Knowledge of the main principles to study the mechanical components covered during the course. In particular, by the end of the course, students will be able to: • develop a functional model of an electrically driven system: motor, transmission, and mechanical load; • study power transmission through the mechanical components covered, therefore evaluate the resulting forces and torques; • assess the stress state in a transmission shaft resulting from the application of external forces and torques and perform static strength and fatigue checks; • design and verification of the mechanical components presented during the course, namely gears and bearings, as well as coupling systems for transmitting motion between the shaft and connected elements; • evaluate shaft critical speeds and torsional natural frequencies.

The contents of courses as Structural Mechanics and Mechanics of Machines are recommended to effectively follow the course. In particular, basic knowledge of the stress and strain state of elastic solids is assumed, with special reference to the Saint-Venant solid beam theory, as well as free and forced oscillations of single-degree-of-freedom systems, namely harmonic oscillators.

The course aims to provide the skills required to carry out basic design and/or verification of the most common mechanical components found within an electrically driven transmission system. The calculation methods required for the analysis of the selected components will be presented and derived by taking into account the main results of the mechanics of linear elastic continuous bodies and their static and fatigue strength capacity. The course consists of a series of theoretical lectures (45 hours) and a block of practice lessons (15 hours) during which the calculation methods presented will be applied to practical case studies. Course organization • Introduction to the course and application framework of the topics to be addressed • Review of the main results from continuum mechanics • Static strength and fatigue of mechanical components • Gears for motion transmission between transmission shafts • Shaft-hub connections • Rolling bearings • Threaded connections • Dynamic behavior of transmission shafts • Machine monitoring for diagnostic and prognostic purposes. Application of condition monitoring to electric motors.

The total 60 hours of the course are divided between theoretical lectures, approximately 45 hours, and practice lessons, approximately 15 hours, in order to achieve the best balance between knowledge and skills. The theoretical lectures on a given topic will be accompanied by exercises during which students will be required to apply the knowledge acquired to real-world problems. Attendance at lectures and exercises is strongly recommended. The lecturer will be available to provide support throughout the learning process and to clarify any doubts. No intermediate knowledge assessments or group project activities are planned. The lecturer will nevertheless be available for consultation sessions to be arranged in advance by e-mail.

Material used by the lecturers during the lectures, and distributed through the university portal. Additional references can be found below: • R.C. Juvinall, K.M. Marshek, Fundamentals of Machine Component Design, John Wiley & Sons Inc., 5th Ed. 2011. • J.E. Shigley, R.G. Budynas, J.K. Nisbett, Mechanical Engineering Design, McGraw-Hill Education, 11th Ed. 2019. • Childs, P.R.N., Mechanical Design, 2nd Edition, Elsevier, 2004 (also in eBook format, see library website). • Collins, J.A., Failure of Materials in Mechanical Design, 2nd Edition, Wiley, 1993. • Furgiuele, F., Sgambiterra, E., Esercizi di elementi costruttivi delle macchine, Pitagora Editrice Bologna, I Ed. 2022.

Lecture notes; Exercise with solutions ;

Exam: Written test;

Assessment of the achievement of the “expected learning outcomes” listed above is carried out exclusively through a written test. The exam consists of a two-hour written test divided into two parts, designed to assess both theoretical preparation and the ability to apply the calculation methods presented during the course. The two parts consist of: • Part 1: an excercise to be solved following the given instructions • Part 2: a written discussion of a theoretical question During the written test, students may not consult textbooks, handouts, or formula sheets, nor use multimedia devices with web access. During Part 1, the use of a calculator is allowed for carrying out the calculations required by the exercise. The exam is considered passed if the test receives a mark between 18/30 and 30/30, excluding honours, calculated as the arithmetic mean of the marks obtained for the exercise and the theoretical question. Laude is considered in case of excellent results both in Part1 and Part2. The result of the written test will be communicated to students through a notice on the teaching portal. Students will be able to view their tests and the corresponding assessments during a general meeting, the date of which will be communicated through a notice on the teaching portal at the same time as the publication of the written test results.

In addition to the message sent by the online system, students with disabilities or Specific Learning Disorders (SLD) are invited to directly inform the professor in charge of the course about the special arrangements for the exam that have been agreed with the Special Needs Unit. The professor has to be informed at least one week before the beginning of the examination session in order to provide students with the most suitable arrangements for each specific type of exam.