33946 - Transport Systems Design M

Learning outcomes

The student takes hold of the basic elements for the functional design of propulsion systems of road and rail vehicle. The arguments are therefore developed not only in theory but also, and above all, on the practical design. To this end, the lessons are supplemented by classroom exercises and visits to major automotive companies of the territory.

Course contents

The student who logs on to this teaching has assimilated the basic knowledge concerning the Technique and Transport Economics, usually passing the final exam in three years. For students that haven't the indicated exam in the plan, there is an introductory part of 12 hours of lectures in which the basic concepts necessary to follow the course with profit are recalled.

The student also owns and knows how to use the computer applications of the Office family (Excel, Powerpoint, Word) and is able to generate processed in PDF. All classes are held in Italian. It is therefore necessary to understand the Italian language to successfully attend the course and to be able to use the educational material provided.
Topics include the following:

- General definition of the transport system. Performance of ground vehicles. Functional design and systemic of a transport vehicle.

- Elements of locomotion mechanics. Equation of motion. Resistance to motion. Testing of models. Diagram of traction. Mechanical characteristic.

- Active and passive safety in the automotive sector. Insights on passive safety: design and development of all the principals, historical evolution of the air bag and seat belt.

- Engine. Study of the propulsion system in general. Components of the drive system of land vehicles. Mechanical characteristic ideal. Established 'propulsive. Motor selection.

- Thermal engines. General principles of operation. Efficiency, torque and power of the engine piston and of the turbine engine and their comparison. Outline of external combustion engines. Reciprocating internal combustion engines; Theoretical and real cycles, comparing the various types of engine and particular problems for use in land vehicles: regulation, reverse motion, starter, exhaust brake, boost, pollution. Notes on the Wankel engine. Outline of gas turbines and their use in motor vehicles. Characteristic curves of the various types of engine.

- Electric motors. General principles of operation. Equations characteristics, performance, power limits. Commutator motors. Asynchronous motor. Synchronous motor. Linear motor. Characteristic curves of the various types of engine. Adjustment classical and electronic. Current motors wavy. Outline of rolling policorrente. Notes on electric braking. Vehicles with an electric motor.

- Transmission. General overview. Transmission components: mechanical joints (elastic, universal, constant velocity, friction); hydraulic coupling; gearing (differential, gearbox); modulators (manual gearbox and hydraulic converter). Modulating transmissions for road and rail vehicles: mechanical, hydrodynamic, hydrostatic, electric, mixed. Comparison between different types of transmission.

- Rotate. Features of the pneumatic tire and the wheel train. Adherence. I note on trial.

- Braking. Generality '. Adhesion curves. Correctors braking. Braking distance. Braking devices of road and rail vehicles. Elementary calculations relating to the system of braking.

- Steering. Steering kinematics: band footprint of road vehicles with two or more 'axes. Steering dynamically condition sovrasterzatura and understeer; speed 'criticism. Steering devices of motor vehicles.

- Land systems unconventional. Outline of air-cushion vehicles and a magnetic sustentation.

- Reconstruction of the dynamics and kinematics of road accidents.

- Active and passive safety in rail traffic.

- Tutorials. The functional design of the drive system (motor, transmission, drive wheels) of road vehicles (cars, trucks, buses, electric cars). Design of the braking and steering a road vehicle. Design of a continuous system.

Readings/Bibliography

Texts / Bibliography:
G. Genta, Automotive Mechanics; Evaristo Prince, Understanding vehicles FS for travelers; Evaristo Prince, Understanding FS vehicles for freight transport; A. Orlandi, Mechanics of Transport; L. Plan, the passive safety of vehicles.

Foreign student can use the book: Meccanica dei Trasporti - A. Orlandi.

Teaching methods

The arguments are developed in:

• n° 12+24 teaching hours;
• n° 24 classroom exercises, inwhich are developed numerical exercises concerning the issues dealing in.

Assessment methods

The assessment relates in an interview, in which the candidate undergo three questions, basically on three main areas: technology and economy of transport, mechanical traction, electric traction.

The vote, out of thirty, and 'the sum of the votes in tenths for the three mentioned areas. Constitute the pass mark the foundation of the economy of transport and mastery of concepts related to the normal ideal propulsive, internal mechanical characteristics of the various types of engines and examined the modalities' adaptation to the case.

The candidate may choose the replace one of the three questions with a term paper in-depth on one of the topics covered in class. The dissertation must consist of a paper of 10-15 pages and a powerpoint presentation slides 4-6, to be sent to esame.trasporti@gmail.com box at least 3 days before the examination date. The presentation will be illustrated in the course of the examination with the teacher's PC in a time of about 10 minutes. It will be assessed positively the contribution of original contributions, the exposure and the articulation of language.

The candidate may choose the replace another of the three questions with the words to answer the questionnaire administered by the teacher and with an illustration of collection of numerical exercises developed to class, the candidate will have to carry on examination in the form of typewritten report including calculations, graphics and all theoretical justifications of the case.

The achievement by the student part of an organic vision of the issues addressed at the joint lecture to their critical data use, proof of possession of an expressive and specific language proficiency will be evaluated with marks of excellence. The knowledge for the more 'mechanical and / or mnemonics of matter, ability' of synthesis and non-articulating and / or a proper language analysis but not always appropriate to bring discrete evaluations; training gaps and / or inappropriate language - albeit in a context of minimal knowledge of exam material - will lead to votes that will not exceed sufficiency. training gaps, inappropriate language, lack of orientation within the bibliographic materials offered during the course will only be evaluated negatively.

Teaching tools

Are possible, depending on availability may be collected, educational visits to production and maintenance centers (Ducati, Maserati, Lamborghini, wind tunnel, ...), as well as specialized seminars for professionals working in the field study.

Office hours

See the website of Alfonso Micucci