PORTALE DELLA DIDATTICA

### Fundamentals of fluid film lubrication: models and applications

02TBARO

A.A. 2022/23

Course Language

Inglese

Degree programme(s)

Doctorate Research in Ingegneria Meccanica - Torino

Course structure
Teaching Hours
Lezioni 15
Lecturers
Teacher Status SSD h.Les h.Ex h.Lab h.Tut Years teaching
Colombo Federico   Professore Associato ING-IND/13 15 0 0 0 3
Co-lectuers
Context
SSD CFU Activities Area context
*** N/A ***
Il corso intende fornire agli studenti le basi della lubrificazione con fluidi incomprimibili. Le lezioni saranno volte non solo a presentare le equazioni di base, ma anche a fornire una spiegazione fisica di tali equazioni. Verr� anche affrontata la trattazione numerica per la soluzione sia di problemi stazionari che transitori tramite lo strumento Matlab.
The course is intended to furnish to students the basis of theory of fluid film lubrication for incompressible fluids. It will involve both theoretical explanations with simple exercises to apply the basic formulas, and also examples of numerical solutions with Matlab software.
Corso di Meccanica Applicata
Applied Mechanics
Introduzione Regimi di lubrificazione Propriet� fisiche lubrificanti Equazione di Reynolds 1D, soluzione analitica e numerica Equazione di Reynolds 2D, soluzione numerica Problema stazionario e transitorio Identificazione coefficienti di rigidezza e smorzamento cuscinetti rotativi Analisi della stabilit� Applicazioni industriali
Introduction Lubrication regimes Fluid properties( Newtonian fluids, pressure/temperature effect on viscosity) Monodimensional Reynolds equation, examples and exercises Numerical solution Bidimensional Reynolds equation, examples and exercises Numerical solutions for steady and transient problems Perturbation method for dynamic identification of the bearing coefficients Industrial applications (axial thrust bearings, journal bearings, tilting pad bearings, squeeze film dampers) The course will be in English.
In presenza
On site
Presentazione report scritto
Written report presentation
P.D.2-2 - Aprile
P.D.2-2 - April
Lesson 1 � Introduction, lubrication regimes, lubricant properties � Derivation of Reynolds equation Lesson 2 � Physical meaning of terms of Reynolds equation � 1D taper slider and thermal considerations � Proposed exercise in Matlab: o plot pressure distribution, flow rate, load capacity and shear stress o design the 1D taper slider with thermal effect Lesson 3 � Kinematics of journal bearing and fluid film forces � Short JB model with � film cavitation model � Proposed exercise in Matlab: o analysis of steady state motion, pure radial squeeze motion and pure tangential squeeze motion Lesson 4 � Stiffness and damping coefficients for the short JB � Proposed exercise in Matlab: t.b.d. Lesson 5 � Stability analysis � Imbalance response � Proposed exercise in Matlab: t.b.d. Students will be asked to prepare a short report on the proposed Matlab exercises. The credits will be assigned after an oral discussion on the report. A minimum of 3 presences is requested to obtain credits.
Lesson 1 � Introduction, lubrication regimes, lubricant properties � Derivation of Reynolds equation Lesson 2 � Physical meaning of terms of Reynolds equation � 1D taper slider and thermal considerations � Proposed exercise in Matlab: o plot pressure distribution, flow rate, load capacity and shear stress o design the 1D taper slider with thermal effect Lesson 3 � Kinematics of journal bearing and fluid film forces � Short JB model with � film cavitation model � Proposed exercise in Matlab: o analysis of steady state motion, pure radial squeeze motion and pure tangential squeeze motion Lesson 4 � Stiffness and damping coefficients for the short JB � Proposed exercise in Matlab: t.b.d. Lesson 5 � Stability analysis � Imbalance response � Proposed exercise in Matlab: t.b.d. Students will be asked to prepare a short report on the proposed Matlab exercises. The credits will be assigned after an oral discussion on the report. A minimum of 3 presences is requested to obtain credits.