ETD system

Electronic theses and dissertations repository


Tesi etd-04132011-181543

Thesis type
Tesi di dottorato di ricerca
DYNAMIC ANALYSIS OF VEHICLE SYSTEMS Development of a driving simulator Analysis and design of an automatic transmission for motor-scooters
Settore scientifico disciplinare
Corso di studi
tutor Prof. Guiggiani, Massimo
tutor Prof. Frendo, Francesco
Parole chiave
  • motor-scooter
  • powertrain dynamics
  • driving simulator
  • dynamic analysis
  • road safety
  • automatic transmission
  • vehicle model
Data inizio appello
Riassunto analitico
In this work, two researches in the field of dynamic analysis of vehicle<br>systems are presented.<br>The first part of the thesis deals with the development of a driving<br>simulator. This activity was carried out in the framework of a research<br>project co-funded by the Italian Ministry of Education, Universities and<br>Research (MIUR). It aimed at developing a driving simulator for the<br>analysis of the driving style, in order to identify potentially dangerous<br>conditions coming from a non proper interaction between driver, vehicle<br>and environment, especially those related to low driver’s attention. As<br>core part of the driving simulator, a vehicle simulation model, which<br>reproduces the behaviour of the main vehicle systems, was developed.<br>The simulator is made of a fixed driving platform, a single channel visual<br>system and allows to acquire all driver’s inputs and vehicle motion signals.<br>The system was involved in experimental campaigns which allowed the<br>development of the driving style analysis techniques and demonstrated<br>the reliability and the capability of the system.<br>The second part of the thesis treats the dynamic analysis and design<br>of a high efficiency automatic transmission for motor-scooters and was<br>carried out in the framework of the Italian MUSS project funded by the<br>Italian Ministry of Economic Development. Motor-scooters are currently<br>almost always equipped with CVT transmission with rubber belt. This<br>transmission can be very cheap to manufacture, it has good comfort<br>performance but low mechanical efficiency. An alternative automatic<br>transmission was analysed and different architectures were studied. The<br>system is based on a discrete ratio gear box with mechanical control<br>of the gear shit by means of centrifugal clutches and free wheels. A<br>dynamic model of the transmission was developed and its behaviour was<br>investigated by means of results of simulated manoeuvres, highlighting the<br>positive and negative aspects of the system. Finally, a preliminary design<br>was also carried out with reference to an application of the transmission<br>in a hybrid powertrain.