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Wheel-Sleeper Impact Model in Rail Vehicle Analysis
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2007 (English)In: Journal of System Design and Dynamics, ISSN 1881-3046, Vol. 1, no 3, 468-480 p.Article in journal (Refereed) Published
Abstract [en]

The current paper establishes the necessary prerequisites for studying post-derailment dynamic behavior of high-speed rail vehicles by means of multi-body system (MBS) software. A finite-element (FE) model of one rail vehicle wheel impacting a limited concrete sleeper volume is built in LS-DYNA. A novel simulation scheme is employed for obtaining the necessary wheel-sleeper impact data, transferred to the MBS code as pre-defined look-up tables of the wheel's impulse variation during impact. The FE model is tentatively validated successfully by comparing the indentation marks with one photograph from an authentic derailment for a continuous impact sequence over three subsequent sleepers. A post-derailment module is developed and implemented in the MBS simulation tool GENSYS, which detects the wheel contact with sleepers and applies valid longitudinal, lateral and vertical force resultants based on the existing impact conditions. The accuracy of the MBS code in terms of the wheels three-dimensional trajectory over 24 consecutive sleepers is successfully compared with its FE counterpart for an arbitrary impact scenario. An axle mounted brake disc is tested as an alternative substitute guidance mechanism after flange climbing derailments at 100 and 200 km/h on the Swedish high-speed tilting train X 2000. Certain combinations of brake disc geometrical parameters manage to stop the lateral deviation of the wheelsets in circular curve sections at high lateral track plane acceleration.

Place, publisher, year, edition, pages
2007. Vol. 1, no 3, 468-480 p.
Keyword [en]
Rail Vehicles, Derailment, Sleeper, Impact, Finite Element, Multi-Body System
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7693OAI: oai:DiVA.org:kth-7693DiVA: diva2:12795
Note
QC 20100701Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2010-07-01Bibliographically approved
In thesis
1. On Derailment-Worthiness in Rail Vehicle Design: Analysis of vehicle features influencing derailment processes and consequences
Open this publication in new window or tab >>On Derailment-Worthiness in Rail Vehicle Design: Analysis of vehicle features influencing derailment processes and consequences
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis aims at systematically studying the possibilities of minimizing devastating consequences of high-speed rail vehicle derailments by appropriate measures and features in the train design including the running gear.

Firstly, an empirical database is established containing as much relevant information as possible of past incidents and accidents that have occurred at substantial running speeds due to mechanical failure close to the interface between the running gear and the track. Other causes that ultimately brought the train in a derailed condition are also covered. Although various accidental circumstances make each derailment a unique event, certain patterns appear to emerge which lead to several critical vehicle parameters capable of influencing the outcome of a derailment or preventing a derailment to occur.

Secondly, the possibility of preventing wheel climbing derailments after an axle journal failure is studied by implementing mechanical restrictions between wheelsets and bogie frame. In this respect, a multi body system (MBS) computer model is developed to account for such an axle failure condition, which is successfully validated on the basis of two authentic passenger car events.

In order to study the overall post-derailment vehicle behaviour, in particular the wheelsets’ vertical motion and lateral deviation on sleepers, a comprehensive MBS post-derailment module is developed and implemented in the commercially available software GENSYS. The model detects wheel-sleeper impact conditions and applies valid force resultants calculated through linear interpolation based on a pre-defined look-up table. The table was constructed through exhaustive finite element (FE) wheel to concrete sleeper impact simulations utilising the commercially available software LS-DYNA. The MBS post-derailment module has been validated successfully in several stages, including a correct prediction of the derailing wheelset’s trajectory over ten consecutive sleepers in comparison with an authentic passenger vehicle derailment event.

An extensive simulation analysis on the feasibility of utilizing alternative substitute guidance mechanisms attached to the running gear on rail vehicles is presented, as means of minimizing the lateral deviation. Three low-reaching guidance mechanisms attached onto the running gear (bogie frame, brake disc and axle journal box) are analysed in terms of geometrical parameters for a successful engagement with the rail in order to prevent large lateral deviations after twelve different derailment scenarios.

Three conventional coupled passenger trailing cars are investigated in terms of lateral deviation and vehicle overturning tendency after derailments on tangent and curved track. This is performed as a function of various vehicle design features and parameters such as: maximum centre coupler yaw angle, carbody height of centre of gravity, coupler height and additional running gear features. In a similar manner, the articulated train concept is investigated in terms of the post-derailment vehicle behaviour as a function of different inter-carbody damper characteristics and running gear features.

Place, publisher, year, edition, pages
Stockholm: Farkost och flyg, 2007. xii, 50 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2007:78
Keyword
derailment, bogie design, wheel-sleeper impact, simulation, deviation, vehicle inter-connection, guidance mechanism, substitute guidance, articulated train, railway safety
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4548 (URN)978-91-7178-828-3 (ISBN)
Public defence
2007-12-18, F3, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100701Available from: 2007-11-22 Created: 2007-11-22 Last updated: 2010-07-01Bibliographically approved

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