Robust optimisation of railway crossing geometry

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Abstract

This paper presents a methodology for improving the crossing (frog) geometry through the robust optimisation approach, wherein the variability of the design parameters within a prescribed tolerance is included in the optimisation problem. Here, the crossing geometry is defined by parameterising the B-spline represented cross-sectional shape and the longitudinal height profile of the nose rail. The dynamic performance of the crossing is evaluated considering the variation of wheel profiles and track alignment. A multipoint approximation method (MAM) is applied in solving the optimisation problem of minimising the contact pressure during the wheel–rail contact and constraining the location of wheel transition at the crossing. To clarify the difference between the robust optimisation and the normal deterministic optimisation approaches, the optimisation problems are solved in both approaches. The results show that the deterministic optimum fails under slight change of the design variables; the robust optimum, however, has improved and robust performance. © 2016 Taylor & Francis
Original languageEnglish
Pages (from-to)617 - 637
Number of pages21
JournalVehicle System Dynamics: international journal of vehicle mechanics and mobility
Volume54
Issue number5
DOIs
Publication statusPublished - 2016

Keywords

  • rail geometry
  • Robust optimisation
  • track design
  • turnout crossings
  • vehicle–track interaction

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