ANÁLISIS DE CHUMACERAS INFINITAMENTE LARGAS CON PUERTOS LINEALES HORIZONTALES DE PRESURIZACIÓN

Abstract

In this work we develop a theory for infinitely long bearings with pressurization, by extending the theory that has been developed for the short bearing in previous works. This theory will determine analytically the main rotodynamic features, which are essential to predict the behavior of rotor-bearing system. They show analytical models which could be reached with the help of the Sommerfeld substitution, which will be a vital part in developing this work. It is noteworthy that this work focuses on the analysis of a large bearing linear horizontal ports pressurizing, but have been able to develop mathematical models that allow the analysis to arbitrary ports pressurization. Chapter I provides an introduction to the basics of bearing types and their classification, as well as the types of lubrication that exist. Chapter II looks in detail models of hydrodynamic bearings pressurization; it follows the Reynolds’ equation from Navier-Stokes equations, taking into account the relevant assumptions. Chapter III presents the model solution of a non-pressurized bearing long established in the previous chapter, as well as introduce the model and the solution for a long bearing externally pressurized, obtaining analytical models. With these two solutions will yield the total pressure fields. XII Chapter IV develops the mathematical model to determine the equilibrium position to take the stump in the bearing to be pressurized from two injection ports, the first since the middle right and the second from the left center, this model will consider two possible solutions: the first will be the conditions of Gümbel and the second with the Swift-Stieber conditions, the latter take into account the cavitations that exists in the classical case. Finally in Chapter V presents the graphs of the total pressure fields, after obtaining the attitude angle. It also lists the conclusions that were achieved with the development of this work, as well as possible future work expected to be made to keep track of the theory in this paper was developed.