Computational Mixed TEHL Model and Stribeck Curve of a Journal Bearing

Cubillo, Adrian; Uriondo, Adrián; Perinpanayagam, Suresh

doi:10.1080/10402004.2016.1245456

Cited by 7 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By now no generally accepted method exists to determine these asperity peak properties [12]. Consequently, the elastic factor varies in different publications between 1 × 10 −4 and 5 × 10 −2 , e.g., [9,[13][14][15]. Additionally, Lu et al [16], and Sander et al [17] conducted investigations on Stribeck curves for journal bearings and used the model from [7] in their predictions.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

et al. 2018

View full text Add to dashboard Cite

This paper focuses on the operating behavior of journal bearings for industrial machinery application during run-ups. For this purpose, a numerical simulation code that is based on a two-dimensional extended and generalized Reynolds equation and a full three-dimensional energy equation, was advanced by a theoretical model considering the effects of mixed friction and warming of journal components during start-up. The mixed friction routine contained the elastic half-spaces model proposed by Boussinesq, which considers the influence of rough surfaces by implementing flow factors and calculates additional stiffness and dissipation in areas with solid interactions. Furthermore, a transient term was added in the energy equation to consider the thermal inertia of journal, and bearing to ensure a realistic heating during run-ups. Results of the prediction were compared to experimental data taken from a special test rig built up for validation procedures. Besides the conventional sensors for temperature, oil flow, and relative motion between shaft and stator, a contact voltage measurement was installed to determine the intensity of mixed friction. The evaluation of experimental data by Stribeck curves, based on a shaft torsion measurement, indicated a significant influence of run-up time on frictional moment. The friction coefficient of the rotor bearing system was strongly influenced by the run-up time. A short run-up time reduced the frictional coefficient in the mixed lubrication regime while the opposite behavior was observed in the hydrodynamic lubrication regime. The numerical code predicted these tendencies in good agreement with experimental data, however, only if the transient energy model was applied.

show abstract

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

et al. 2018

View full text Add to dashboard Cite

show abstract

“…(g) If altitude angle converges according to equation (26) then simulation stops, otherwise, a new value of altitude angle is calculated using equation (27) and repeat the Steps 4 to 6, till the equation ( 26) is satisfied.…”

Section: The Bearing Load Carryingmentioning

confidence: 99%

“…Greenwood and Williamson [24] or Greenwood and Tripp [25] elastic asperity contact models assume the Gaussian distribution of asperity heights. These elastic contact models have extensively been used by many researchers for the mixed-EHL analysis of WLJB [18,[26][27][28][29][30]. The roughness of bushing liner surface of WLJB is comparatively higher than journal surface [18].…”

Section: Introductionmentioning

confidence: 99%

Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime

Prajapati¹,

Ramkumar²

2022

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

Water-lubricated journal bearings (WLJB) are one of the important components of the stern tube shaft. Surface topography of WLJB is an important aspect in the design of stern tube shaft, and significantly affects the lubrication characteristics of WLJB. This work aims to investigate the effect of non-Gaussian surface topography on tribological performance of water-lubricated journal bearing (WLJB) under mixed-elastohydrodynamic lubrication (mixed-EHL) regime. The non-Gaussian flow factors, and a normalized Weibull probability density function is used to tackle the non-Gaussian roughness in hydrodynamic and asperity contact models respectively. From results, it is observed that skewness (Ssk) significantly affects both asperity contact pressure and hydrodynamic pressure along circumferential direction of bearing. It is concluded that for skewness, Ssk = -1 to 1, lambda ratio falls between 1 to 3. The relation between altitude angle and skewness is established. The effect of bearing length to diameter (L/D) ratio on lubrication performance of WLJB is also discussed in detail.

show abstract

“…The friction coefficient of journal bearings can be calculated by using Equation (12). The bearing and friction forces generated by the lubricant are determined according to the oil film thickness, which is always calculated even in very small oil film thickness.…”

Section: Numerical Calculation Procedures To Determine the Frictional...mentioning

confidence: 99%

“…Alex de Kraker et al [11] used the EHL (Elastohydrodynamic Lubrication) theory to derive the Stribeck curves considering elastic lubrication in very small oil film thickness. Furthermore, A. Cubillo et al [12] analyzed the oil film pressure of journal bearings using TEHL (Thermo-Elastohydrodynamic Lubrication) theory, which considered the viscosity of lubricants to vary with temperature. Zhuming Bi et al [13] proposed a method of setting up an EHL model and how to verify it.…”

Section: Introductionmentioning

confidence: 99%

Numerical Determination of the Frictional Coefficients of a Fluid Film Journal Bearing Considering the Elastohydrodynamic Lubrication and the Asperity Contact Force

et al. 2022

View full text Add to dashboard Cite

This paper proposes a numerical method to investigate the frictional characteristics of a fluid film journal bearing considering the elastohydrodynamic lubrication and the asperity contact force. We solved the average Reynolds equation by utilizing the FEM to determine the hydrodynamic force developed by the lubricant of the journal bearing. We also used a modified GT model (Greenwood–Tripp model) developed by Greenwood and Tripp to decompose the asperity contact force into normal and tangential directions. Once we applied those forces to a rotor, we solved the equations of motion of a flexible shaft to determine the friction coefficient. We verified the proposed method by comparing the calculated friction coefficient with the measured one of journal bearings conducted by prior researchers. Then, the proposed method was applied to investigate the frictional characteristics of a journal bearing of a scroll compressor on which dynamic loads are applied. This paper can contribute to developing robust rotor systems supported by journal bearings.

show abstract

Computational Mixed TEHL Model and Stribeck Curve of a Journal Bearing

Cited by 7 publications

References 32 publications

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

Theoretical and Experimental Investigations on Transient Run-Up Procedures of Journal Bearings Including Mixed Friction Conditions

Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime

Numerical Determination of the Frictional Coefficients of a Fluid Film Journal Bearing Considering the Elastohydrodynamic Lubrication and the Asperity Contact Force

Contact Info

Product

Resources

About