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Scheda Riassuntiva
Anno Accademico 2017/2018
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 097556 - GROUND VEHICLE ENGINEERING A
Docente Mastinu Gianpiero
Cfu 10.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA*AZZZZ052298 - GROUND VEHICLE ENGINEERING C
097556 - GROUND VEHICLE ENGINEERING A
097535 - GROUND VEHICLE ENGINEERING B

Programma dettagliato e risultati di apprendimento attesi

 Contents

The design, engineering, construction and operation of ground vehicles is dealt with. Classes are divided into two main parts. In the first part, road and off-road vehicles are presented. In the second part railway vehicles are presented. Students can attend the whole classes (A-10 credits), or only the first part of the course or only the second part of the course ( 5 or 6 credits).

Introduction. Ground locomotion in nature, invention of the wheel and hystorical development of ground vehicles.

Architecture of road, off-road and rail vehicles. Paradigms for designing ground vehicles.

Conceptual design of road vehicles. Geometric dimensions and performance: maximum speed, acceleration, handling, understeering and oversteering  (basics)  as function of vehicle parameters, theory of handling diagrams.

Wheels and suspensions  Tyre: concept design and performance both on road and off-road. Rims: construction details. Suspensions:  McPherson, trailing arm, semi-trailing arm, double wishbone, ‘multi-link’, beam axle (either live or dead).

Springs and Dampers . Torsion springs, flexural springs (leaf), pneumatic springs. motube and twintube dampers, controlled dampers

Steering. Concept design, wheel angles , mechanical systems ( Ackermann, Jantaud), rack & pinion. Powersteering.

Braking. Partition of braking force front to rear, maximum braking power, brake force limiters and EBD, servo brake, ABS, drum and disk brake,  ‘retarder’, band brake

Powertrain and drivetrain. Engine charactristic suited to traction, gearboxes, clutch (single and double), hydraulic torque converter. Differentials (free, torque or speed sensitive, passive or active).

Body. Concept design of body-in-white, materials, construction types.

Lightweight. Concept: energy required to complete a NEDC (New European Driving Cycle). WLTP. Mass properties.

Active, preventive and passive safety for road and off-road vehicles.  

Future trends for road vehicles. New architectures for autonomous (automated) and connected green vehicles, zero fatalities, lightweight and durabilty performance, alternative fuels, electric vehicles, ITS (Intelligent Trasnsport Systems). 

Concept design of a rail vehicle. Gabarit, performance and payload, curve negotiation, derailment (Pochet-Nadal), rolling resistance, running into tunnels.

Wheels and track. Concept and embodiment design, materials, typical loads.

Wheelset.  Concept design, embodiment design, materials, wear, resilient wheels, axleboxes: kinematics, structure, bearings.

Bogies, motor bogies.  Concept design. Single motor and two-motor. Load transfer. Mechanical transmissions.

Body. Concept design, typical loads, embodiment design (European and US), buffers, couplers.

Braking. Fail safe-, automatic-, continuous-, controllable brake. Pneumatic system, triple valve, rheostatic brake, electromagnetic brake (friction or eddy current). Disk brake, clasp (shoe) brake.

Diesel and diesel electric locos. Electric and hydraulic transmission.

Life cycle cost and Reliability, Availability Maintainability.

Future trends for road vehicles. New architectures, lightweight and durabilty performance (lifecycle), safety and security, ITS (Intelligent Trasnsport Systems). 

Technical visits  and seminars are organized (both for road and rail vehicles) to provide in-depth understaning of specific and relevant topics.


Note Sulla Modalità di valutazione

Examination

The exam is oral type. Theory and exercises are equally important. A report collecting exercises and drawings is required. 

 

For 10 credits

Theory. 1 question on road vehicles, 1 question on rail vehicles.

Exercises. 1 question on  road vehicles, 1 question on rail vehicles.

Every question has the same weight for the final mark. 

 

For 5-6 credits

Theory. 1 question on road vehicles

Exercises. 1 question on  road vehicles

Every question has the same weight for the final mark. 

 


Bibliografia
Risorsa bibliografica obbligatoriaLecture notes Beep
Note:

Lecture notes contain what is presented during classes

Risorsa bibliografica obbligatoriaG. Mastinu, M. Ploechl, Road and off-road vehicle system dynamics handbook, Editore: CRC, Anno edizione: 2014, ISBN: 9780849333224 Biblio PoliMi
Note:

E-book available from www.polimi.it

Risorsa bibliografica obbligatoriaS Iwnicki, Handbook of railway vehicle dynamics, Editore: CRC, Anno edizione: 2006, ISBN: 9780849333217 biblio PoliMi
Note:

E-book available from www.polimi.it

Risorsa bibliografica facoltativaM Mitschke, H Wallentowitz, Dynamik der Kraftfahrzeuge, Editore: Springer, Anno edizione: 2008
Risorsa bibliografica facoltativaD Crolla, Encyclopedia of Automotive Engineering, Editore: Wiley, ISBN: 978-0-470-97402-5
Risorsa bibliografica facoltativaG Genta, L Morello, The Automotive Chassis, Editore: Springer, Anno edizione: 2009
Risorsa bibliografica facoltativaL Morello et Al., The automotive body, Editore: Springer, Anno edizione: 2011

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Mix Forme Didattiche
Tipo Forma Didattica Ore didattiche
lezione
48.0
esercitazione
35.0
laboratorio informatico
2.0
laboratorio sperimentale
16.0
progetto
10.0
laboratorio di progetto
24.0

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Area Servizi ICT
29/01/2023