|Politecnico di Torino|
|Academic Year 2007/08|
Motor vehicle design
1st degree and Bachelor-level of the Bologna process in Automotive Engineering - Torino
Objectives of the course
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 student is expected to learn a basics knowledge on the working of the basic components of a motor vehicle, including tyres brakes,
Ability to analyse and simulate the main performances of a motor vehicle
The subjects dealt with in the modules 'The car and its evolution', Technical design, Mathematical analysis I e II, Geometry, Basic
Mechanics are considered as a prerequisite for understanding the contents of this module.
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
Choice of the gear ratios
Maximum performance (speed, acceleration, gradeability)
Braking on straight road
4. Design of the chassis subsystems
Use of CAD systems
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
Laboratories and/or exercises
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 (in collaboration with the module Assisted Design ).
The teaching personnel will make themselves available to the students, at stated times, in order to supply explanations and to informally
verify the level of learning.
The recommended reference text is:
Genta, Motor vehicle mechanics, World Scientific, Singapore, 2004
Useful sources for further closer examinations:
Reimpell & Stoll, The Automotive Chassis, Arnold.
Lechner & Naunheimer, The Automotive Transmission, Springer.
Morelli, Progetto dell'Autoveicolo-Concetti di Base, Celid.
The didactic material used during the lessons will be made available to the students in the form of CD ROM, with illustrations, diagrams
and notes on concepts that have been explained during the lessons.
The exam consists of a written test at the end of the module and a discussion and evaluation of the training carried out.
Programma provvisorio per l'A.A.2005/06