When a vehicle runs over the connection between a floating slab track (FST) and ballasted track, wheel/rail impact may occur because of the stiffness difference in the two kinds of track, and thus a transition sector is usually included at the connection to smoothen the stiffness change. This phenomenon is studied by numerical simulation using a time-domain model for an idealised case without such a transition to determine whether it is actually necessary. Calculation results show that the rail/wheel impact load is moderate for a light FST and increases with the vehicle speed or decreasing the natural frequency of the FST. From simulation the wheel/rail parametric excitation is observed, as a result of variation in the stiffness of the FST with the period of the single slab length. The wheel/rail load due to the parametric excitation also increases with the vehicle speed. In addition, good performance of vibration isolation can be seen for the FST in terms of the force transmitted to the infrastructure.
On vehicle/track impact at connection between a floating slab and ballasted track and floating slab track's effectiveness of force isolation
Fahrzeug-/Gleis-Stoß an der Verbindung zwischen einer Gleistragplatte und fester Fahrbahn sowie Wirksamkeit des schwimmenden Gleiskörpers bezüglich der Schwingungsisolierung
Vehicle System Dynamics ; 47 , 5 ; 513-531
2009
19 Seiten, 15 Bilder, 2 Tabellen, 19 Quellen
Article (Journal)
English
mechanischer Stoß , Gleis , Eisenbahnschiene , Wirksamkeit , Schwingungsisolierung , mechanische Schwingung , Schwingungsverhalten , Fahrgeschwindigkeit , numerische Simulation , Gleismaterial , Eisenbahnfahrzeug , Resonanzfrequenz , Zeitbereichanalyse , parametrische Anregung , Eisenbahnrad , Krafteinleitung , Anwendung im Fahrzeugbau , Fahrzeugdynamik
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