Numerical investigation of subsynchronous vibration in floating ring bearings

Wang, Yan; Ren, Xiaodong; Li, Xuesong; Gu, Chen

doi:10.1177/1350650117753915

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…Obviously, the static and dynamic characteristics of the bubbly oil lubrication bearing will be influenced by factors such as the void fraction. Therefore, the new bubbly oil lubrication technology has been concerned and studied by researchers and found that shaft vibration can be suppressed, frictional power consumption is reduced [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

A lubrication model and static characteristics analysis for bubbly oil lubricated journal bearings based on theory of multiphase mixtures

Li,

Jiang,

Lin

2023

J. Phys.: Conf. Ser.

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A bubbly oil lubrication model is established in this paper. Interface effect is included in this new model. Two single-component coupled nonlinear generalized Reynolds-type equations are derived based on the theory of multiphase-mixture flow and the second law of thermodynamics. The static characteristics of the finite journal bearings with bubbly oil lubrication are predicted using this theoretical model. The results show that the friction torque is significantly reduced compared to pure oil lubrication at a higher initial bubble volume fraction, and the sidle leakage are significantly increased compared to pure oil lubrication.

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Section: Introductionmentioning

confidence: 99%

A lubrication model and static characteristics analysis for bubbly oil lubricated journal bearings based on theory of multiphase mixtures

Li,

Jiang,

Lin

2023

J. Phys.: Conf. Ser.

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“…Wang et al. 12 constructed a computational fluid dynamics (CFD) calculation method to predict the performance of floating ring bearings and validate the air entrainment effect. Vibration characteristics are investigated through the transit CFD calculation with the mesh motion method using discrete Fourier transform analysis.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear stability analysis and numerical continuation of bifurcations of a rotor supported by floating ring bearings

Amamou

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Floating ring bearings have been widely used, over the last decades, in rotors of automotive turbochargers because of their improved damping behavior and their good emergency-operating capabilities. They also offer a cost-effective design and have good assembly properties. Nevertheless, rotors with floating ring bearings show vibration effects of nonlinear nature induced by self-excited oscillations originating from the bearing oil films (oil whirl/whip phenomena) and may exhibit various nonlinear vibration effects which may cause damage to the rotor. In order to investigate these dynamic phenomena, this paper has developed a nonlinear model of a perfectly balanced rigid rotor supported by two identical floating ring bearings with consideration of their vibration behavior mainly governed by fluid dynamics. The dimensionless hydrodynamic forces of floating ring bearings have been derived based on the short bearing theory and the half Sommerfeld solution. Using the numerical continuation approach, different bifurcations are detected when a control parameter, the journal speed, is varied. Depending on the system’s physical parameters, the rotor can show stable or unstable limit cycles which themselves may collapse beyond a certain rotor speed to exhibit a fold bifurcation. Bifurcation analysis is performed to investigate the occurring instabilities and nonlinear phenomena. Such results explain the instabilities characteristics of the floating ring bearing in high-speed applications. It has also been found that the selection of the bearing modulus plays an important role in the characterization of the rotor stability threshold speed and bifurcation sequences. An understanding of the system’s nonlinear behavior serves as the basis for new and rational criteria for the design and the safe operation of rotating machines.

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“…Aerostatic bearings are widely employed in gas turbines, grinding machines, and high-precision positioning systems due to the properties of low friction, low heat conduction, environmentally friendly operation, and long life. 1–5 The static performance of aerostatic bearings is a significant aspect of its application. Their performance is significantly affected by many factors such as machining tolerances, 6 configuration structure, 7,8 feed system type, 9–13 bearing geometrical and operational parameters, 14–18 and grooves.…”

Section: Introductionmentioning

confidence: 99%

Static performance of the aerostatic journal bearing with grooves

Chen

Mills

Bao

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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Aerostatic bearings are widely employed in precision machines due to their properties of low friction, low heat conduction, and long-life operation. In this work, static performance of the journal bearing with rectangular grooves is investigated numerically. The effect of geometrical parameters such as axial groove length [Formula: see text], circumferential groove length [Formula: see text], orifice diameter df, groove depth gh, misalignment angles [Formula: see text] and [Formula: see text] on the load capacity [Formula: see text], stiffness [Formula: see text], and gas flow rate [Formula: see text] are analyzed systematically. The resistance network method (RNM) is utilized to solve the Reynolds equation required in the analysis. Performance parameters including pressure distribution P, load force [Formula: see text], stiffness [Formula: see text], and gas flow rate [Formula: see text] are examined in the simulations. It is revealed from the simulations that the proper value of axial groove length [Formula: see text] to obtain a better static performance varies from 1/8 to 1/2 when df varies between 0.11 and 0.29 mm, respectively. Therefore, a larger load force and stiffness can be obtained if [Formula: see text] is chosen to be 1/4, when diameter of the bearing orifice df equals 0.17 mm. It is also suggested that [Formula: see text] be chosen from the range of 1/6 and 1/3 to obtain a better static performance and a smaller gas flow rate. [Formula: see text] decreases with an increase in df when [Formula: see text] is set to be 1/8. However, the load force [Formula: see text] increases with an increase in df when [Formula: see text] varies from 3/8 to 1/2. [Formula: see text] has a significant influence on the changes of [Formula: see text] with df when [Formula: see text] is set to be constant. Therefore, df should be selected according to [Formula: see text] for an optimal design. The increase of misalignment angle [Formula: see text] leads to an increase in the load force [Formula: see text]. [Formula: see text] has little influence on the load force [Formula: see text]. Misalignment angles [Formula: see text] and [Formula: see text] have little influence on stiffness [Formula: see text] and gas flow rate [Formula: see text]. Therefore, it is preferable if [Formula: see text] is larger than 0 rad.

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Numerical investigation of subsynchronous vibration in floating ring bearings

Cited by 7 publications

References 34 publications

A lubrication model and static characteristics analysis for bubbly oil lubricated journal bearings based on theory of multiphase mixtures

A lubrication model and static characteristics analysis for bubbly oil lubricated journal bearings based on theory of multiphase mixtures

Nonlinear stability analysis and numerical continuation of bifurcations of a rotor supported by floating ring bearings

Static performance of the aerostatic journal bearing with grooves

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