Documents disponibles écrits par cet auteur

An experimental study of oil-lubricated journal bearings undergoing oscillatory motion / Xiaobin Lu in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 7 p. Titre : An experimental study of oil-lubricated journal bearings undergoing oscillatory motion Type de document : texte imprimé Auteurs : Xiaobin Lu, Auteur ; M. M. Khonsari, Auteur Année de publication : 2008 Article en page(s) : 7 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Oil-lubricated  journal  Oscillatory  motion Résumé : A distinctive behavior of an oil-lubricated journal bearing undergoing oscillatory motion is the evolution of friction hysteresis as it traverses from boundary, to mixed, and to hydrodynamic regime. In this paper, the results of a series of experiments are reported to examine the effects of load, with or without oil, oil type, oil inlet temperature, and oscillating frequency on the friction hysteresis. Three types of hysteresis loop were found. The inertia of the lubricant flow contributes to the friction hysteresis. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468028 [article] An experimental study of oil-lubricated journal bearings undergoing oscillatory motion [texte imprimé] / Xiaobin Lu, Auteur ; M. M. Khonsari, Auteur . - 2008 . - 7 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 7 p. Mots-clés : Oil-lubricated  journal  Oscillatory  motion Résumé : A distinctive behavior of an oil-lubricated journal bearing undergoing oscillatory motion is the evolution of friction hysteresis as it traverses from boundary, to mixed, and to hydrodynamic regime. In this paper, the results of a series of experiments are reported to examine the effects of load, with or without oil, oil type, oil inlet temperature, and oscillating frequency on the friction hysteresis. Three types of hysteresis loop were found. The inertia of the lubricant flow contributes to the friction hysteresis. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468028

Combined effects of shear thinning and viscous heating on EHL characteristics of rolling/sliding line contacts / Punit Kumar in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 13 p. Titre : Combined effects of shear thinning and viscous heating on EHL characteristics of rolling/sliding line contacts Type de document : texte imprimé Auteurs : Punit Kumar, Auteur ; M. M. Khonsari, Auteur Article en page(s) : 13 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Temperature  Fluids  Lubricants  Shear  (Mechanics)  Equations  Film  thickness  Heating  Stress  Pressure  Viscosity Résumé : The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated into the model to describe shear thinning. An extensive set of numerical simulations is presented. Comparison of the film thickness predictions with published experiments reveals good agreement, and it is shown that thermal effect plays an important role in the precise estimation of EHL film thickness and friction coefficient. Parametric simulations show that thermal effect in shear-thinning fluids is strongly affected by the power-law index used in the Carreau equation. Comparisons of prediction of the Newtonian fluid model are presented to quantify the degree to which it overestimates the film thickness. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468111 [article] Combined effects of shear thinning and viscous heating on EHL characteristics of rolling/sliding line contacts [texte imprimé] / Punit Kumar, Auteur ; M. M. Khonsari, Auteur . - 13 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 13 p. Mots-clés : Temperature  Fluids  Lubricants  Shear  (Mechanics)  Equations  Film  thickness  Heating  Stress  Pressure  Viscosity Résumé : The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated into the model to describe shear thinning. An extensive set of numerical simulations is presented. Comparison of the film thickness predictions with published experiments reveals good agreement, and it is shown that thermal effect plays an important role in the precise estimation of EHL film thickness and friction coefficient. Parametric simulations show that thermal effect in shear-thinning fluids is strongly affected by the power-law index used in the Carreau equation. Comparisons of prediction of the Newtonian fluid model are presented to quantify the degree to which it overestimates the film thickness. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468111

Condition monitoring of molybdenum disulphide coated thrust ball bearings using time-frequency signal analysis / Ali Kahirdeh in Transactions of the ASME . Journal of tribology, Vol. 132 N° 4 (Octobre 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010) . - 11 p. Titre : Condition monitoring of molybdenum disulphide coated thrust ball bearings using time-frequency signal analysis Type de document : texte imprimé Auteurs : Ali Kahirdeh, Auteur ; M. M. Khonsari, Auteur Année de publication : 2011 Article en page(s) : 11 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Ball  bearings  Condition  monitoring  Friction  Lubricants  Molybdenum  compounds  Time-frequency  analysis  Wear Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A method for detection of wear in thrust ball bearings coated with molybdenum disulphide (MoS2) is presented. It employs an energy feature obtained from time-frequency representation of the vibration signal. Extensive experimental studies are conducted to verify the efficacy of the proposed method for fault diagnosis of MoS2 coating. These experiments are conducted under both oscillatory and unidirectional motions. The results of vibrations are corroborated with the friction coefficient from the onset of the motion until failure develops. Through monitoring of the energy in time-frequency domain as well as the coefficient of friction, three stages of coating life are identified. They are healthy period, developing damage, and failure. It is shown that the energy feature can detect whenever wear and damage appear and solid lubricant loses its lubrication capabilities. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Condition monitoring of molybdenum disulphide coated thrust ball bearings using time-frequency signal analysis [texte imprimé] / Ali Kahirdeh, Auteur ; M. M. Khonsari, Auteur . - 2011 . - 11 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010) . - 11 p. Mots-clés : Ball  bearings  Condition  monitoring  Friction  Lubricants  Molybdenum  compounds  Time-frequency  analysis  Wear Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A method for detection of wear in thrust ball bearings coated with molybdenum disulphide (MoS2) is presented. It employs an energy feature obtained from time-frequency representation of the vibration signal. Extensive experimental studies are conducted to verify the efficacy of the proposed method for fault diagnosis of MoS2 coating. These experiments are conducted under both oscillatory and unidirectional motions. The results of vibrations are corroborated with the friction coefficient from the onset of the motion until failure develops. Through monitoring of the energy in time-frequency domain as well as the coefficient of friction, three stages of coating life are identified. They are healthy period, developing damage, and failure. It is shown that the energy feature can detect whenever wear and damage appear and solid lubricant loses its lubrication capabilities. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

