This contribution gives a simple 2-dimensional method to calculate the dynamics of railway tracks which has been checked against the results of completely 3-dimensional finite-element boundary-element calculations. The forces generated by the train are modified, amplified or reduced, by the vehicle-track interaction and the force transfer of the track, yielding the forces that are acting on the ground and exciting the ground-borne vibration. The overall force transfer function is presented for a number of different track systems. Details are given for the track with ballast mats where the influence of wheel mass, track mass, subsoil condition and the stiffness of the mat has been analysed. Two methods are available to calculate tracks with isolation measures, the 3- dimensional finite-element boundary-element method and the simple 2-dimensional beam-on-support method. Results are presented about railway tracks without and with ballast mats. The reduction of the forces acting on the ground is considerable. The influence of a number of parameters is analysed. The most important parameters are the mat stiffness, the track and the wheel mass. The methods have also been applied to other isolation measures at railway tracks such as soft rail pads, elastic sleeper shoes, light-weight floating slab tracks and heavy mass-spring systems. It turns out that each system has a specific frequency range. The system with the lowest vehicle-track eigenfrequency yields the best reduction but is also the most expensive reduction measure. Therefore, the best reduction measure must be chosen according to the situation at hand.
A simple 2-dimensional method for the effectiveness of ballast mats and other isolators of railway vibration
Ein einfaches zweidimensionales Verfahren zur Berechnung der Wirksamkeit von Ballastmatten und anderen Dämmstoffen für Eisenbahnschienenschwingungen
2005
8 Seiten, 6 Bilder, 6 Quellen
Conference paper
Storage medium
English
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