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A new analytic approximation for the hydrodynamic forces in finite-length journal bearings / Yaser Bastani in Transactions of the ASME . Journal of tribology, Vol. 132 N° 1 (Janvier 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 132 N° 1 (Janvier 2010) . - 09 p. Titre : A new analytic approximation for the hydrodynamic forces in finite-length journal bearings Type de document : texte imprimé Auteurs : Yaser Bastani, Auteur ; Marcio de Queiroz, Auteur Année de publication : 2010 Article en page(s) : 09 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Fluidics  Hydrodynamics  Integration  Machine  bearings  Polynomials Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A new method for determining a closed-form expression for the hydrodynamic forces in finite-length plain journal bearings is introduced. The method is based on applying correction functions to the force models of the infinitely long (IL) or infinitely short (IS) bearing approximation. The correction functions are derived by modeling the ratio between the forces from the numerical integration of the two-dimensional Reynolds equation and the forces from either the IL or IS bearing approximation. Low-order polynomial models, dependent on the eccentricity ratio and aspect ratio, are used for the correction functions. A comparative computational study is presented for the steady-state behavior of the bearing system under static and unbalance loads. The results show the proposed models outperforming the standard limiting approximations as well as a model based on the finite-length impedance method. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] A new analytic approximation for the hydrodynamic forces in finite-length journal bearings [texte imprimé] / Yaser Bastani, Auteur ; Marcio de Queiroz, 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 : Fluidics  Hydrodynamics  Integration  Machine  bearings  Polynomials Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A new method for determining a closed-form expression for the hydrodynamic forces in finite-length plain journal bearings is introduced. The method is based on applying correction functions to the force models of the infinitely long (IL) or infinitely short (IS) bearing approximation. The correction functions are derived by modeling the ratio between the forces from the numerical integration of the two-dimensional Reynolds equation and the forces from either the IL or IS bearing approximation. Low-order polynomial models, dependent on the eccentricity ratio and aspect ratio, are used for the correction functions. A comparative computational study is presented for the steady-state behavior of the bearing system under static and unbalance loads. The results show the proposed models outperforming the standard limiting approximations as well as a model based on the finite-length impedance method. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]