The module aims at providing the basic knowledge for the planning of the main parts of the vehicle (cars and industrial vehicles). In particular those ideas concerning the main subsystems of the chassis (tyres and wheels, suspension, brakes, steering gear) analyzing in detail the functions, the most common structure and constructional solutions and introducing some methods of analysis of their behaviour. The module also has the goal of giving the students the instruments to compute vehicle performance in terms of speed, acceleration fuel consumption and handling.

The studennt is expected to learn a basics knowledge on the working of the basic components of a motor vehicle, including tyres brakes, suspensions, steering. Ability to analize and simulate the main performances of a motor vehicle

The subjects dealt within the modules, Automotive evolution, Technical design, Mathematical analysis I e II, Geometry, Basic Mechanics are considered as a prerequisite for understanding the contents of this module.

1. Introduction Aims and contents of the module. Reference frames for the vehicle and the tires. 2. Forces and moments acting on a vehicle Tire-road contact forces Aerodynamic forces and moments 3. Performance of the vehicle Distribution of ground loads and load transferl Power required for motion Available power Choice of the gear ratios Maximum performance (speed, acceleration, gradeability) Fuel consumption Braking on straight road Kinematic steering and basic handling models 4. Design of the chassis subsystems Constructional details of the most common suspensions for cars and industrial vehicles Basics of elastokinematic analysis of the suspension Constructional details of the most common type of steering gears used for cars and industrial vehicles Basics on the kinematic analysis of the steering gear Constructional details of the components of a hydraulic or pneumatic braking system Elements for the optimal distribution of the braking power on the wheels Bench work and methods of experimentation

Choice of engine and gears ratios necessary to attain the required speed and acceleration; computation of other dynamic performances and analysis of their sensitivity to variation of the design parameters. Computation of the fuel consumption and analysis of its sensitivity to variations of the design parameters. Importance of the kinematics of the suspension and of the points for attachment to the body; calculation of the characteristic angles of the wheel; analysis of the the effect of some geometrical variations. Some projects will be done using the facilities of the computer lab

The recommended reference text is: G. Genta, L. Morello, The automotive Chassis, Springer Useful sources for further closer examinations: Genta, Motor vehicle mechanics, World Scientific, Singapore, 2004 Reimpell & Stoll, The Automotive Chassis, Arnold. Lechner & Naunheimer, The Automotive Transmission, Springer. The texts of the exercises will be made available to the students through the website.

Modalità di esame: Prova scritta (in aula); Prova orale obbligatoria; Elaborato scritto individuale;

Exam: Written test; Compulsory oral exam; Individual essay;

... The exam consists of a written test with 30 multiple choice questions and 8 short exercises. The time allowed for the exam is 2 hours. The student cannot use any written material, like books, notes, etc. The students who pass the written exam with a mark of at least 18/30 can proceed to the oral exam, which may take place in the same day or in the following days. The oral exam is a discussion on the projects made during the course. Such discussion will cause the mark of the written exam to be increased or decreased of a maximum of 2 points. The maximum mark which can be reached with the written exam alone is 23/30, plus the possible 2 marks increase due to the discussion of the projects. To obtain an higher mark, the student must pass an oral exam, consisting in two or three questions, spanning on all the program of the course. The oral exam may last between 15 and 30 minutes. The final mark is the average between the mark obtained at the written and at the oral exams.

Gli studenti e le studentesse con disabilità 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'Unità Special Needs, al fine di permettere al/la docente la declinazione più idonea in riferimento alla specifica tipologia di esame.