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- Brabie, Dan, et al.
(författare)
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An overview of some high-speed train derailments : means of minimizing consequences based on empirical observations
- 2008
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Ingår i: Proceedings of the Institution of mechanical engineers. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. - 0954-4097. ; 222:4, s. 441-463
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Tidskriftsartikel (refereegranskat)abstract
- Studies published on rail vehicles' post-derailment behaviour as ameans of minimizing consequences are surprisingly scarce. This paper sets a first step to reduce this lack of knowledge by analysing a collection of incident/accident case studies, with the main focus on the course of events immediately after derailments. This is mainly with respect to whether the train stays upright and close to the track centre-line and is 'safe' or deviates laterally with a probable serious consequence. Accordingly, an empirical database is established containing as much relevant information as possible of past incidents and accidents occurring at speeds over 70 km/h due to mechanical failure close to the running gear/track interface, as well as other causes that ultimately brought the train into a derailed situation. Although two derailments are never the same, certain patterns appeared to emerge based on the descriptions available in each incident or accident report. Mechanical restrictions between axles and bogie frames appear to minimize the risk of derailments after an axle failure on the outside of the wheel. Once derailed, evidence suggests that certain low-reaching parts on the wheelset or the bogie frame may act as substitute guidance mechanisms, thereby minimizing large lateral train deviations. However, for a large number of events, the available information does not allow conclusions based on observations only. This paper is the first in a forthcoming series dealing with the possibilities of minimizing devastating consequences of high-speed derailments by appropriate measures and features in the train design including the running gear.
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| 2. |
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| 3. |
- Brabie, Dan, et al.
(författare)
-
High-Speed Train Derailments : Minimizing Consequences through Innovative Design
- 2008
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Ingår i: Proceedings of the World Congress of Railway Research (WCRR'08).
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Konferensbidrag (refereegranskat)abstract
- In the current paper, various possibilities of minimizing consequences of high-speed rail vehiclederailments have been studied through a combination of empirical observations and multi bodysystem (MBS) simulations. In order to assess the appropriate measures and features for an increasedderailment-worthy design, a comprehensive MBS model is developed to predict the pre and postderailmentvehicle behaviour. Preventing wheel flange climbing derailment after axle journal failureson curved track is accomplished by implementing mechanical restrictions in the bogie frame. Threealternative substitute guidance mechanisms are presented and a systematic feasibility analysis forone of them, a low-reaching axle journal box, is presented. Three conventionally coupled passengertrailing cars are investigated after derailments on tangent and curved track as a function of themaximum centre coupler yaw angle, carbody height of centre of gravity, coupler and bogie transversalbeam height. Furthermore, the articulated train concept is investigated as a function of different intercarbodydamper characteristics.
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| 4. |
- Brabie, Dan, et al.
(författare)
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Post-derailment dynamic simulation of rail vehicles : Methodology and applications
- 2008
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Ingår i: Vehicle System Dynamics. - : Informa UK Limited. - 0042-3114 .- 1744-5159. ; 46:Suppl. S, s. 289-300
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Tidskriftsartikel (refereegranskat)abstract
- An earlier developed multi-body system post-derailment module. that predicts the wheelsets' behaviour after impact with concrete sleepers, is upgraded to account for possible wheel-rail fastener impact after train derailments at high speed. The vertical stiffness describing the wheel-fastener impact behaviour is calibrated and validated based on two authentic derailment cases. Geometrical specifications that permit it brake disc and a bogie frame to act as substitute guidance mechanisms after Hart e climbing derailments on Curved track are presented for an X 2000 trailer car. Further, an introductory analysis on the post-derailment vehicle behaviour on tangent track after a 'flange on rail head' derailment condition is also presented its a function of bogie yaw resistance. The risk of carbody overturning after derailments on tangent track is assessed as a function of coupler height and carbody centre of gravity as well as bogie transversal beam position.
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