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Détail de l'auteur
Auteur H. Sojoudi
Documents disponibles écrits par cet auteur
Affiner la rechercheOn the behavior of friction in lubricated point contact with provision for surface roughness / H. Sojoudi in Transactions of the ASME . Journal of tribology, Vol. 132 N° 1 (Janvier 2010)
[article]
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 08 p.
Titre : On the behavior of friction in lubricated point contact with provision for surface roughness Type de document : texte imprimé Auteurs : H. Sojoudi, Auteur ; M. M. Khonsari, Auteur Année de publication : 2010 Article en page(s) : 08 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Elastodynamics Hydrodynamics Liquid films Lubrication Mechanical contact Sliding friction Surface roughness Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a simple approach to predict the behavior of friction coefficient in the sliding lubricated point contact. Based on the load-sharing concept, the total applied load is supported by the combination of hydrodynamic film and asperity contact. The asperity contact load is determined in terms of maximum Hertzian pressure in the point contact while the fluid hydrodynamic pressure is calculated through adapting the available numerical solutions of elastohydrodynamic lubrication (EHL) film thickness formula for smooth surfaces. The simulations presented cover the entire lubrication regime including full-film EHL, mixed-lubrication, and boundary-lubrication. The results of friction, when plotted as a function of the sum velocity, result in the familiar Stribeck-type curve. The simulations are verified by comparing the results with published experimental data. A parametric study is conducted to investigate the influence of operating condition on the behavior of friction coefficient. A series of simulations is performed under various operating conditions to explore the behavior of lift-off speed. An equation is proposed to predict the lift-off speed in sliding lubricated point contact, which takes into account the surface roughness. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] On the behavior of friction in lubricated point contact with provision for surface roughness [texte imprimé] / H. Sojoudi, Auteur ; M. M. Khonsari, Auteur . - 2010 . - 08 p.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 08 p.
Mots-clés : Elastodynamics Hydrodynamics Liquid films Lubrication Mechanical contact Sliding friction Surface roughness Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a simple approach to predict the behavior of friction coefficient in the sliding lubricated point contact. Based on the load-sharing concept, the total applied load is supported by the combination of hydrodynamic film and asperity contact. The asperity contact load is determined in terms of maximum Hertzian pressure in the point contact while the fluid hydrodynamic pressure is calculated through adapting the available numerical solutions of elastohydrodynamic lubrication (EHL) film thickness formula for smooth surfaces. The simulations presented cover the entire lubrication regime including full-film EHL, mixed-lubrication, and boundary-lubrication. The results of friction, when plotted as a function of the sum velocity, result in the familiar Stribeck-type curve. The simulations are verified by comparing the results with published experimental data. A parametric study is conducted to investigate the influence of operating condition on the behavior of friction coefficient. A series of simulations is performed under various operating conditions to explore the behavior of lift-off speed. An equation is proposed to predict the lift-off speed in sliding lubricated point contact, which takes into account the surface roughness. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] On the modeling of quasi-steady and unsteady dynamic friction in sliding lubricated line contact / H. Sojoudi in Transactions of the ASME . Journal of tribology, Vol. 132 N° 1 (Janvier 2010)
[article]
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 09 p.
Titre : On the modeling of quasi-steady and unsteady dynamic friction in sliding lubricated line contact Type de document : texte imprimé Auteurs : H. Sojoudi, Auteur ; M. M. Khonsari, Auteur Année de publication : 2010 Article en page(s) : 09 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Lubrication Mechanical contact Sliding friction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A simple but realistic dynamic friction model for the lubricated sliding contact is developed based on decoupling the steady and unsteady terms in Reynolds equation. The model realistically captures the physics of friction behavior both when speed is increased unidirectionally or when operating under oscillating condition. The model can simulate the transition from boundary to mixed to full film regimes as the speed is increased. Two different classes of simulations are performed to show the utility of the model: the so-called quasisteady, where the sliding velocity is varied very slowly, and the oscillating sliding velocity, where the friction coefficient exhibits a hysteresis type behavior. Both categories of simulation are verified by comparing the results with published experimental data. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] On the modeling of quasi-steady and unsteady dynamic friction in sliding lubricated line contact [texte imprimé] / H. Sojoudi, Auteur ; M. M. Khonsari, Auteur . - 2010 . - 09 p.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 09 p.
Mots-clés : Lubrication Mechanical contact Sliding friction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A simple but realistic dynamic friction model for the lubricated sliding contact is developed based on decoupling the steady and unsteady terms in Reynolds equation. The model realistically captures the physics of friction behavior both when speed is increased unidirectionally or when operating under oscillating condition. The model can simulate the transition from boundary to mixed to full film regimes as the speed is increased. Two different classes of simulations are performed to show the utility of the model: the so-called quasisteady, where the sliding velocity is varied very slowly, and the oscillating sliding velocity, where the friction coefficient exhibits a hysteresis type behavior. Both categories of simulation are verified by comparing the results with published experimental data. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]