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Fundamentals of machine design

02SXJLI, 02SXJLN

A.A. 2024/25

Course Language

Inglese

Course degree

1st degree and Bachelor-level of the Bologna process in Ingegneria Dell'Autoveicolo (Automotive Engineering) - Torino
1st degree and Bachelor-level of the Bologna process in Ingegneria Dell'Autoveicolo - Torino

Course structure
Teaching Hours
Teachers
Teacher Status SSD h.Les h.Ex h.Lab h.Tut Years teaching
Teaching assistant
Espandi

Context
SSD CFU Activities Area context
ING-IND/14 8 B - Caratterizzanti Ingegneria meccanica
Valutazione CPD 2021/22
2022/23
The course aims at providing further knowledge to what was learned in the base courses of mechanical and automotive design. In particular, the course provides the fundamentals of machine component design and analysis, with selected reference to machine components used in vehicles and to their integration into complex systems. of One of the course objectives is the application of previously acquired knowledge on the strength of materials under static, dynamic, thermal and fatigue loads to the design of the machine components.
The course aims at providing further knowledge to what is taught in the base courses of mechanical and automotive design. In particular, the course provides the fundamentals of machine component design and analysis, with selected references to machine components used in vehicles and to their integration into complex systems. One of the course objectives is the application of the knowledge previously acquired on strength of materials - under static, dynamic and fatigue loads - to the design of the machine components.
Students are expected to acquire the knowledge related to the methodologies for the design of some of the most relevant machine components and of mechanical systems, with particular reference to the automotive engineering, taking into account the different types of applied loads (mission) and their interaction with other parts of the same machine (system).
Knowledge General methodologies of design for strength of some of the most important machine components and mechanical systems, with particular reference to the automotive sector, taking into account the different types of applied loads (mission) and their interaction with the other parts of the same machine (system). Behaviour of the threaded joints Behaviour of the welded joints Behaviour of the torsional and bending springs Types and usage of the rolling bearings Behaviour and main properties of the spur gears Skills Designing a shaft (or equivalent part) with respect to fatigue Designing a threaded joint Designing a welded joint Designing a torsional or bending spring Choosing the required set of rolling bearings for the required loading conditions and life Designing spur gears
Engineering drawing, Fundamentals of strength of materials, Applied mechanics, Science and technology of materials or Technology of metallic materials.
Engineering drawing, Fundamentals of strength of materials, Applied mechanics, Science and technology of materials or Technology of metallic materials.
Strength of materials: ? Recall of the calculation of equivalent stress and possible failure modes ? Recall of fatigue strength of materials; factors influencing the fatigue life, fatigue characteristic data and standard diagrams; stress concentration due to notches; load time histories, damage and damage accumulation. ? Hertz theory for the calculation of the contact pressure, strength of materials to contact loads and wear problems Mechanical joints: ? Threaded joints, axial load and tightening torque, static and fatigue design. ? Welded joints: weld types made by arc welding, static and fatigue verification according to the normative, typical defects and evaluation of the weld class. Machine elements and their design: - Roller bearings: selection in the catalog, equivalent load, life estimation, lubrication, assembly and site preparation; ? Mechanical springs: Torsion bars, cylindrical helical springs, lamina spring and leaf springs, conical disc springs; ? Notes on friction clutches; ? Transmission joints: articulated, universal and homokinetic joints; ? Cylindrical spur gears, tooth involute profile, modular geometry, length of the contact path, transmission ratio, specific sliding coefficients, gear tooth bending and surface fatigue failure, criteria for the selection of the module.
Strength of materials: - Recall of the calculation of the equivalent stress and possible failure modes - Recall of fatigue strength of materials; factors influencing the fatigue life, fatigue characteristic data and standard diagrams; stress concentration due to notches; load time histories, damage definition and accumulation. - Hertz theory for the calculation of the contact pressure, strength of materials to contact loads and wear problems Mechanical joints: - Threaded joints, axial load and tightening torque, static and fatigue design. - Welded joints: weld types made by arc welding, static and fatigue verification according to the standards, typical defects and evaluation of the weld class. Machine elements and their design: - Rolling bearings: selection in the catalogue, equivalent load, life estimation, lubrication, assembly and site preparation; - Mechanical springs: torsion bars, cylindrical helical springs, lamina spring and leaf springs, conical and disc springs; - Notes on friction clutches; - Transmission joints: articulated, universal and homokinetic joints; - Cylindrical spur gears, tooth involute profile, modular geometry, length of the contact path, transmission ratio, specific sliding coefficients, gear tooth bending and surface fatigue failure, criteria for the selection of the module.
