期刊
WEAR
卷 265, 期 9-10, 页码 1349-1355出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2008.02.037
关键词
squat; rolling contact fatigue; finite element analysis; vehicle-track interaction; impact; track irregularities
Nowadays squats are a severe rolling contact problem on some railways. The root causes of it are not yet clear. From railway operation and maintenance points of view, root causes have to be known so that effective maintenance policies and plans can be made based on measurements and prediction. In the present work first a correlation analysis is performed based on measured data and field observations, and then a relation between squat occurrence and some parameters of the vehicle-track system is identified. Subsequently a transient finite element model of vehicle-track interaction is built up to analyze the contact forces and the resulting stresses and strains. The numerical results show good correspondence with observed phenomena at squats, and suggest certain relation between squat development and some eigen frequencies of the coupled vehicle-track system. A squat growth process is accordingly postulated. (C) 2008 Zili Li. Published by Elsevier B.V. All rights reserved.
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