| Titre : | Modified Reynolds equation for aerostatic porous radial bearings with quadratic forchheimer pressure-flow assumption (2008) |
| Auteurs : | Rodrigo Nicoletti, Auteur ; Zilda C. Silveira, Auteur ; Benedito M. Purquerio, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of tribology (Vol. 130 n°3, Juillet 2008) |
| Article en page(s) : | 12 p. |
| Note générale : | Tribology |
| Langues : | Anglais |
| Tags : | Pressure Flow (Dynamics) Porous materials Bearings Equations Stress Stiffness |
| Résumé : | Aerostatic porous bearings are becoming important elements in precision machines due to their inherent characteristics. The mathematical modeling of such bearings depends on the pressure-flow assumptions that are adopted for the flow in the porous medium. In this work, one proposes a nondimensional modified Reynolds equations based on the quadratic Forchheimer assumption. In this quadratic approach, the nondimensional parameter Φ strongly affects the bearing load capacity, by defining the nonlinearity level of the system. For values of Φ>10, the results obtained with the modified Reynolds equation with quadratic Forchheimer assumption tend to those obtained with the linear Darcy model, thus showing that this is a more robust and global approach of the problem, and can be used for both pressure-flow assumptions (linear and quadratic). The threshold between linear and quadratic assumptions is numerically investigated for a bronze sintered porous bearing, and the effects of bearing geometry are discussed. Numerical results show that Φ strongly affects the bearing loading capacity and stiffness coefficients. |
| En ligne : | http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468072 |
