Influence of Wall Slip on the Dynamic Properties of a Rotor-Bearing System

Ma, G. J.; Wu, Chengwei; Zhou, P.

doi:10.1080/10402000801926539

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…Moreover, the optimized slip parameters have been shown to dramatically enhance the performance characteristics of the bearings, specifically Fluids 2021, 6, 48 2 of 22 in increasing the bearing stability performance [10,11] and in suppressing the occurrence of cavitation [12]. Related studies revealed even that in some conditions, a concentric journal bearing exhibits better tribological characteristics than a heterogeneous slip/no-slip slip journal bearing at higher eccentricity ratios optimized for different working conditions [13][14][15][16]. This indicates that the geometrical wedge effect is not the only mechanism in lifting the pressure generation of the slip journal bearing.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Tribological Performance of Heterogeneous Slip/No-Slip Journal Bearing Considering Thermo-Hydrodynamic Effects

Tauviqirrahman

Afif

Paryanto

et al. 2021

Fluids

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The slip boundary has an important influence on hydrodynamic journal bearing. However, less attention has been paid to the positive effect of slip on thermal behaviour. In this study, a computational fluid dynamics (CFD) analysis investigating the thermo-hydrodynamic (THD) characteristics of heterogeneous slip/no-slip bearings running under steady, incompressible, and turbulent conditions is presented. A comprehensive analysis is made to investigate the THD behaviours of heterogeneous slip/no-slip bearings in terms of lubricant pressure, temperature distribution, volume fraction of vapor, and load-carrying capacity when they are running under different shaft rotational speeds. The multiphase cavitation model is adopted to represent the real operational condition of the journal bearing. Numerical results show that the load-carrying capacity of the heterogeneous slip/no-slip bearing can be significantly increased by up to 100% depending on the rotational speed. It is also observed that there is an optimal journal rotational speed for maximizing the load-carrying capacity. An insightful new finding is revealed in a numerical framework, wherein it is found that by introducing the heterogeneous slip/no-slip pattern, the maximum temperature can be reduced by up to 25% in comparison with a conventional bearing.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Tribological Performance of Heterogeneous Slip/No-Slip Journal Bearing Considering Thermo-Hydrodynamic Effects

Tauviqirrahman

Afif

Paryanto

et al. 2021

Fluids

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“…Ma et al. 24 investigated stability of finite length journal bearings based on the influence of wall slip. The wall slip generally reduces the system operation stability, as well as the load carrying capacity with a single slip property sleeve surface.…”

Section: Introductionmentioning

confidence: 99%

“…Wu 23 investigated for increase in load capacity and decrease in friction coefficient of journal bearing considering optimized slip zone on bearing surface. Ma et al 24 investigated stability of finite length journal bearings based on the influence of wall slip. The wall slip generally reduces the system operation stability, as well as the load carrying capacity with a single slip property sleeve surface.…”

Section: Introductionmentioning

confidence: 99%

Static and stability analysis of partial slip texture multi-lobe journal bearings

Rao

Rani

Mohamed

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents one-dimensional analysis of modified dynamic Reynolds equation derived for partial slip texture multi-lobe journal bearings. The novelty included in this study is the configuration of partial slip texture region on the bottom bearing lobe surface of a multi-lobe journal bearing under a constant vertical load. The nondimensional pressure and shear stress for steady-state and nondimensional pressure gradients for dynamic coefficients for each lobe with partial slip texture configuration are derived based on narrow groove theory. Linearized stability analysis is evaluated using infinitesimal perturbation method. Results of static and stability characteristics of partial slip texture multi-lobe (two-axial groove, elliptical, three-lobe and offset) journal bearings are presented. Partial slip texture configuration significantly enhances load capacity, coefficient of friction, and stability of two-lobe journal bearing.

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“…Elrod and Vijayaraghavan (1994) presented linearized stability threshold of liquid lubricated journal bearings using dynamic perturbation of Reynolds equation taking into account the flow within the cavitation region. Ma et al (2008) studied the influence of wall slip on the stability of the rotor supported by finite-length journal bearings. Based on an optimized slip surface on sleeve, the wall slip enhances stability as well as the load-carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

Stability evaluation of three-layered journal bearing with slip/partial slip

Rao

Rani

Awang

et al. 2017

ILT

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Purpose This paper aims to present stability of a three-layered journal bearing considering magnitude of the layers’ thicknesses and viscosities with slip/partial slip on the bearing surface. Design/methodology/approach Modified Reynolds equation based on one-dimensional analysis is derived for a three-layered journal bearing with slip/partial slip. Dynamic coefficients are derived based on infinitesimal perturbation method. Linearized stability analysis is presented taking into account slip/partial slip on bearing surface; thicknesses and viscosities of bearing surface layer; and core layer and journal surface layer. Findings Results of threshold speed and critical whirl frequency ratio coefficients (Cω, CΩ), stiffness (Kij for i = x,y) and damping (Bij for i = x, y) coefficients and threshold speed (ωs) and critical whirl frequency ratio (Ωs) are presented. The bearing surface is analyzed for slip (total surface with slip) and partial slip (partial surface with slip). The slip-on bearing surface reduces stability, while partial slip improves bearing stability. The threshold speed coefficient (Cω) decreases with slip on bearing surface. The threshold speed (ωs) and critical whirl frequency ratio (Ωs) are influenced by the variation of threshold speed coefficient (Cω) and critical whirl frequency ratio coefficient (CΩ), respectively. A three-layered journal bearing with partial slip and thick high viscosity bearing surface layer results in higher threshold speed coefficient and has a potential to improve stability of journal bearing. The analyses indicate that optimal angular extent of partial slip region (θs) enhances the stability of journal bearing. Originality/value The paper presents parametric study of stability coefficients (Cω and CΩ) and evaluation of threshold speed (ωs) and critical whirl frequency ratio (Ωs) of a three-layered journal bearing with slip/partial slip.

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Influence of Wall Slip on the Dynamic Properties of a Rotor-Bearing System

Cited by 13 publications

References 30 publications

Investigation of the Tribological Performance of Heterogeneous Slip/No-Slip Journal Bearing Considering Thermo-Hydrodynamic Effects

Investigation of the Tribological Performance of Heterogeneous Slip/No-Slip Journal Bearing Considering Thermo-Hydrodynamic Effects

Static and stability analysis of partial slip texture multi-lobe journal bearings

Stability evaluation of three-layered journal bearing with slip/partial slip

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