周期性有砟轨道结构垂向弯曲振动波复频散分析  

Complex Dispersion Analysis of Vertical Bending Vibration Wave of Periodic Ballasted Track Structure

作　　者：徐伟 Xu Wei(China Reilway 25th Bureau Group Co.,Ltd.,Guangzhou 510600,China)

机构地区：[1]中铁二十五局集团有限公司,广东广州510600

出　　处：《华东交通大学学报》2023年第4期40-47,共8页Journal of East China Jiaotong University

基　　金：江西省防灾减灾及应急管理重点实验室项目(20212BCD42011)。

摘　　要：轨道结构的周期性特征对于其内振动波的传播具有滤波特性,开展频散分析对于了解轨道结构的振动传递特性具有重要意义。鉴于此,以有砟轨道结构为研究对象,基于虚拟弹簧模型和能量泛函变分原理提出了能够考虑阻尼因素与材料频变效应的轨道周期结构复频散计算新方法。通过与既有文献结果对比验证了文章方法的准确性,并利用该方法分析了扣件刚度频变效应、扣件阻尼和道砟阻尼对轨道结构振动波复频散特性的影响规律。研究结果表明,刚度频变效应及扣件、道砟阻尼对于振动的衰减域及衰减速率有着较大的影响,轨道结构振动传递分析中必须予以考虑。The periodic characteristics of the track structure have filtering characteristics for the propagation of vibration waves within the structure,and dispersion analysis is important for understanding the vibration transmission characteristics of the track structure.Based on the virtual spring model and the energy functional variation principle,we propose a new method to calculate the complex dispersion of the periodic structure of the rail based on the virtual spring model and the energy functional variation principle,which can consider the damping factor and the material frequency variation effect.The accuracy of the method is verified by comparing with the existing literature,and the method is used to analyze the influence law of fastener stiffness frequency variation effect,fastener damping and ballast damping on the vibration wave complex dispersion characteristics of track structure.The results show that the stiffness frequency variation effect and the fastener and ballast damping have a large influence on the attenuation domain and the attenuation speed of the vibration,which must be considered in the vibration transmission analysis of the track structure.

关 键 词：有砟轨道结构 复频散 带隙特性 阻尼 材料频变效应 

分 类 号：U213[交通运输工程—道路与铁道工程]