Class Notes - Modern Lubrication
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San Andrés, L. Modern Hydrodynamic Lubrication Theory, Class Notes (~500 pages) pdf files (Notes 0-16).
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Item Impedance Matching(2020-07-06) San Andres, LuisA short description on what a driver is and what a load is and how to match them. Knowledge that everybody "knows" but no one teaches itItem Notes 00. Introduction to Hydrodynamic Lubrication(2010) San Andres, LuisThe basic laws of friction. Fluid Film Bearings. Basic Operational Principles. Hydrodynamic and Hydrostatic Bearing Configurations. Example of rotordynamic study. Performance objectives.Item Notes 01. The fundamental assumptions and equations of lubrication theory(2009) San Andres, LuisThe fundamental assumption in Lubrication Theory. Derivation of thin film flow equations from Navier-Stokes equations. Importance of fluid inertia effects in thin film flows. Some fluid physical propertiesItem Notes 02. Classical Lubrication Theory(2009) San Andres, LuisDerivation of Reynolds equation for laminar flow bearings. Boundary conditions and types of liquid cavitation.Item Notes 03. Kinematics of motion in cylindrical journal bearings(2009) San Andres, LuisReynolds equation for cylindrical journal bearings. Kinematics of motion and film thickness. Distinction between fixed and rotating coordinates. The pure squeeze velocity vector. Examples of journal motion.Item Notes 04. Static load performance of plain journal bearings(2010) San Andres, LuisThe long and short bearing models. Pressure field and fluid film forces on short length journal bearings. Equilibrium condition, load capacity and the Sommerfeld number.Item Notes 05. Dynamics of a simple rotor-fluid film bearing system(2009) San Andres, LuisEquations of motion of a rigid rotor. The concept of force coefficients. Derivation of stiffness and damping coefficients for the short bearing. Stability analysis and the effect of cross-coupled stiffness. Effect of rotor flexibility on stability and imbalance response.Item Notes 06. Liquid cavitation in fluid film bearings(2009) San Andres, LuisAppropriate boundary conditions for a sound cavitation model. The basics of a universal cavitation model (algorithm).Item Notes 07. Thermal analysis of finite length journal bearings including fluid inertia(2009) San Andres, LuisEvaluation of dynamic force coefficients in finite length bearings using a perturbation of the flow equations. Finite Element models: basic equations and their solution.Item Notes 08. Turbulence flow in thin film bearings : Characteristics and Modeling(2009) San Andres, LuisThe nature of turbulence. Turbulence equations in thin film flows. Turbulence flow models. The bulk-flow model of turbulence, Hirs’ and Moody’s friction factors.Item Notes 09. Fluid inertia and turbulence in fluid film bearings(2009) San Andres, LuisWhen fluid inertia effects are important. Bulk-flow model for inertial flows. Turbulence and inertia in short length journal bearings and open end dampers.Item Notes 10. A thermohydrodynamic bulk-flow model for fluid film bearings(2009) San Andres, LuisThe complete set of bulk-flow equations for the analysis of turbulent flow fluid film bearings. Importance of thermal effects in process fluid applications. A CFD method for solution of the bulk-flow equations.Item Notes 11. High pressure floating ring seals(2009) San Andres, LuisFloating ring seals for compressors: leakage and force coefficients, seal lock up and effect on rotor stability, recommendations to reduce seal cross-coupled effects. Long oil seals as pressure barriers in industrial mixers: leakage and force coefficients, effect on rotor stability, recommendations for grooved seals with reduced leakage and lesser cross-stiffnesses.Item Notes 12. (a) Annular pressure (damper) seals, and (b) Hydrostatic journal bearings(2009) San Andres, LuisThe mechanism of centering stiffness in seals. Force coefficients for short-length pressure seals. Design of annular seals: swirl brakes, impact on rotordynamics. Hydrostatic bearings in modern applications. The principle of hydrostatic lubrication. Effects of recess volume-fluid compressibility on force coefficients for operation at low and high frequencies. Applications of hydrostatic bearingsItem Notes 13. Squeeze Film Dampers (SFDs)(2010) San Andres, LuisAppraisal of the art. Design considerations. Force Coefficients. Lubricant cavitation and air entrainment in SFDs. Response of a Rigid Rotor Supported on open-ended SFDs. (*) Digital video clips showing air entrainment in a SFD available at http://rotorlab.tamu.edu/TRIBGroupItem Notes 14. Experimental identification of bearing force coefficients(2009) San Andres, LuisVariable Filter method for bearing parameter identification.Item Notes 15. Gas Bearings for oil-free MTM(2010) San Andres, LuisAppraisal of the art. Technical Presentation to IFToMM Rotordynamics Conference, Seoul, Korea (Sept, 2010)Item Notes 16. Analysis of tilting pad bearings(2010) San Andres, LuisThe fundaments of analysis – Incomplete document. Presentation.Item THERMO HYDRODYNAMIC (THD) COMPUTATIONAL ANALYSIS FOR TILTING PAD THRUST BEARINGS (TPTBS)(Turbomachinery Laboratory, 2017-05-24) San Andres, Luis; Koosha, RasoolThe report details a thermo-hydrodynamic (THD) analysis for the static and dynamic force performance of TPTBs. The goal is to deliver a modern predictive tool for TPTBs to be further integrated into the XLTRC2 software suite.