Correction factor formula to predict the central and minimum film thickness for shear-thinning fluids in EHL / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 4 p. Titre : Correction factor formula to predict the central and minimum film thickness for shear-thinning fluids in EHL Type de document : texte imprimé Auteurs : J. Y. Jang, Auteur ; M. M. Khonsari, Auteur ; Scott Bair, Auteur Année de publication : 2008 Article en page(s) : 4 p. Note générale : Tribology Langues : Anglais (eng) En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468043 [article] Correction factor formula to predict the central and minimum film thickness for shear-thinning fluids in EHL [texte imprimé] / J. Y. Jang, Auteur ; M. M. Khonsari, Auteur ; Scott Bair, Auteur . - 2008 . - 4 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 4 p. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468043

EHL circular contact film thickness correction factor for shear-thinning fluids / Punit Kumar in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 7 p. Titre : EHL circular contact film thickness correction factor for shear-thinning fluids Type de document : texte imprimé Auteurs : Punit Kumar, Auteur ; M. M. Khonsari, Auteur Article en page(s) : 7 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Fluids  Shear  (Mechanics)  Equations  Film  thickness  Lubricants  Engineering  simulation  Pressure Résumé : An extensive set of full elastohydrodynamic lubrication point contact simulations has been used to develop correction factors to account for the effect of shear-thinning lubricant behavior on the central and minimum film thickness in circular contacts under pure rolling condition. The film thickness for a shear-thinning lubricant can be easily obtained by dividing the corresponding Newtonian film thickness by the appropriate correction factor. Comparisons of the film thickness values obtained using the correction factors have been matched with the published experimental results pertaining to shear-thinning lubricants with a variety of realistic flow and piezoviscous properties under a wide range of operating speed. The good agreement between them establishes the validity and versatility of the correction factors developed in this paper. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468112 [article] EHL circular contact film thickness correction factor for shear-thinning fluids [texte imprimé] / Punit Kumar, Auteur ; M. M. Khonsari, Auteur . - 7 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 7 p. Mots-clés : Fluids  Shear  (Mechanics)  Equations  Film  thickness  Lubricants  Engineering  simulation  Pressure Résumé : An extensive set of full elastohydrodynamic lubrication point contact simulations has been used to develop correction factors to account for the effect of shear-thinning lubricant behavior on the central and minimum film thickness in circular contacts under pure rolling condition. The film thickness for a shear-thinning lubricant can be easily obtained by dividing the corresponding Newtonian film thickness by the appropriate correction factor. Comparisons of the film thickness values obtained using the correction factors have been matched with the published experimental results pertaining to shear-thinning lubricants with a variety of realistic flow and piezoviscous properties under a wide range of operating speed. The good agreement between them establishes the validity and versatility of the correction factors developed in this paper. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468112

Elastohydrodynamic line-contact of compressible shear thinning fluids with consideration of the surface roughness / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 132 N° 3 (Juillet 2010) 

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Experimental investigation on the stick-slip phenomenon in granular collision lubrication / Karim N. Elkholy in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008) 

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A modification of the switch function in the elrod cavitation algorithm / M. Fesanghary in Transactions of the ASME . Journal of tribology, Vol. 133 N° 2 (Avril 2011) 

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On 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) 

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On the behavior of misaligned journal bearings based on mass-conservative thermohydrodynamic analysis / J. Y. Jang in Transactions of the ASME . Journal of tribology, Vol. 132 N° 1 (Janvier 2010) 

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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) 

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On the prediction of running-in behavior in mixed-lubrication line contact / Saleh Akbarzadeh in Transactions of the ASME . Journal of tribology, Vol. 132 N° 3 (Juillet 2010) 

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Performance analysis of full-film textured surfaces with consideration of roughness effects / Y. Qiu in Transactions of the ASME . Journal of tribology, Vol. 133 N° 2 (Avril 2011) 

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Performance of spur gears considering surface roughness and shear thinning lubricant / S. Akbarzadeh in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008) 

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Scale effects in generalized Newtonian elastohydrodynamic films / Ilya I. Kudish in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008) 

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