INGEGNERIA CIVILE E ARCHITETTURA (DICAR)Mechanical EngineeringAcademic Year 2022/2023

9796119 - MACHINE DESIGN

Teacher: Guido LA ROSA

Expected Learning Outcomes

Based on the concepts acquired in Structural Mechanics and Applied Mechanics, we will provide the basis for the design of components and simple mechanical systems.

Course Structure

Frontal lessons and exercises on the topics of the course. The course will deals with study and design of mechanical components either on static or dynamic conditions.

Required Prerequisites

Fundamental of Resistence of Material and Applied Mechanics are required.

Attendance of Lessons

According to regulation, compulsory attendance for 70% would be required. However, due to the protracted restrictions for COVID, the attendance of the course will follow the instructions given by the Rector on this topic.

Detailed Course Content

Technical project. Singular functions. Materials Testing.

Beams, diagrams of T and M.

Equivalent stresses.

Material fatigue.

Integrated design. Ecodesign.

Selection of materials.

Cumulative damage. Thermographic method.

Notch effects.

Damping.

Springs.

Leaf springs of rod holders. Springs with progressive stiffness.

Coil springs. Torsion springs.

Conical torsion springs.

Ring-shaped springs.

Tubes.

Forced shaft-hub connections. Forced connections plate-fly.

Tabs, keys. splined couplings.

Lubrication: general equations.

Thrust bearing. Plain bearing.

Theory of Hertz. Stribeck formula.

Rolling bearings.

Flanged joints. Flexible couplings. Bibby joint. Voith-Maurer joint.

Universal joint. Oldham coupling.

Gears. Thickness of the tooth. Schiebel fitting.

Minimum number of teeth. specific sliding.

Gears design. dynamic correction of the allowable voltage. Bending calculation. Wear calculation. Correct gears.

Grafts.

Exercises on the design and verification of the mechanical parts.

Textbook Information

1. R. Giovannozzi. Costruzione di Macchine. Patron Editore.

2. A. Risitano. Mechanical design. CRC Press.

3. Budinas: Shigley's Mechanical Engineering Design. McGraw-Hill.

4. Funaioli: Meccanica applicata alle macchine. Patron. Vol. I.

Course Planning

	Subjects	Text References
1	Funzioni singolari, Virtual Works Principle.	Shigley.
2	Tensioni ideali.	Giovannozzi, Risitano, Shigley, teaching notes.
3	Fatica dei materiali, macchine di prova, effetti di intaglio	Giovannozzi, Risitano, teaching notes.
4	Progettazione integrata, selezione dei materiali.	Teaching notes.
5	Shafts and axels.	Giovannozzi, Risitano, teaching slides.
6	Molle.	Giovannozzi, Risitano, teaching notes.
7	Ruote dentate.	Giovannozzi, Risitano, teaching notes.
8	Hertz's theory.	Giovannozzi, Risitano, teaching slides.
9	Giunti, innesti.	Giovannozzi, Risitano, teaching notes.
10	Tubi, collegamenti forzati.	Giovannozzi, Risitano, teaching notes..
11	Lubrificazione.	Giovannozzi, Risitano, Funaioli, teaching slides.
12	Rolling bearings.	Giovannozzi, Risitano, teaching slides.

Learning Assessment

Learning Assessment Procedures

Presentation of a group project related to an assembly with the dimensioning of some mechanical components.

Oral examination.

Examples of frequently asked questions and / or exercises

Project of gears systems and mechanical components.

Shafts design under torque and bending moment.

Mechanical components design: springs, joints, frictions, brakes.

Forced connections.

Fatigue of the materials.

Versione in italiano