双层非线性扣件系统频变特性对轮轨动力特性的影响  

Influence of frequency-dependent characteristics of double-layer nonlinear fastener system on wheel-rail dynamics characteristics

作　　者：李霞 唐伟[1] 戴佳宇 圣小珍 王安斌 LI Xia;TANG Wei;DAI Jia-yu;SHENG Xiao-zhen;WANG An-bin(School of Urban Railway Transportation,Shanghai University of Engineering Science,Shanghai 201620,China;State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620 [2]西南交通大学轨道交通运载系统全国重点实验室,四川成都610031

出　　处：《交通运输工程学报》2024年第6期159-171,共13页Journal of Traffic and Transportation Engineering

基　　金：国家自然科学基金项目(52202477);轨道交通运载系统全国重点实验室开放课题(RVL2402)。

摘　　要：为研究双层非线性扣件系统频变特性对轮轨动力特性的影响,基于锤击法测得了该扣件系统在100~1000 Hz内的动刚度;建立了轨道结构有限元模型和轮轨瞬态滚动接触有限元模型,在模型中考虑扣件系统的频变特性,基于轨道结构模型分析了扣件系统频变特性对钢轨振动特性的影响,利用轮轨瞬态滚动接触模型分析其对轮轨动力特性的影响。研究结果表明:扣件系统在垂向、横向和纵向的动刚度随频率增大,总体呈现出增大的趋势;扣件系统频变特性导致340 Hz以上钢轨振动更加显著,同时钢轨振动峰值所对应的频率向更高频段移动,340~700 Hz频段钢轨振动响应的变化是频变刚度和频变阻尼共同作用的结果,800~900 Hz频段的变化主要受扣件系统频变刚度的影响;钢轨振动响应的这种变化对小半径曲线段通过频率在340 Hz以上的短波长波磨有较大影响,因此,考虑扣件系统频变特性有益于提高该频段短波长波磨的预测精度;扣件系统频变刚度对轴箱振动加速度和轮轨力的影响较小,其最大值降低了约2%;扣件系统频变阻尼对这两者的影响较大,频变阻尼使轴箱振动加速度和轮轨力在100~470 Hz频段增大,在470~1000 Hz频段减小;扣件系统频变特性对最大轮轨接触应力影响较小,考虑频变刚度时对应的轮轨接触应力略大,考虑频变阻尼时对应的轮轨接触应力略小。To study the influence of frequency-dependent characteristics of double-layer nonlinear fastener system on wheel-rail dynamics characteristics,the dynamic stiffness of the fastener system within the frequency range of 100-1000 Hz was obtained by hammering method.The finite element models of track structure and wheel-rail transient rolling contact were established.The frequency-dependent characteristics of the fastener system were considered in the models.Based on the track structure model,the influence of the frequency-dependent characteristics of the fastener system on the rail vibration characteristics was analyzed.The influence of the fastener system on the wheel-rail dynamics characteristics was analyzed by using the transient rolling contact model.Research results show that the dynamic stiffnesses of the fastener system in the vertical,lateral,and longitudinal directions generally increase with frequency.The frequency-dependent characteristics of the fastener system lead to more significant rail vibration at the frequency of above 340 Hz,and the frequency range corresponding to the peak rail vibration shifts towards higher frequencies.The changes in rail vibration response within the frequency range of 340-700 Hz are caused by the combined effects of frequency-dependent stiffness and damping,while the changes within the frequency range of 800-900 Hz are primarily influenced by the frequency-dependent stiffness of the fastener system.These changes in rail vibration response have a significant impact on the passing frequency of short-wavelength rail corrugation at above 340 Hz in small-radius curve sections.Therefore,considering the frequency-dependent characteristics of the fastener system is beneficial for improving the prediction accuracy of short-wavelength rail corrugation in this frequency range.The frequency-dependent stiffness of the fastener system has a relatively small impact on axle box vibration acceleration and wheel-rail forces,and the maximum value reduces by about 2%.However,the frequency-depe

关 键 词：轨道交通 双层非线性扣件 频变特性 刚度 阻尼 瞬态滚动 

分 类 号：U211.5[交通运输工程—道路与铁道工程]