73112 - Mechanics and Dynamics of Machines (2nd cycle)

Learning outcomes

The student acquires concepts and advanced methods for the functional design of the machines and is able to deal with issues concerning the modelling of mechanical systems, with reference to multibody systems and mechanical vibration.

Course contents

1. Kinematics of linkages. Planar linkages. The Four-Bar linkage. Analysis versus synthesis. Tasks of Kinematic Synthesis. Graphical synthesis. Analytical synthesis. Motion generation. Path generation. Function generation.

2. Cam design. Introduction. Cam and follower types. Pressure angle. Graphical cam profile synthesis. Analytical cam profile synthesis. Prevention of profile undercutting.

3. Gears. Conjugated profiles. Spur involute gears. Geometry of involute gears. Generation of involute curves by tools. Tooth element proportions. Rack-Cutter. Undercutting. Wildhaber's concept. Modified involute Gears. Involute Helical Gears with parallel axes.

4. Dynamics of Machines and Fundamental of mechanical vibrations.

5. Single Degree of Freedom Systems.

6. Two Degrees of Freedom Systems.

7. N Degrees of Freedom Systems.

8. Continuous Systems.

9. Vibration measurements and modal analysis.

10. Elastodynamic modelling. Lumped parameter modelling of continuous systems and mechanisms. Introduction on the Finite Element Method.

Readings/Bibliography

1. Funaioli E., Maggiore A., Meneghetti U., “Lezioni di Meccanica applicata alle macchine, (I, II e III parte)”, ed. Pàtron, Bologna.

2. Erdman A.G., Sandor G.N., Kota S., “Mechanism Design: Analysis and Synthesis”, Prentice Hall, 4th  edition. ISBN: 0130408727.

3. Norton R.L., “Cam Design and Manufacturing Handbook”, Industrial Press, ISBN: 0831131225.

4. Litvin F.L., Fuentes A., “Gear Geometry and Applied Theory”, Cambridge University Press, 2nd edition. ISBN: 0521815177.

5. Rao S.S., “Mechanical vibrations”, Third edition, Addison Wesley Pub. Company, 1995.

6. Inman D.J., “Engineering Vibration”, Prentice Hall, 1994.

7. Slides and notes from the lessons.

Teaching methods

The lectures will focus on theoretical aspects of the course items. The lectures will be supplemented with practical exercises.

Assessment methods

The final examination is oral and consists of three questions that aim to ensure the acquisition of knowledge expected by the course program and to assess the achievement of learning objectives:

• knowledge of advanced methods for the functional design of the machines;
•  ability to deal with issues concerning the modelling of mechanical systems, with reference to multibody systems and mechanical vibration.

In the course of the examination it will be assessed the ability of the student to resolve new problems or at least to set up the correct resolutive strategy. The assessment of such ability has a fundamental weight in the attribution of the final marks.

To be admitted to the oral examination, students must deliver to the examining commission some solved exercises, as specified in: Esercitazioni_Modalita.pdf

Teaching tools

Blackboard, PC.

The teaching materials shown in class will be available on https://iol.unibo.it (Username and password are reserved for students enrolled at the University of Bologna).

It is suggested that such material to be printed and brought to class.

Links to further information

http://diem1.ing.unibo.it/mechmach/rivola/

Office hours

See the website of Alessandro Rivola