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C. Casanueva^1,2, A. Alonso^3,4 and J.G. Giménez⁴

¹Rail Vehicles Unit, KTH Royal Institute of Technology, Stockholm, Sweden
²Centre for ECO2 Vehicle Design, KTH Royal Institute of Technology, Stockholm, Sweden
³Department of Applied Mechanics, CEIT, Donostia-San Sebastián, Spain
⁴TECNUN, University of Navarra, Donostia-San Sebastián, Spain

Keywords: roller bearing, bearing flexibility, railway dynamics, critical speed, variable gauge.

Abstract

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.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	International Journal of Railway Technology ISSN 2049-5358 IJRT, Volume 4, Issue 1, 2015 Influence of Bearing Flexibility in Rail Vehicle Dynamics C. Casanueva^1,2, A. Alonso^3,4 and J.G. Giménez⁴ ¹Rail Vehicles Unit, KTH Royal Institute of Technology, Stockholm, Sweden ²Centre for ECO2 Vehicle Design, KTH Royal Institute of Technology, Stockholm, Sweden ³Department of Applied Mechanics, CEIT, Donostia-San Sebastián, Spain ⁴TECNUN, University of Navarra, Donostia-San Sebastián, Spain doi:10.4203/ijrt.4.1.3 purchase the full-text of this paper Full Bibliographic Reference for this paper C. Casanueva, A. Alonso, J.G. Giménez, "Influence of Bearing Flexibility in Rail Vehicle Dynamics", International Journal of Railway Technology, 4(1), 47-67, 2015. doi:10.4203/ijrt.4.1.3 Keywords: roller bearing, bearing flexibility, railway dynamics, critical speed, variable gauge. Abstract 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. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to IJRT purchase this issue (price £70 +P&P)
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