摘要
基于车辆-轨道耦合动力学理论,分析了曲线段两种典型钢轨焊接接头不平顺模型激扰下不平顺参数对轮轨系统动力响应及车辆稳定性的影响,并对现有《地铁设计规范》规定的钢轨焊接接头不平顺限值进行了验证评价。研究结果表明:余弦型焊接接头不平顺会引起较明显的轮轨冲击,轮轨系统动力响应随不平顺波长的增大而减小,随行驶速度的提高和波深的增大而增大;叠加型焊接接头不平顺对轮轨动力影响主要受短波成分波长和波深的影响,且对轮轨动力影响要明显大于余弦型焊接接头不平顺。验证评价结果表明,现有《地铁设计规范》规定的钢轨焊接接头不平顺0.5 mm安全限值对于城市轨道交通线路来说是要求较高的。
Based on the vehicle/rail coupling dynamics theory,the influence of irregularity parameters on the wheel/rail system dynamics response and the train stability are analyzed,which are obtained from the turbulence of two irregularity models of typical rail welding joints on the curve segment.Then,the limit value of rail welded joint irregularity stipulated in the“Code for Metro Design”is verified and evaluated.The results show that the irregularity of the cosine welded joint will cause obvious wheel/rail impact,the dynamic response of wheel/rail system decreases with the increase of irregularity wave length,and increases with the increase of the running speed and wave depth;the influence of the superimposed welded joint irregularity on the wheel/rail dynamic response is mainly affected by the wavelength and depth of the short-wave components,the influence of the wavelength and short-wave components is significantly greater than that of the cosine-type welded joint irregularity.The verification results show that the safety limit value of 0.5 mm for rail welded joint irregularity in the“Code for Metro Design”is rather strict for the existing railway lines.
作者
张克平
石广田
和振兴
张小安
包能能
石蕊
ZHANG Keping;SHI Guangtian;HE Zhenxing;ZHANG Xiao’an;BAO Nengneng;SHI Rui(School of Mechanical Engineering,Lanzhou Jiaotong University,730070,Lanzhou,China)
出处
《城市轨道交通研究》
北大核心
2019年第9期32-36,共5页
Urban Mass Transit
基金
国家自然科学基金项目(51868037)
甘肃省高等学校科技成果转化项目(2018D-09)
