Influence of Bearing Flexibility in Rail Vehicle Dynamics
2015 (English)In: The international Journal of railway technology, ISSN 2049-5358, Vol. 4, no 1, 47-67 p.Article in journal (Refereed) Published
Dynamic multibody models for railway vehicles usually assume that the stiffness of the bearings is much higher than that of the primary suspension, neglecting their effect whatsoever. This assumption might not be entirely valid for high speed vehicles, where the primary suspension is stiffer than other rail vehicles; or for more complex systems such as variable gauge wheelsets, where the whole mechanic system might have a higher than expected flexibility. In this paper, a model to obtain the stiffness of a typical configuration of railway bearings is developed and applied to both a high speed vehicle bearing set and a variable gauge wheelset bearing set. The results show that the reduction of lateral stiffness as a result of bearing flexibility can reach up to 35% of its theoretical value. This massive reduction has a major influence on the prediction of the dynamic behaviour of these vehicles, e.g. critical speed or curving performance.
Place, publisher, year, edition, pages
Edinburgh: Civil-Comp Press , 2015. Vol. 4, no 1, 47-67 p.
roller bearing, bearing flexibility, railway dynamics, critical speed, variable gauge
Research subject Järnvägsgruppen - Fordonsteknik
IdentifiersURN: urn:nbn:se:kth:diva-174107DOI: 10.4203/ijrt.4.1.3OAI: oai:DiVA.org:kth-174107DiVA: diva2:857933
QC 201510012015-09-302015-09-302015-10-01Bibliographically approved