A numerical program for Railway vehicle-track-structure dynamic interaction using a modal substructuring approach

This work presents a program for simulations of vehicle-track and vehicle-trackstructure dynamic interaction . The method used is computationally efficient in the sense that a reduced number of coordinates is sufficient and doesn’t require high efficiency computers. The method proposes a modal substructuring approach of the system by modelling rails , sleepers and underlying structure with modal coordinates, the vehicle with physical lumped elements coordinates and by introducing interconnection elements between these structures (wheel-rail contact, railpads and ballast) by means of their interaction forces. The Frequency response function (FRF) is also calculated for both cases of track over a structure (a bridge, a viaduct ...) and for the simple vehicle-track program; for each case the vehicle effect on the FRF is then analyzed through the comparison of the FRFs obtained introducing or not a simplified vehicle on the system.

ArtMap geo-social street art

Il progetto ArtMap! mette a disposizione un applicativo user, destinato agli utenti, che tramite una struttura a social network, propone una mappatura globale di street art. Viene messo a disposizione un archivio di informazioni, aggiornate direttamente dagli utenti, relative a opere ed artisti e la possibilità di creare itinerari personali. Inoltre, è stato sviluppato un applicativo di supporto per la convalidazione delle informazioni inserite dagli utenti, destinato ai gestori del database di informazioni.