On the study of train-track dynamic interactions caused by rail welds on discrete supported rails

The paper studies the influence of rail weld dip on wheel-rail contact dynamics, with particular reference to freight trains where it is important to increase the operating speed and also the load transported. This has produced a very precise model, albeit simple and cost-effective, which has enabled train-track dynamic interactions over rail welds to be studied to make it possible to quantify the influence on dynamic forces and displacements of the welding geometry; of the position of the weld relative to the sleeper; of the vehicle's speed; and of the axle load and wheelset unsprung mass. It is a vertical model on the spatial domain and is drawn up in a simple fashion from vertical track receptances. For the type of track and vehicle used, the results obtained enable the quantification of increases in wheel-rail contact forces due to the new speed and load conditions.

Arkitektura eskola Pariseko Cathédrales du Rail ondarean

Proiektuak existitzen den ondare handiaren espazioa adaptatzen du arkitektura eskola bat bihurtu dadin. Sistema espazial bat planteatu da, bolumenen berezko ardatzetan oinarritu dena. Orokorrean, bere funtzioa espazio berri itxiak sortzea da monumentaltasuna eta eskala txikituz, uzten den hutsarekin orekan geratuz. Hutsak zein beteak garrantzi berbera dute proposamenean.