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Troubleshooting in Studying the Behavior of Ballast Stones using Molecular Dynamic Simulation
Author(s) -
Mircea Alina,
Popp Karl
Publication year - 2005
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200510082
Subject(s) - ballast , track (disk drive) , troubleshooting , range (aeronautics) , computer science , marine engineering , simulation , engineering , mechanical engineering , electrical engineering , aerospace engineering , reliability engineering
For the safety of the railways very important, beside tracks and trains, is the behavior of ballast stones. In the last years many scientists have started to investigate the behavior of the ballast stones and the parameters that influence them. In order to describe this behavior, one can choose a continuum mechanical description of the system or a discrete one. The problem with the first method is that the material parameter set depends on stone geometry, humidity and further factors. The second method (also called Molecular Dynamic Method MDS) makes possible a close‐to‐reality rendition of each ballast stone by means of numeric time step integration. We use MDS in order to built up a model for the system ballast stones ‐ track. Through our model we analyze small ballast stones range like under a magnifying glass. The ballast stones appear as polygons with a number of corners between 5 and 8, written in ellipses, and a size of 2 to maximally 6.3 cm. In the first step the model B70 has been selected for the track and the parameter of the model has been investigated. In the second step the program became more flexible and one can decide if the system consists from one track and ballast stones or from two tracks and ballast stones. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)