Study on Elastic Wave Propagation Properties of Ballast Track Structure

被引：0
|
作者：
Yi Q. [1 ,2 ]
Wang P. [1 ,2 ]
Zhao C. [1 ,2 ]
Sheng X. [1 ,2 ]
Lu J. [1 ,2 ]
机构：
[1] Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu
[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2019年 / 41卷 / 06期
关键词：
Ballast track structure; Band gap; Elastic wave; Periodic structure; Power flow;
D O I：
10.3969/j.issn.1001-8360.2019.06.019
中图分类号：
学科分类号：
摘要：
Railway track structure has obvious periodic characteristics along the longitudinal direction of the track. The study of solid state physics shows that the propagation of elastic wave in periodic structures has significant band gap properties. Based on the analysis of ballasted track structure and the periodic characteristics of the track structure, the elastic wave propagation properties in the track structure were studied. Firstly, the dynamic model for the periodic track structure was established with the rail being considered as a Timoshenko beam, while the Bloch theorem and the transfer matrix method were applied to solve the dispersion curves of elastic wave in periodic track structure in order to obtain the band gaps. Secondly, based on the principle of superposition, the dynamic response of infinite track structure under harmonic loads was solved. Finally, the power flow method was used to analyse the propagation characteristics of the bending wave energy. The results show that the periodic track structure possesses the band gap properties. The elastic wave propagation in the band gaps is suppressed. No energy can be input into the system by external excitation while the input and propagation of the energy are allowed in the pass band. © 2019, Department of Journal of the China Railway Society. All right reserved.
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页码：137 / 145
页数：8
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