Multi-Objective Optimization of Rail Pre-Grinding Profile in Straight Line for High Speed Railway
- 1 Downloads
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 wordsrail grinding profile optimization Kriging model lateral displacement quantity non-dominated sorting genetic algorithm II (NSGA-II)
CLC numberU 213.2
Unable to display preview. Download preview PDF.
- LIU Y M, LI J Y, CAI Y L, et al. Current state and development trend of rail grinding technology [J]. China Railway Science, 2014, 35(4): 29–37 (in Chinese).Google Scholar
- JIA J Z, SI D L. Target profile of rail grinding for small radius curve of Shuohuang railway [J]. China Railway Science, 2014, 35(4): 15–21 (in Chinese).Google Scholar
- ZHOU Q Y, ZHANG Y H, TIAN C H, et al. Profile design and test study of 60N rail [J]. China Railway Science, 2014, 35(2): 128–135 (in Chinese).Google Scholar
- SHEN G, ZHONG X B. Implementations of newly developed wheel and rail profile design methods [J]. Journal of Traffic and Transportation Engineering, 2014, 1(3): 221–227.Google Scholar
- XIAO J L, LIU X Y. Design method of rail asymmetric silhouette [J]. Journal of Southwest Jiaotong University, 2010, 45(3): 361–365 (in Chinese).Google Scholar
- CHEN S P. Interpolation and application for cubic NURBS curves [J]. Mechanical Science and Technology, 2001, 20(5): 692–693 (in Chinese).Google Scholar
- WANG K Y, ZHAI W M, CAI C B. The influence of wheel/rail profile and the system parameters on the wheel/rail contact geometry relationship [J]. Railway Vehicles, 2002, 40(2): 14–18 (in Chinese).Google Scholar
- HOU C L, ZHAI W M, DENG R. Finite element analysis of the elastic-plastic contact of the worn wheels and rails on curve [J]. China Railway Science, 2009, 30(5): 28–33 (in Chinese).Google Scholar
- XIE Y M, YU H P, CHEN J, et al. The reliability estimation based on Kriging model [J]. Journal of Shanghai Jiao Tong University, 2007, 41(2): 177–180 (in Chinese).Google Scholar
- ZHAO R G, LI J J. NSGA-II algorithm and its improvement [J]. Control Engineering of China, 2009, 16(supl): 61–63 (in Chinese).Google Scholar