolic tangent function, which will reduce the efficiency of the axial piston pump. There is a critical temperature beyond which the contact time will increase rapidly, thus this temperature is the considered as a key point for the temperature design.

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A velocity-slip model for analysis of the fluid film in the cavitation region of a journal bearing

Cited by 29 publications

References 33 publications

Identification of dynamic coefficients of the journal bearing considering velocity slip of cavitation zone in the rotating spindle unit

Identification of dynamic coefficients of the journal bearing considering velocity slip of cavitation zone in the rotating spindle unit

Combined Influence of Noncondensable Gas Mass Fraction and Mathematical Model on Cavitation Performance of Bearing

A Numerical Study on Influence of Temperature on Lubricant Film Characteristics of the Piston/Cylinder Interface in Axial Piston Pumps

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