The course is organized in theoretical lectures and classroom practices/tutorials. During the tutorials in the classroom, the students will develop exercises on the topics covered during lectures. Students will also be asked to develop small projects related to motor vehicle components and subsystems, applying in a comprehensive/integrated way some of the methods for design and verification explained during the course.
The course is organised in theoretical lectures and classroom tutorials. The lectures are devoted to the presentation of the physical aspects and the solution methods involved in the design of machine and automotive parts. During the tutorials in the classroom, the students see the solution of examples related to the topics covered by the lectures. Students are also asked to develop the solution of small problems related to vehicle components and subsystems, applying in a comprehensive/integrated way the methods for design and verification explained in the course.
Slides and notes will be made available to students Even if there is not a textbook covering all the subjects developed during the course, the following books are recommended as useful readings: - A.R. Juvinall, K.M. Marshek - "Fundamentals of machine component design", Wiley - M. Rossetto - "Introduzione alla fatica", ed. Levrotto & Bella, Torino - J. Bannantine ? ?Fundamentals of metal fatigue analysis?, Prentice Hall 1990 Further reference books - R. Giovannozzi - "Costruzione di Macchine", ed. Patron, Bologna - J.A. Collins - "Failure of materials in mechanical design", ed. Wiley, New York - Wahl - "Mechanical springs"
Lecture slides and course notes will be made available to the students. Even if there is no textbook covering all the subjects developed during the course, the following books are suggested as useful readings: - A.R. Juvinall, K.M. Marshek. "Fundamentals of machine component design", Wiley 1991 - J. Bannantine. "Fundamentals of metal fatigue analysis", Prentice Hall 1990 Further reference books - J.A. Collins. "Failure of materials in mechanical design", Wiley, New York 1993 - Wahl "Mechanical springs", SMI 1963
ModalitÓ di esame: Prova scritta (in aula); Prova orale facoltativa;
Exam: Written test; Optional oral exam;
Gli studenti e le studentesse con disabilitÓ o con Disturbi Specifici di Apprendimento (DSA), oltre alla segnalazione tramite procedura informatizzata, sono invitati a comunicare anche direttamente al/la docente titolare dell'insegnamento, con un preavviso non inferiore ad una settimana dall'avvio della sessione d'esame, gli strumenti compensativi concordati con l'UnitÓ Special Needs, al fine di permettere al/la docente la declinazione pi¨ idonea in riferimento alla specifica tipologia di esame.
Exam: Written test; Optional oral exam;
The final exam evaluates the level of competence acquired in machine design, in terms of skill in solving design problems and knowledge of the relevant phenomena and methods. It consists of a compulsory written part and an elective oral part. The written part foresees the solution of a problem on the design and verification of automotive components. The involved problem size and difficulty are of the same type of the those proposed in the tutorials. During the written exam the student may use for consultation purpose books, lecture slides and tutorial materials, as long as in hard-copy form (the use of electronic devices such as tablets or laptops is not admitted). The allowed time is 120 minutes. The evaluation of the written test is based on a 24-point scale, and represents the final grading of the exam if the oral part is not taken. To pass the written test, the student must obtain a sufficient evaluation for each main subject of the problem. In order to take the oral exam, the student is required to have passed the written test. The oral has the goal to assess the knowledge on machine design. The student is asked to answer the questions basing her/his reasoning on formulas, charts and diagrams. The ability to explain technical constructive solutions by means of handmade sketches is also of high importance. The final grading is expressed taking as starting point the result of the written test, from which the variation (increment or decrement) due to the oral exam is considered (max possible grading: 30 cum laude). The written and oral parts of the exam must be taken in the same session. Booking through the portal is mandatory.
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.
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