Hydrodynamic and Elastohydrodynamic Studies of a Cylindrical Journal Bearing

Hili, Molka Attia; Bouaziz, Samir; Maatar, M.; Fakhfakh, Tahar; Haddar, Mohamed

doi:10.1016/s1001-6058(09)60041-x

Cited by 46 publications

(8 citation statements)

References 15 publications

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“…Attia et al. 28 studied the hydrodynamic simulation model considering the elastic deformation of the bearing. Their study clearly demonstrated that the deformation in bearing affects the pressure field in the clearance and increases the fluid film thickness.…”

Section: Introductionmentioning

confidence: 99%

Elasto-hydrodynamic analysis of journal bearing operating with nanolubricants

Khan

Dhanola

Garg

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, performance parameters of a rigid and flexible journal bearing using non-Newtonian nanolubricants have been investigated and compared. Krieger-Dougherty viscosity model has been implemented with a non-Newtonian model (power law) to evaluate the effective viscosity of nanolubricants. In order to attain the pressure field of nanolubricants, a numerical solution of the modified Reynolds equation has been derived with initial assumptions and boundary conditions using finite difference method. The static performance parameters for both the bearings have been examined at different values of power law index and eccentricity ratio. The results demonstrate that the load-carrying capacity, maximum pressure and friction force increase significantly using nanolubricant in comparison to base lubricant. Also, the values of these parameters increase with increase of power law index. An insignificant effect of elastic deformation is observed on performance parameters except attitude angle at a particular power law index value.

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Section: Introductionmentioning

confidence: 99%

Elasto-hydrodynamic analysis of journal bearing operating with nanolubricants

Khan

Dhanola

Garg

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Depending on the concrete application, deformation can have positive as well as negative impact on the load-carrying capacity of sliding bearings. If elasto-hydrodynamic deformation is dominant, a rise of the film thickness compared to the hydrodynamic theory exists [9]. Conversely, Hagemann et al [10] show a reduction of film thickness for a large five-pad tilting-pad journal bearing due to consideration of thermo-mechanical deformation in their analysis and validate the results with experimental data.…”

Section: Introductionmentioning

confidence: 92%

“…However, the eccentricity of axial forces causes a moment load Msc that has to be restored by the bearing. This moment load follows according to Equation (9).…”

Section: Bearing Loads Due To Mesh Forcesmentioning

confidence: 99%

Operating Behavior of Sliding Planet Gear Bearings for Wind Turbine Gearbox Applications—Part I: Basic Relations

et al. 2021

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The application of sliding planet gear bearings in wind turbine gearboxes has become more common in recent years. Assuming practically applied helix angles, the gear mesh of the planet stage causes high force and moment loads for these bearings involving high local loads at the bearing edges. Specific operating behavior and suitable design measures to cope with these challenging conditions are studied in detail based on a thermo-hydrodynamic (THD) bearing model. Radial clearance and axial crowning are identified as important design parameters to reduce maximum pressures occurring at the bearing edges. Furthermore, results indicate that a distinct analysis of the gear mesh load distribution is required to characterize bearing operating behavior at part-load. Here, operating conditions as critical as the ones reached at nominal load might occur. Wear phenomena can improve the shape of the gap in the circumferential as well as in axial direction incorporating a significant reduction of local maximum pressures. The complexity of the combination of these aspects and the additionally expected impact of structure deformation gives an insight into the challenges in the design processes of sliding planet gear bearings for wind turbine gearbox applications.

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“…There are different methods to obtain the bearing coefficients,such as, experimental (Tiwari et al 2004, Mao et al 2016analytical (Chasalevris andSfyris, Wang andKhonsari 2006, Miraskari et al 2018a), finite difference method(FDM) (Gero and McC. Ettles 1986, Qiu and Tieu 1995, Goodwin et al 1997, finite element method (FEM) (Wada et al 1971, Mourelatos 1985, Arregui and Vázquez 2001, Nair and Nair 2004, Awasthi et al 2006, Hili et al 2010 , mesh less method with radial basis (MMRB) (Nicoletti 2013) and computational fluid dynamics (CFD) (Gao et al 2014, Zhang et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Bifurcation Analysis of Rotor/Bearing System using Third Order Journal Bearings Stiffness and Damping Coefficients

El-Sayed

Sayed

2021

Preprint

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Journal bearings have many applications in industry due to its high load carrying capacity. In addition proper design of journal bearings enables safe operation at very high speeds. However, they are susceptible to oil whirl instability which may cause bearing failure. The fluid film pressure distribution inside the journal bearing is described by Reynolds equation. Many studies had been done to approximate the bearing performance using first order bearing coefficients. Although this analysis is stable for evaluating the threshold speed but it is insensitive to limit cycles above the threshold speed. Mush literature show that above the threshold speed, subcritical or supercritical bifurcations may be observed. Therefore, the aim of the present paper is to evaluate the third order bearing coefficients for a finite length journal bearing using finite perturbation method. The values of these coefficients are evaluated using infinitesimal perturbation analysis. These values are used to investigate the bifurcation stability of flexible Jeffcott rotor supported by two symmetric journal bearings. The effect of rotor stiffness ratio on the bifurcation stability of the system is investigated. The results of this work show that the third order parameters can be used to evaluate the type of bifurcation above the threshold speed.

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Hydrodynamic and Elastohydrodynamic Studies of a Cylindrical Journal Bearing

Cited by 46 publications

References 15 publications

Elasto-hydrodynamic analysis of journal bearing operating with nanolubricants

Elasto-hydrodynamic analysis of journal bearing operating with nanolubricants

Operating Behavior of Sliding Planet Gear Bearings for Wind Turbine Gearbox Applications—Part I: Basic Relations

Bifurcation Analysis of Rotor/Bearing System using Third Order Journal Bearings Stiffness and Damping Coefficients

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