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A new approach to modeling surface defects in bearing dynamics simulations / Ankur Ashtekar 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) . - 8 p. Titre : A new approach to modeling surface defects in bearing dynamics simulations Type de document : texte imprimé Auteurs : Ankur Ashtekar, Auteur ; Farshid Sadeghi, Auteur ; Lars-Erik Stacke, Auteur Article en page(s) : 8 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Product  quality  Bearings  Dynamics  (Mechanics)  Force  Deflection  Engineering  simulation  Modeling  Motion Résumé : A dynamic model for deep groove and angular contact ball bearings was developed to investigate the influence of race defects on the motions of bearing components (i.e., inner and outer races, cage, and balls). In order to determine the effects of dents on the bearing dynamics, a model was developed to determine the force-deflection relationship between an ellipsoid and a dented semi-infinite domain. The force-deflection relationship for dented surfaces was then incorporated in the bearing dynamic model by replacing the well-known Hertzian force-deflection relationship whenever a ball/dent interaction occurs. In this investigation, all bearing components have six degrees-of-freedom. Newton’s laws are used to determine the motions of all bearing elements, and an explicit fourth-order Runge–Kutta algorithm with a variable or constant step size was used to integrate the equations of motion. A model was used to study the effect of dent size, dent location, and inner race speed on bearing components. The results indicate that surface defects and irregularities like dent have a severe effect on bearing motion and forces. Furthermore, these effects are even more severe for high-speed applications. The results also demonstrate that a single dent can affect the forces and motion throughout the entire bearing and on all bearing components. However, the location of the dent dictates the magnitude of its influence on each bearing component. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468093#D [...] [article] A new approach to modeling surface defects in bearing dynamics simulations [texte imprimé] / Ankur Ashtekar, Auteur ; Farshid Sadeghi, Auteur ; Lars-Erik Stacke, Auteur . - 8 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 8 p. Mots-clés : Product  quality  Bearings  Dynamics  (Mechanics)  Force  Deflection  Engineering  simulation  Modeling  Motion Résumé : A dynamic model for deep groove and angular contact ball bearings was developed to investigate the influence of race defects on the motions of bearing components (i.e., inner and outer races, cage, and balls). In order to determine the effects of dents on the bearing dynamics, a model was developed to determine the force-deflection relationship between an ellipsoid and a dented semi-infinite domain. The force-deflection relationship for dented surfaces was then incorporated in the bearing dynamic model by replacing the well-known Hertzian force-deflection relationship whenever a ball/dent interaction occurs. In this investigation, all bearing components have six degrees-of-freedom. Newton’s laws are used to determine the motions of all bearing elements, and an explicit fourth-order Runge–Kutta algorithm with a variable or constant step size was used to integrate the equations of motion. A model was used to study the effect of dent size, dent location, and inner race speed on bearing components. The results indicate that surface defects and irregularities like dent have a severe effect on bearing motion and forces. Furthermore, these effects are even more severe for high-speed applications. The results also demonstrate that a single dent can affect the forces and motion throughout the entire bearing and on all bearing components. However, the location of the dent dictates the magnitude of its influence on each bearing component. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468093#D [...]