弹性垫层温频变特性对减振型CRTSⅢ板式无砟轨道振动响应影响研究  

Influence of temperature-and frequency-dependent properties of elastic layer on vibration response of vibration reducing CRTSⅢ slab ballastless track

作　　者：牛振宇 刘林芽[1] 秦佳良 左志远 NIU Zhenyu;LIU Linya;QIN Jialiang;ZUO Zhiyuan(Engineering Research Center of Railway Environment Vibration and Noise,Ministry of Education,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013

出　　处：《中南大学学报（自然科学版）》2021年第10期3771-3782,共12页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51578238,51968025);江西省自然科学基金资助项目(20192ACBL20009,20202BAB204027);江西省青年科学基金资助项目(20202BABL214048)。

摘　　要：针对弹性垫层,首先通过其动态力学性能试验,基于高阶分数阶导数FVMP(fraction Voigt and Maxwell model in parallel)模型并结合温频等效原理,表征弹性垫层的温频变特性,然后将该模型应用于车辆-轨道垂向耦合系统中,最后分析弹性垫层温频变特性对轨道结构振动响应的影响。研究结果表明:温度和加载频率对弹性垫层的动态力学性能有显著影响,而高阶分数阶导数FVMP模型能准确表征这种力学行为;在时域响应中,垂向轮轨力、钢轨垂向位移、钢轨垂向振动加速度和轨道板垂向振动加速度在FVMP模型下计算的峰值明显比K-V(Kelvin-Voigt)模型下的峰值大;在中高频段内,轨道结构各部分的响应都表现为FVMP模型下的响应比K-V模型下的响应大,而且轨道结构各部分的响应呈现出随温度降低而减小的趋势。在进行仿真分析时,为提高对轨道结构预测的准确性,有必要考虑弹性垫层的温频变特性。The elastic layer was taken as the research object. Firstly, through its dynamic mechanical test and based on the high-order fractional derivative FVMP model combined with the temperature-frequency equivalent principle, the temperature-and frequency-dependent properties of elastic layer were characterized. Then the model was applied in the vertical vehicle-track coupled system. Finally, the effect of temperature-and frequencydependent properties of the elastic layer on track structure vibration response was analyzed. The results show that temperature and loading frequency have significant effects on the dynamic mechanical properties of elastic layer.The high-order fractional derivative FVMP model can accurately characterize this property. In the time domain response, the peak values of vertical wheel-rail force, rail vertical displacement, rail vertical vibration acceleration and slab track vertical vibration acceleration of FVMP model are significantly greater than those of K-V model. In the middle and high frequency band, the response of each part of the track structure shows that the response of FVMP model are greater than that of K-V model, and the response of each part of track structure decreases with the decrease of temperature. Therefore, in order to improve the accuracy of track structure prediction, it is necessary to consider the temperature-and frequency-dependent properties of elastic layer.

关 键 词：弹性垫层 FVMP模型 温频等效原理 温频变特性 车-轨耦合 

分 类 号：U238[交通运输工程—道路与铁道工程]