MECHANICS OF MACHINES (B)
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- Versione italiana
- Academic year
- 2015/2016
- Teacher
- GIORGIO DALPIAZ
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/13
Training objectives
- The course provides the knowledge and methods for the functional synthesis of machines; in particular it deals with lubrication, gears and gear trains, as well as vibrations of single degree of freedom systems (vibration isolation).
The course takes into account both the theoretical and the applicative point of view and includes numerical exercises. Prerequisites
- Courses of Mathematics, Physics and Theoretical Mechanics.
Course programme
- The course lasts 48 hours, including lessons and exercises.
The course topics are the following.
TRIBOLOGY AND LUBRICATION: Friction and wear in sliding and rolling contacts. Lubricant viscosity and properties. Elementary theory of hydrodynamic lubrication; technical applications. Journal bearings: theory and design (use of Raimondi-Boyd diagrams). Hydrostatic lubrication; technical applications. Performances and applications of bearings.
GEARS AND GEAR TRAINS: Spur gears: properties of the involute, velocity ratio, static analysis, manufacturing processes, contact ratio and interference, dimension standards, non-standard gear teeth, gear measurements. Helical gears. Bevel gears. Worm gears. Ordinary gear trains. Planetary gear trains. Differential gear systems. Torque relationships in gear systems.
VIBRATIONS OF SINGLE DEGREE OF FREEDOM SYSTEMS: Free vibrations. Forced vibrations. Vibration isolation. Didactic methods
- Theoretical and practical lessons; the practical lessons concern numerical exercises on component design and selection.
Learning assessment procedures
- Written/oral examination. It consists in three questions: two questions are theoretical and methodological, mainly aimed at assessing the knowledge; one question is a numerical exercise, mainly aimed at checking skills in the procedures for dimensioning and selection of components. The questions are carried out in writing and are immediately corrected and discussed orally. The rating assigned to each question refers to both written and oral performances. The final grade concerning the integrated course of Mechanics of Machines A+B is the average of the votes obtained in the written examination of module A and in the written/oral questions. To pass the exam you must achieve a minimum final grade of 18/30.
Reference texts
- - Funaioli, A. Maggiore, U. Meneghetti, Lezioni di Meccanica applicata alle macchine. Prima parte: Fondamenti di meccanica delle macchine, Patron, Bologna, ISBN 88-555-2829-7, 2005 [Vol. I].
- Paolo Righettini, Guido Ruggieri, "Ruote dentate con spostamento del profilo", ISBN: 88 386 6135-9, aprile 2003, McGraw-Hill Companies, S.r.l., Milano
- Ghigliazza R., Galletti C.U., "Meccanica applicata alle macchine", UTET, Torino, 1986.
- Waldrom K.J., Kinzel G.L., "Kinematics, Dynamics, and Design of Machinery", John-Wiley & Sons, 1999.
- Uicker, J.J., Pennock, G.R., Shigley, J.E., "Theory of Machines and Mechanisms", Oxford University Press, terza edizione 2003, ISBN 0 19 515598 X
- Doughty, S., "Mechanics of Machines", John-Wiley & Sons, 1988;
- Paul, B., "Kinematics and dynamics of planar machinery", Prentice-Hall, 1979.
