嵌入式轨道三维滚动接触模型冲击特性研究
Research on Impact Characteristics of Embedded Track Based on a Three-dimensional Rolling Contact Model
时潇迪 1李松 2韩健 3何远鹏 1肖新标 1梁树林1
作者信息
- 1. 西南交通大学 牵引动力国家重点实验室,成都 610031
- 2. 合肥市轨道交通集团有限公司,合肥 230000
- 3. 西南交通大学 机械工程学院,成都 610031
- 折叠
摘要
嵌入式轨道在城市轨道交通领域得到广泛运用,在高速铁路方面,国内外也有少量的相关报道和理论研究.嵌入式轨道对减缓轮轨冲击有显著效果,其中焊接接头是引起轮轨冲击的重要原因之一,对于时速400公里以及更高运行速度的列车,焊接接头冲击激励引起的轮轨力变化十分显著,目前对于高速工况下嵌入式轨道的研究尚不充分.基于显式动力学有限元方法,采用三维高速轮轨瞬态滚动接触模型对轮轨冲击过程进行数值模拟,并探究时速400公里速度下的嵌入式轨道的冲击特性.得出以下结论:嵌入式轨道与扣件式轨道在受到不同波长冲击时均能够减小垂向轮轨力变化幅值,焊接接头波长越长,垂向轮轨冲击力越能快速趋于平缓;车轮在受到焊接接头长波冲击时,嵌入式轨道能明显降低纵向轮轨力.研究结果可为嵌入式轨道在高速铁路的运用提供参考.
Abstract
Embedded rail has been widely used in the field of urban rail transit,and there are also a few relevant reports and theoretical studies on high-speed railway at home and abroad.Embedded track has a significant effect on mitigating wheel/rail impact,among which welded joints are one of the important factors for wheel/rail impact.When the train running at speed of 400 km/h and even higher,the change of wheel/rail force caused by impact excitation of welded joints is very significant.At present,the research of using embedded rail to high speed track is still insufficient.Based on the explicit dynamic finite element method,this paper uses a three-dimensional high-speed wheel-rail transient rolling contact model to numerically simulate the wheel rail impact process,and explores the impact characteristics of the embedded track at a speed of 400 km/h.It is concluded that both the embedded track and fastener track can reduce the magnitude of vertical wheel/rail force when impacted by different wavelengths.The longer the wavelength of welded joint is,the vertical wheel/rail impact force can approach gentle more quickly.When the wheel is impacted by the long wave of the welded joint,the embedded track can significantly reduce the longitudinal wheel/rail force.The research results provide a reference for the application of embedded track in high-speed railways.
关键词
振动与波/三维滚动接触模型/轮轨冲击/嵌入式轨道/高速铁路/隐式-显式有限元法Key words
vibration and wave/three-dimensional rolling contact model/wheel-rail impact/embedded track/high-speed track/implicit-explicit finite element method引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据