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Multi-Objective Optimization of Rail Pre-Grinding Profile in Straight Line for High Speed Railway

  • Wei Zeng (曾威)
  • Wensheng Qiu (丘文生)
  • Tao Ren (任涛)
  • Wen Sun (孙文)
  • Yue Yang (杨岳)
Article
  • 21 Downloads

Abstract

In order to modify the rail pre-grinding profile smoothly, non-uniform rational B-spline (NURBS) curve with weight factors is used to establish a parameterized model of the profile. A wheel-rail contact stochastic finite element model (FEM) is constructed by the Latin hypercube sampling method and 3D elasto-plastic FEM, in which the wheelset’s lateral displacement quantity is regarded as a random variable. The maximum values of nodal accumulated contact stress (NACS) and nodal mean contact stress (NMCS) in different pre-grinding profiles with differential weight factors are calculated and taken as the training samples to establish two Kriging models. A multi-objective optimization model of pre-grinding profile is established, in which the objective functions are the NACS and NMCS Kriging models. The optimum weight factors are sought using a non-dominated sorting genetic algorithm II (NSGA-II), and the corresponding optimum pre-grinding profile is obtained. The contact stress calculation before and after optimization indicates that the maximum values of NACS and NMCS decline significantly.

Key words

rail grinding profile optimization Kriging model lateral displacement quantity non-dominated sorting genetic algorithm II (NSGA-II) 

CLC number

U 213.2 

Document code

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Copyright information

© Shanghai Jiaotong University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Wei Zeng (曾威)
    • 1
    • 2
  • Wensheng Qiu (丘文生)
    • 2
    • 3
  • Tao Ren (任涛)
    • 1
  • Wen Sun (孙文)
    • 1
  • Yue Yang (杨岳)
    • 2
  1. 1.College of Mechanical EngineeringXi’an Shiyou UniversityXi’anChina
  2. 2.School of Traffic and Transportation EngineeringCentral South UniversityChangshaChina
  3. 3.Guangzhou Large Scale Track Maintenance Machine Running and Maintenance DivisionChina Railway Guangzhou Group Co., Ltd.GuangzhouChina

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