The growing railway traffic causes increasing sound emission. Therefore Deutsche Bahn AG makes every effort to reduce the sound emission, especially of K-blockbraked freight trains, even if the requirements of operation make it difficult to develop a new wheel design regarding the acoustical needs by meeting the given structural and thermal properties. A good possibility to reduce the sound radiation is to fix absorbers to the wheel. In contrary to disc-braked wheels used in conventional rolling stock, freight trains are mostly equipped with brakes acting on the running surface. So, absorbers for blockbraked wheels have not only to withstand high temperatures but they have to be functional despite such temperatures. Within the EU-Project SILENCE developed in cooperation with Deutsche Bahn the absorber system Hypno which consists only in steel components in order to withstand the thermal loads This paper presents the w orking mechanism of the damping device as well as the calculations performed using the Finite Element Method (FEM) tool Ansys to estimate the acoustical effects due to this absorber. Since measurements on the first prototype of this absorbing system showed good damping and noise reduction effects, calculations performed with the finite element method concentrate on the particular case that the absorbing plates are coupled which may describe a certain kind of dysfunction due to extreme weather conditions in winter like ice, or rusty surfaces of the absorbing plates. That condition can be handled as a worst case state of the damping system on which the investigations are focused. First the damping system Hypno and its function will be presented. In the next section the finite element model of the wheel with mounted damping system will be described. The major part afterwards is focused on the calculations performed with the finite element method especially for the condition of rigidly coupled absorber plates. The possibility of calculating the damping effect of the device with working absorber plates gliding against each other will be discussed in the outlook.
Optimization of a wheel damper for freight wagons using FEM simulation
2008
7 Seiten, 7 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
Optimization of a Wheel Damper for Freight Wagons Using FEM Simulation
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