Effect of viscoelastic-plastic dynamic properties of rail pads on curved rail dynamic characteristics based on the modified SEM–SM hybrid method
Effect of viscoelastic-plastic dynamic properties of rail pads on curved rail dynamic characteristics based on the modified SEM–SM hybrid method
复制标题
DOI：
10.1080/00423114.2022.2057864
复制
发表时间：
2022-04
影响因子：
3.6
通讯作者：
Yinling Dou;Ping Wang;Wenhao Ding;Shaohua Wang;Kai Wei
中科院分区：
文献类型：
--
作者：
Yinling Dou;Ping Wang;Wenhao Ding;Shaohua Wang;Kai Wei
为了准确、高效地研究钢轨垫板粘弹塑性动力特性对曲线钢轨振动特性的影响，将谱元法（SEM）和辛算法（SM）相结合，建立了无限曲线轨道的空间模型。具体而言，分数阶导数Zener模型结合贝格摩擦模型被用来描述钢轨垫的动态特性。随后，曲线轨道的流动性和衰减率（DR）进行了分析，占的频率，预载，和振幅的依赖性的轨道垫。总之，频率依赖性主要影响曲线钢轨的中低频振动，并使该范围内的振动向高频移动。对于不同自由度的曲线轨道DR，由于耦合作用，其波型在DR曲线的交叉频率处相互转换，扭转（轴向）波具有最大（最小）DR。预紧力的依赖性对曲线轨道的竖向振动和扭转振动有显著影响。随着预紧力的增加，第一垂直波和扭转波的截止频率增加，因此，曲线轨道振动更多地向下传递。
To accurately and efficiently investigate the influence of the viscoelastic-plastic dynamic properties of rail pads on curved rail vibration characteristics, a spatial model of an infinitely curved track was developed by combining the spectral element method (SEM) and symplectic method (SM). Specifically, a fractional derivative Zener model combined with a Berg friction model was used to describe the dynamic properties of the rail pad. Subsequently, the curved rail mobility and decay rate (DR) were analyzed by accounting for the frequency, preload, and amplitude dependence of the rail pad. In conclusion, the frequency dependence mainly influenced the low- and medium-frequency vibrations of the curved rail and made the vibration within this range to shift to higher frequencies. In terms of the curved rail DRs of different degrees of freedom, because of their coupling effects, the wave modes were converted mutually at the cross frequency of their DR curves, and the torsional (axial) wave had the maximum (minimum) DR. The preload dependence had a significant effect on the vertical and torsional vibrations of the curved rail. As the preload increased, the cut-on frequencies of the first vertical and torsional waves increased; consequently, the curved rail vibrations were transmitted more in the downward.