Department of Mechanical Engineering
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Browsing Department of Mechanical Engineering by Author "San Andres, Luis"
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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 00. Introduction to the analysis of vibrations in mechanical systems.(2008) San Andres, LuisIntroduction to motion in mechanical systems. Definition of design, analysis, and testing. Steps in Modeling. Continuous and lumped parameter systems. Second Order Systems and differential equations of motion. Definitions of Free and Forced Responses. The purpose of analysis and the relevant issues to resolve.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 01. Modeling of mechanical (lumped parameter) elements(2008) San Andres, LuisFundamental elements in mechanical systems: inertias, stiffness and damping elements. Equivalent spring coefficients and associated potential energy. Equivalent mass or inertia coefficients and associated kinetic energy. Equations of motion of a rigid body in a plane. Equivalent damping coefficients and associated dissipation energy. Types of damping models (linear or viscous and nonlinear).Item 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 02. Dynamic response of second order mechanical systems(2008) San Andres, LuisItem 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. Elements of analytical dynamics.(2008) San Andres, LuisWork and Energy – Single particle. Constraints – degrees of freedom. Principle of virtual work. D’Alembert Principle. Hamilton Principle. Lagrange’s equations of 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 06. Numerical solution of EOM for a single degree of freedom (SDOF) system(2008) San Andres, LuisItem 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 07. Undamped Modal Analysis of MDOF systems(2008) San Andres, LuisFree & Force Vibrations of undamped MDOF systems. Orthogonality properties of natural modes. Rayleigh energy methods. Mode superposition (displacement and acceleration methods)Item Notes 08. Modal Analysis of MDOF systems with Proportional Damping.(2008) San Andres, LuisItem 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 09. Numerical evaluation of natural modes and frequencies(2008) San Andres, LuisItem 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.