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Implementation of Timoshenko element local deflection for vertical track modelling
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
CAF I D, Beasain, Guipuzcoa, Spain..
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-5760-3919
Ceit, San Sebastian, Guipuzcoa, Spain.;Univ Navarra, Dept Mech Engn & Mat, Tecnun, San Sebastian, Guipuzcoa, Spain..
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2019 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 57, no 10, p. 1421-1444Article in journal (Refereed) Published
Abstract [en]

A vertical track model suitable for the study of the dynamic response and the interaction between wheel and rail in the time domain is developed by using Timoshenko beam elements, and its performance is optimised by accounting for the local deflection of these type of elements. Implementation of the local system enables one to obtain an accurate description of the contact force in a more computationally efficient way than other numerical methods, and it leads to an almost total elimination of the discontinuities caused by the local displacement underestimation and the shear incompatibilities introduced by the conventional formulation with Timoshenko beam elements. The work presented here describes both static and dynamic approaches of the local system directly obtained through the resolution of the beam governing equations. The dynamic approach guarantees the shear rotation continuity and describes accurately the track frequency content. The method is tested for parametric excitation, in which it ensures the smoothness of the response. Secondly, it is tested for short-pitch corrugated rails, where overestimation of the contact force is avoided with a reduced model size when compared with conventional Timoshenko element formulation. The results are validated by comparison with those from previous studies.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2019. Vol. 57, no 10, p. 1421-1444
Keywords [en]
Timoshenko element, rail modelling, local deformation, dynamic local system, discontinuity in slope deflection, corrugation
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-256233DOI: 10.1080/00423114.2018.1513538ISI: 000478606800002Scopus ID: 2-s2.0-85053032740OAI: oai:DiVA.org:kth-256233DiVA, id: diva2:1363057
Note

QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-10-22Bibliographically approved

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Blanco, BlasKari, Leif

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