Documents disponibles écrits par cet auteur

An analytical complete model of tilting-pad journal bearing considering pivot stiffness and damping / Zhiyong Yan in Transactions of the ASME . Journal of tribology, Vol. 133 N° 1 (Janvier 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 1 (Janvier 2011) Titre : An analytical complete model of tilting-pad journal bearing considering pivot stiffness and damping Type de document : texte imprimé Auteurs : Zhiyong Yan, Auteur ; Yi Lu, Auteur ; Tiesheng Zheng, Auteur Année de publication : 2012 Note générale : Tribology Langues : Anglais (eng) Mots-clés : Damping  Elastic  constants  Force  Harmonics  Jacobian  matrices  Machine  bearings  Newton-Raphson  method  Rotors  Vectors  Vibrations Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Considering the freedom of pad tilting and pad translation along preload orientation, an analytical complete model, as well as mathematical method, which contains 2n+2 degrees of freedom, is presented for calculating the dynamical characteristics of tilting-pad journal bearing. Based on the motion relationship of shaft and pad, the local coordinate system, the generalized displacement, and the generalized force vector are chosen. The concise transformation of generalized displacement, generalized force, and its Jacobian matrix between the local and global coordinate systems are built up in matrix form. A fast algorithm using the Newton–Raphson method for calculating the equilibrium position of journal and pads is proposed. The eight reduced stiffness and damping coefficients can be obtained assuming that the journal and all pads are subject to harmonic vibration. Numerical results show that the reduced damping coefficients and the threshold speed can be effectively enhanced by giving suitable pad pivot stiffness and damping simultaneously, and this analytical method can be applied to analyze dynamical behavior of the tilting-pad journal bearing rotor system. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] An analytical complete model of tilting-pad journal bearing considering pivot stiffness and damping [texte imprimé] / Zhiyong Yan, Auteur ; Yi Lu, Auteur ; Tiesheng Zheng, Auteur . - 2012. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 1 (Janvier 2011) Mots-clés : Damping  Elastic  constants  Force  Harmonics  Jacobian  matrices  Machine  bearings  Newton-Raphson  method  Rotors  Vectors  Vibrations Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Considering the freedom of pad tilting and pad translation along preload orientation, an analytical complete model, as well as mathematical method, which contains 2n+2 degrees of freedom, is presented for calculating the dynamical characteristics of tilting-pad journal bearing. Based on the motion relationship of shaft and pad, the local coordinate system, the generalized displacement, and the generalized force vector are chosen. The concise transformation of generalized displacement, generalized force, and its Jacobian matrix between the local and global coordinate systems are built up in matrix form. A fast algorithm using the Newton–Raphson method for calculating the equilibrium position of journal and pads is proposed. The eight reduced stiffness and damping coefficients can be obtained assuming that the journal and all pads are subject to harmonic vibration. Numerical results show that the reduced damping coefficients and the threshold speed can be effectively enhanced by giving suitable pad pivot stiffness and damping simultaneously, and this analytical method can be applied to analyze dynamical behavior of the tilting-pad journal bearing rotor system. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

A simplified one-dimensional thermal model for journal bearings / Daquan Liu in Transactions of the ASME . Journal of tribology, Vol. 130 N°1 (Janvier 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 9 p. Titre : A simplified one-dimensional thermal model for journal bearings Type de document : texte imprimé Auteurs : Daquan Liu, Auteur ; Wen Zhang, Auteur ; Tiesheng Zheng, Auteur Année de publication : 2008 Article en page(s) : 9 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Pressure  Temperature  Equations  Journal  bearings  Bearings  Boundary-value  problems  Temperature  distribution Résumé : The variational approach, which is used to solve the Reynolds equation based on the assumption of constant temperature, is extended to the generalized Reynolds equation calculation. The direct solution method of the generalized Reynolds equation is presented, where the pressure of the nodal points and the cavitation zone boundary of the film can be determined without iterating. A simplified one-dimensional thermal model is built on the basis of the original two-dimensional thermal model. The model not only concerns the thermal effects of the lubricating film, but also offers a direct and rapid numerical algorithm for solving lubricating film temperature field. The numerical results of the temperature distributions for the one model are in good agreement with experiment, and less computing time is needed. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1467960 [article] A simplified one-dimensional thermal model for journal bearings [texte imprimé] / Daquan Liu, Auteur ; Wen Zhang, Auteur ; Tiesheng Zheng, Auteur . - 2008 . - 9 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 9 p. Mots-clés : Pressure  Temperature  Equations  Journal  bearings  Bearings  Boundary-value  problems  Temperature  distribution Résumé : The variational approach, which is used to solve the Reynolds equation based on the assumption of constant temperature, is extended to the generalized Reynolds equation calculation. The direct solution method of the generalized Reynolds equation is presented, where the pressure of the nodal points and the cavitation zone boundary of the film can be determined without iterating. A simplified one-dimensional thermal model is built on the basis of the original two-dimensional thermal model. The model not only concerns the thermal effects of the lubricating film, but also offers a direct and rapid numerical algorithm for solving lubricating film temperature field. The numerical results of the temperature distributions for the one model are in good agreement with experiment, and less computing time is needed. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1467960