Computational Technology Resources - IJRT

Keywords: conformal contact, elastic contact, contact algorithms failure, railway vehicles simulation, wheelset derailment, high speed safety.

Abstract

because high speed derailments escape experimental and statistical fields. Therefore, how is it possible to study high speed safety criteria?

As a deterministic event occurring in limited space and time, a dynamical derailment scenario is an "on-off" problem outside statistical analysis. Its proper simulation cannot rely on average or filtered forces. Proper calculation of wheel/rail contact forces reveals itself as the main issue. It must be at least verified that, at all times, wheel/rail contacts are of elastic type (no discontinuity) and that there are no interpenetration of profiles without associated forces, including conformal situations. This is verified using a precise graphical representation of un-deformed profile interpenetrations. The drawing software inputs are the coordinates (6 DoF of the wheelset and of the rails in the global frame) issued from the dynamical code at short intervals (10kHz sampling).

The method is applied to the task of determining the type of track defect that can destabilize a high speed light coach up to a complete dynamical derailment (wheels falling down outside the track).

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to IJRT
purchase this issue (price £70 +P&P)

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	International Journal of Railway Technology ISSN 2049-5358 IJRT, Volume 3, Issue 3, 2014 Reliability of High Speed Dynamical Derailment Simulations J.P. Pascal Montpellier University, Pléneuf-Val-André, France doi:10.4203/ijrt.3.3.3 purchase the full-text of this paper Full Bibliographic Reference for this paper J.P. Pascal, "Reliability of High Speed Dynamical Derailment Simulations", International Journal of Railway Technology, 3(3), 41-54, 2014. doi:10.4203/ijrt.3.3.3 Keywords: conformal contact, elastic contact, contact algorithms failure, railway vehicles simulation, wheelset derailment, high speed safety. Abstract because high speed derailments escape experimental and statistical fields. Therefore, how is it possible to study high speed safety criteria? As a deterministic event occurring in limited space and time, a dynamical derailment scenario is an "on-off" problem outside statistical analysis. Its proper simulation cannot rely on average or filtered forces. Proper calculation of wheel/rail contact forces reveals itself as the main issue. It must be at least verified that, at all times, wheel/rail contacts are of elastic type (no discontinuity) and that there are no interpenetration of profiles without associated forces, including conformal situations. This is verified using a precise graphical representation of un-deformed profile interpenetrations. The drawing software inputs are the coordinates (6 DoF of the wheelset and of the rails in the global frame) issued from the dynamical code at short intervals (10kHz sampling). The method is applied to the task of determining the type of track defect that can destabilize a high speed light coach up to a complete dynamical derailment (wheels falling down outside the track). purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to IJRT purchase this issue (price £70 +P&P)
Back to top	©Civil-Comp Limited 2023 - terms & conditions