Unit MECHANICS OF MACHINES
- Course
- Mechanical engineering
- Study-unit Code
- 70367210
- Curriculum
- Generale
- Teacher
- Giordano Franceschini
- CFU
- 10
- Course Regulation
- Coorte 2019
- Offered
- 2020/21
- Type of study-unit
- Obbligatorio (Required)
- Type of learning activities
- Attività formativa integrata
APPLIED MECHANICS
| Code | 70153005 |
|---|---|
| CFU | 5 |
| Teacher | Giordano Franceschini |
| Teachers |
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| Hours |
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| Learning activities | Caratterizzante |
| Area | Ingegneria meccanica |
| Academic discipline | ING-IND/13 |
| Type of study-unit | Obbligatorio (Required) |
| Language of instruction | Italian |
| Contents | The main analytical, graphic and experimental tools for the static and kinematic study of the mechanisms, with determination of the actions on all components making up the machine; knowledge of the main articulated and motion transmission systems. Dynamic and vibration analyses are instead dealt with in Module B. |
| Reference texts | Funaioli, Maggiore, Prosciutto - Meccanica Applicata alle Macchine - Ed. Patron. Belfiore, Di Benedetto, Pennestrì - Fondamenti di Meccanica Applicata alle Macchine - Ed. Ambrosiana. Course lecture notes. |
| Educational objectives | Mastery with the main methods of studying mechanisms. Knowledge of the main mechanisms and their characteristics, with particular reference to motion transmission systems, articulated systems, mechanisms with cams, gear wheels, wear mechanisms. |
| Prerequisites | Passing the exam of Rational Mechanics, as well as a good knowledge of: Physics 1, of some topics of Geometry, of vector calculus and, in some cases, of technical drawing. |
| Teaching methods | Frontal lessons with graphic, analytical and computer exercises. |
| Other information | None. |
| Learning verification modality | Written exercise, aimed at verifying the candidate's ability to write a discussion on one of the course topics, complete with theoretical premises, demonstrations, numerical verification and any supporting graphics or drawings, also assessing their degree of general organization. An oral question may follow the written test if the teacher deems it necessary. During lessons, the teacher will organize one or more written exoneration tests, independent of the prerequisites, the success of which exempts from carrying out the final written test. |
| Extended program | Generality, kinematic pairs, kinematic chains, mechanisms. Friction. Coefficient and Friction angle. Models of the phenomenon of wear of a single surface. Reye's hypothesis. Examples (thrust pin, single disc clutch and brakes). Drum brakes and Romiti circumference. Notes on the theory of lubrication. Works and yields. Direct and retrograde motion. Spontaneous arrest mechanisms. Friction in the main kinematic pairs. Articulated systems. Generality. Graphic study and examples of analytical study. Graphic study of the articulated quadrilateral. Graphic and analytical study of pin - rod mechanisms. Cam mechanisms - tappet. Verification and summary. Transmission ratio and homokineticity. Cardan joint, Oldhan joint, homokinetics.joint General information on motion transmission between parallel, incidental or skew axes. Primitives and matching friction wheels. Introduction to tracking toothed wheels. Involute concept. Properties of involute cylindrical gear wheels. Notes on the main checks (interference, continuity, static failure, fatigue with Hertzian contact theory). Tracking criteria for gear wheels. Form, addendum, dedendum, cut from denture. Sprocket efficiency. Simple sizing and gearboxes reducers and multipliers. Helical gear wheels. Notes on tapered gear wheels and helical wheels for skewed axles. Notes on epicyclic gears. Pulley belt mechanisms. Hoists and differential hoist. Transmission with belts. Equation. Yield. Tension issues. |
MECHANICAL VIBRATIONS
| Code | 70153105 |
|---|---|
| CFU | 5 |
| Teacher | Maria Cristina Valigi |
| Teachers |
|
| Hours |
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| Learning activities | Caratterizzante |
| Area | Ingegneria meccanica |
| Academic discipline | ING-IND/13 |
| Type of study-unit | Obbligatorio (Required) |
| Language of instruction | Italian |
| Contents | -Vibrations with 1 dof -Free vibrations -Forced vibrations -Transmissibility -Suspension optimization -Reduction of vibrations generated by a vibrating ground -Vibration with 2dofs -Vibration with n dofs -Modal Analysis -Balancing -Rotordynamics |
| Reference texts | -Umberto Meneghetti, Alberto Maggiore, Ettore Funaioli"Lezioni di meccanica applicata alle macchine. Vol. 1: Fondamenti di meccanica delle macchine." -S.Papini, M.Malvezzi,M.C.Valigi "Esercitazioni di meccanica applicata alle macchine: vol.2 Ed.Esculapio -Massimo Callegari , Pietro Fanghella , Francesco Pellicano "Meccanica applicata alle macchine" |
| Educational objectives | Basic knowledge of dynamics and vibrations needed to describe the dynamic behavior of a mechanical system. Ability to study mechanical vibrations, the causes that determine vibrations and the effects caused by them. |
| Prerequisites | Physics-Theoretical mechanics |
| Teaching methods | Face-to-face theoretical lessons and exercises |
| Other information | Attending students have the possibility of examination in itinere. |
| Learning verification modality | Oral examination and exercises. |
| Extended program | -Vibrations with 1 dof -Free vibrations -Forced vibrations -Transmissibility -Suspension optimization -Reduction of vibrations generated by a vibrating ground -Vibration with 2dofs -Vibration with n dofs -Modal Analysis -Balancing -Rotordynamics |