Determination of stiffness coefficients of hydrodynamic water-lubricated plain journal bearings

Zhang, Xiuli; Zhang, Yin; Gao, Gengyuan; Li, Zheng

doi:10.1016/j.triboint.2014.12.019

Cited by 75 publications

(62 citation statements)

References 26 publications

(30 reference statements)

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“…A coordinate transformation is necessary to move from (O j , R, T) to (O b , X, Y). Equations (17) and (18) summarize the transformation of the stiffness matrix from the (X, Y) to (R, T) and from the (R, T) to (X, Y) reference frames, respectively. Identical transformations also apply to the added mass and damping matrices.…”

Section: Journal Bearingmentioning

confidence: 99%

“…Zhang et al [17] numerically evaluated the dynamic coefficients of a water-lubricated journal bearing based on the steady-state solution of the Navier-Stokes (NS) equations. The CFD model employed ANSYS Fluent to calculate the pressure profiles while taking into consideration both fluid inertia and cavitation through the Zwart cavitation model.…”

Section: Introductionmentioning

confidence: 99%

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A CFD-Based Frequency Response Method Applied in the Determination of Dynamic Coefficients of Hydrodynamic Bearings. Part 1: Theory

Snyder

Braun

2019

Lubricants

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A general, CFD-based frequency response method for obtaining the dynamic coefficients of hydrodynamic bearings is presented. The method is grounded in experimental parameter identification methods and is verified for an extremely long, slider bearing geometry as well as short and long journal bearing geometries. The influence of temporal inertia on the dynamic response of the bearings is discussed and quantified through the inclusion of added mass coefficients within the mechanical models of the hydrodynamic bearing films. Methods to separate the dynamic stiffness into static stiffness and added mass contributions are presented and their results compared. Harmonic perturbations are applied to the bearings at varying frequencies to determine the frequency dependence of the dynamic coefficients and to facilitate the decomposition of the dynamic stiffness into its constituents. Added mass effects are shown to be significant for the extremely long slider bearing geometry and negligible for the short and long journal bearing geometries under operating conditions motivated by those typical of marine bearings.

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Section: Journal Bearingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A CFD-Based Frequency Response Method Applied in the Determination of Dynamic Coefficients of Hydrodynamic Bearings. Part 1: Theory

Snyder

Braun

2019

Lubricants

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“…Marsh and Yantek [12] concluded that the stiffness of ball bearings consisted of four components (stiffness of the rings, rolling bodies and the cage), based on the frequency response function. Similarly, Zhang et al [13] developed an efficient method for the determination of the coefficient of stiffness of plain bearings with hydrodynamic lubrication. A relationship was obtained between the coefficients of stiffness and the bearing load characterized by different radial clearances, different length to diameter ratios and different rotation speeds.…”

Section: Introductionmentioning

confidence: 99%

A Methodology for Analyzing Radial Ball Bearing Vibrations

Soldat

Mitrović

Atanasovska

et al. 2020

TFAMENA

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This paper presents the development of a methodology for calculating radial ball bearing vibrations. First, analytical and numerical models were developed and then, the obtained results were experimentally verified. In the experiment, a test rig for a dynamic testing of bearings subjected to an external load was used. Special attention was paid to the analysis of the total bearing deformations and stiffness, being the main parameters that define the dynamic behaviour of a bearing. In order to determine total deformations of a ball bearing as an assembly, a finite element model of the bearing was developed. The results obtained from the new methodology for a particular ball bearing type have been verified by experimental results. The obtained correlations of the experimental and the numerical results are about 2.5%. Based on the calculations and the experimental testing of the chosen ball bearing type, under conditions of a variable radial load, the analysis of the influence of the radial load on the dynamic behaviour of a ball bearing was performed. The analysis of the obtained results showed that the vibration amplitude increases with a similar multiple factor as loads increase.

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“…To overcome this problem, the cavitation lubricant is treated as two-phase mixed fluid. The two-phase mixed fluid models have been developed, those models can be divided into three types based on calculation approaches of gas phase volume fraction：(1) the model based on the R-P equation [4,5] (2) the model based on gas solubility and surface tension of bubble [4,[6][7][8][9] (3) the model based on transport equation of the gas phase volume fraction [10][11][12][13][14][15]. In addition, with the rapid development of computational fluid dynamics (CFD) technology, some researchers have proposed performance analysis of bearings with the cavitation using the CFD software [7,11,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of High-speed Water-lubricated Spiral Groove Thrust Bearing based on Turbulent Cavitating Flow Lubrication Model

Lin¹,

Wang²,

Jiang³

et al. 2020

Preprint

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In this paper, a turbulent cavitating flow lubrication model based on two-phase fluid and population balance equation of bubbles was established to analyze dynamic characteristics of high speed water-lubricated spiral groove thrust bearings(SGTB). Stiffness and the damping coefficients of the SGTB were calculated using the perturbation pressure equations. An experimental apparatus was developed to verify the theoretical model. Simulating and experimental results show that the small-sized bubbles tend to generate in the turbulent cavitating flow when at a high rotary speed, and the bubbles mainly locate at the edges of the spiral groove. The simulating results also show that the direct stiffness coefficients are increased due to cavitation effect, and cross stiffness coefficients and damping coefficients are hardly affected by the cavitation effect. Turbulent effect on the dynamic characteristics of SGTB is much stronger than the cavitating effect.

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Determination of stiffness coefficients of hydrodynamic water-lubricated plain journal bearings

Cited by 75 publications

References 26 publications

A CFD-Based Frequency Response Method Applied in the Determination of Dynamic Coefficients of Hydrodynamic Bearings. Part 1: Theory

A CFD-Based Frequency Response Method Applied in the Determination of Dynamic Coefficients of Hydrodynamic Bearings. Part 1: Theory

A Methodology for Analyzing Radial Ball Bearing Vibrations

Dynamic Characteristics of High-speed Water-lubricated Spiral Groove Thrust Bearing based on Turbulent Cavitating Flow Lubrication Model

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