Wheel-Sleeper Impact Model in Rail Vehicle Analysis
2007 (English)In: Journal of System Design and Dynamics, ISSN 1881-3046, Vol. 1, no 3, 468-480 p.Article in journal (Refereed) Published
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.
Rail Vehicles, Derailment, Sleeper, Impact, Finite Element, Multi-Body System
IdentifiersURN: urn:nbn:se:kth:diva-7693OAI: oai:DiVA.org:kth-7693DiVA: diva2:12795
QC 201007012007-11-222007-11-222010-07-01Bibliographically approved