57110 - Mechanics and Mechanical Systems

Learning outcomes

At the end of the module, the student is familiar with the basic principles of statics and mechanical systems; he/she is able to solve problems relating to the composition of mechanisms, forces acting on machines, efficiency, contact forces between solids, rigid body kinematics and its application to mechanisms, articulated systems. He acquires the basic knowledge for the functional analysis of machines and mechanisms.

Course contents

Forces: composition of several forces in the plane and in space, weights and barycentres, Guldino's theorems, exercises. Moments and pairs: moments of forces, pairs of forces, static moments, exercises. Bound bodies: forces applied to rigid bodies, equilibrium of bound bodies, calculation of reactions in an isostatic structure, graphic procedures, equilibrium of bodies subject to their own weight, trusses, exercises. Simple machines: levers and machines derived from them, hoists and winches, inclined plane, wedge screw, exercises. Friction: sliding friction, in pivots, rolling friction, winding friction, exercises. Consequences of friction: real constraints, brakes, friction clutches, efficiency. Hydrostatics: characteristics of fluids, hydrostatic pressure, hydrostatic thrust, principles: Pascal's, Archimedes', communicating vessels, exercises. Hydrodynamics: current regimes, continuity equation, Bernoulli's theorem, pressure drops, Torricelli's formula, exercises. Channels and pipes: pressure drops in channels and pipes, Darcy's formula, exercises.

Readings/Bibliography

Teaching materials deemed useful for preparation and supplementation will be available from the instructor and provided directly to students.

Teaching methods

A comprehensive overview of the laws of statics of constrained bodies will be presented. Special attention will be paid to the problems of the resistance of the medium, with particular emphasis on the practical consequences of friction. In addition, problems of hydrostatics and applied hydrodynamics will be addressed. For greater involvement during the lecture and to promote learning of the new content, explanatory images and graphs will be projected and made available to the students.

Assessment methods

The examination in "Mechanics, technology and design" consists of an oral test.

All tests are in-person. Please note that the online mode will be activated in case of emergency by communication from the University of Bologna

The tests can be taken on the same data, or in two different data (January-February; June-July; September: December).

The final test consists of an oral interview on the topics covered in the course syllabus.

The examination will also include questions designed to test:

- the level of depth of the topic presented;

- the knowledge of the other contents of the program;

- the ability to make logical-deductive connections between different topics;

- the degree of organic understanding of the topics covered during the lectures.

For the assessment of the student's/student's preparation, the lecturer may use additional questions aimed at analyzing aspects related to the main topics. The following will be assessed: the ability to expound correctly, completely and critically on the required topics; the clarity of exposition and the ability to use the specific language of the discipline.

Criteria for awarding final grade:

• 18-19: preparation on a very limited number of topics; ability to analyze present only with teacher support; overall fairly correct use of language.
• 20-24: preparation on a limited number of topics; ability to analyze independently confined to executive issues; correct language.
• 25-29: preparation on a wide range of topics; ability for independent critical analysis; good command of specific terminology.
• 30: Comprehensive preparation on all course topics; critical autonomy in analysis and connections between contents; full command of disciplinary language and argumentative and reflective ability.
• 30 cum laude: organic and integrated view of the topics covered; critical and informed use of knowledge; ability to make articulate connections; excellent mastery of expression and language, including specific terminology.

Students with learning disorders and temporary or permanent disabilities are invited to contact the dedicated office (https://site [https://site/] .unibo.it/students-with-disabilities-and-dsa/en/for-students) as soon as possible so that appropriate compensatory measures can be agreed upon. The request must be submitted in advance (15 days before the date of the exam) to the teacher, who will assess the appropriateness of the measures taking into account the teaching objectives.

Attribution of the overall mark for the Integrated Course (CI): The final mark will be determined by the weighted average of the marks obtained in the individual modules, based on the number of credits (CFU) attributed to each of them.

In order to take the exam, registration is required through the Almaesami registration, in strict compliance with the deadlines. Lists on Almaesami close two days before the start of each appeal.

Teaching tools

During the lessons, PowerPoint presentations and educational videos will be shown and exercises done on the blackboard.

Office hours

See the website of Alessandro Bettini