Feasibility of Applying Controllable Lubrication to Dynamically Loaded Journal Bearings

Edgar Alberto Estupinan, Ilmar Santos

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


A multibody dynamic model of the main mechanical components of a hermetic reciprocating compressor is presented in this work. Considering that some of the mechanical elements are interconnected via thin fluid films, the multibody dynamic model is coupled to the equations from the dynamics of the fluid films, based on fluid film theory. For a dynamically loaded journal bearing, the fluid film pressure distribution can be computed by numerically solving the Reynolds equation, by means of finite-difference method. Particularly, in this study the main focus is on the lubrication behavior of the upper and lower bearings of the crankshaft, when the system operates under passive and active lubrication conditions. It is thought that the dynamics of the fluid films can be passively or actively controlled by means of different types of actuators, allowing significant reduction in the vibration levels, wear and power losses of the system components. From the point of view of actively controlled lubrication and specifically for the case of dynamically loaded journal bearings, the injection pressure should be controlled in time domain. However, taking into account that the gas pressure and reaction forces in a reciprocating compressor have a cyclic behavior, periodic oil pressure injection rules based on the instantaneous crank angle and load bearing condition can be established. In this paper, several bearing configurations working under different oil pressure injection rules conditions are analyzed. The behavior of the following parameters is investigated when the system operates with hybrid controllable lubrication conditions: a) maximum fluid film pressure, b) minimum fluid film thickness, c) maximum vibration levels and d) injection oil pressures.
Original languageEnglish
Title of host publicationProceedings of the XIII International Symposium on Dynamic Problems of Mechanics
Publication date2009
Publication statusPublished - 2009
EventXIII International Symposium on Dynamic Problems of Mechanics - Angra dos Reis, RJ, Brazil
Duration: 2 Mar 20096 Mar 2009
Conference number: 13


ConferenceXIII International Symposium on Dynamic Problems of Mechanics
CityAngra dos Reis, RJ


  • fluid film bearings


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