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Mixed-TEHD model for journal-bearing conformal contact - Part II: Contact, film thickness, and performance analyses

About: The article was published on 1997-12-01 and is currently open access. It has received 56 citations till now. The article focuses on the topics: Bearing (mechanical).
Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors report the results of a series of experiments performed on a journal bearing together with a theoretical prediction of the Stribeck-type behavior for various loads and oil temperatures.
Abstract: The Stribeck curve plays an important role in identifying boundary, mixed, elastohydrodynamic, and hydrodynamic lubrication regimes. Recent advances in elastohydrodynamic lubrication together with rough surface interaction have made it possible to develop a methodology for predicting the trend of the Stribeck curve. In this paper; we report the results of a series of experiments performed on a journal bearing together with a theoretical prediction of the Stribeck-type behavior. Various loads and oil temperatures are considered. The comparison between the experimental results with a mixed elastohydrodynamic lubrication model for line contacts is indicative of good agreement.

212 citations

Journal ArticleDOI
TL;DR: In this article, a mixed elastohydrodynamic lubrication (EHL) model for finite length elastic journal bearings is described and the finite element method is employed to discretise the coupled system of 2D-3D Reynolds-structure equations and to compute Stribeck curves at constant load.

76 citations

Journal ArticleDOI
TL;DR: In this paper, a steady-state mixed-TEHD (thermo-elasto-hydrodynamic) model for journal bearings is developed, which considers the fluid flow in the gap formed by rough surfaces, asperity contact, surface thermoelastic deformations, and a temperature-pressure-viscosity relationship for the lubricant, as well as an angular misalignment between the journal and the bearing.

74 citations


Cites background from "Mixed-TEHD model for journal-bearin..."

  • ...[21] through a numerical model that did not consider shaft deflection....

    [...]

01 Jan 2000
TL;DR: A deterministic mixed lubrication model, governing the interface between a movingsmooth rigid surface and a stationary rough elastic surface, has been developed in this paper, where both thenormal and shear deformations of the elastic surface are considered, as well as interasperity cavitation.
Abstract: A deterministic mixed lubrication model, governing the interface between a movingsmooth rigid surface and a stationary rough elastic surface, has been developed. Both thenormal and shear deformations of the elastic surface are considered, as well as interas-perity cavitation. Utilizing an analogy between the hydrodynamic lubrication (withcavitation) problem and the asperity contact problem, a generalized computationalformulation is derived and a unique solution scheme constructed to solve these seeminglydifferent problems. The model has been applied to the rotary lip seal, and used to predictthe performance characteristics over a range of shaft speeds.

74 citations

References
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Journal ArticleDOI
TL;DR: In this article, a mathematical model for piston skirls in mixed lubrication is presented, taking into account the effects of surface waviness, roughness, piston skirling surface profile, bulk elastic deformation and thermal distortion on piston motion, lubrication and friction.
Abstract: This paper presents a mathematical model for piston skirls in mixed lubrication. It lakes into account the effects of surface waviness, roughness, piston skirl surface profile, bulk elastic deformation and thermal distortion of both piston skirls and cylinder bore on piston motion, lubrication and friction. The corresponding computer program developed can be used to calculate the entire piston trajectory and the hydrodynamic and contact friction forces as functions of crack angle under engine running conditions

146 citations

Journal ArticleDOI
TL;DR: In this article, a series of contact simulations were conducted in order to investigate the effects of the surface topography, material hardness and load on the deformation behavior of the rough surfaces.
Abstract: Surface roughness plays an important role in affecting friction, wear, and lubrication of contacting bodies. A small change in the distribution of the asperity heights and widths can have a significant effect on the performance variables which include the real area of contact, the average gap, and the average asperity contact pressure. A series of contact simulations were conducted in order to investigate the effects of the surface topography, material hardness and load on the deformation behavior of the rough surfaces. These surfaces were numerically generated by computer and varied widely in statistical roughness properties, ranging from isotropic to strongly anisotropic. The current simulations took into account the elastic-plastic deformation behavior of the asperities. Using the contact simulation results, the performance variables were curve-fitted to convenient analytical formulas as functions of the surface roughness parameters, material hardness, and load. Presented at the 49th Annual Meeting in ...

102 citations

01 Dec 1996
TL;DR: In this article, the average Reynolds equation derived by Patir and Cheng was utilized in the lubrication analysis of finite journal bearings operating with large eccentricity ratios to better understand the mixed lubrication phenomena in conformal contacts.
Abstract: Numerical analyses of finite journal bearings operating with large eccentricity ratios were conducted to better understand the mixed lubrication phenomena in conformal contacts. The average Reynolds equation derived by Patir and Cheng was utilized in the lubrication analysis. The influence function, calculated numerically using the finite element method, was employed to compute the bearing deformation. The effects of bearing surface roughness were incorporated in the present analysis for the calculations of the asperity contact pressure and the asperity contact area. The numerical solutions of the hydrodynamic and asperity contact pressures, lubricant film thickness, and asperity contact area were evaluated based on a simulated bearing-journal geometry. The calculations revealed that the asperity contact pressure may vary significantly along both the width and the circumferential directions. It was also shown that the asperity contacts and the lubricant film thickness were strongly dependent on the bearing width, asperity orientation, and operating conditions.

42 citations