Dispersion analysis in ballasted railway tracks and Anderson localization in granular media

被引：3

作者：

Correa, L. de Abreu ^{[1
]}

Cottereau, R. ^{[1
,2
]}

Faure, B. ^{[3
]}

机构：

[1] Univ Paris Saclay, Cent Supelec, CNRS, MSSMat, St Aubin, France

[2] Aix Marseille Univ, LMA UMR7031, Cent Marseille, CNRS, Marseille, France

[3] SNCF, Innovat & Res Dept, St Denis, Reunion, France

来源：

JOURNAL OF SOUND AND VIBRATION | 2020年 / 465卷

关键词：

Ballasted railway tracks; Granular media; Heterogeneous media; Random media; Anderson localization; SOUND; PROPAGATION; MICROSTRUCTURE; VIBRATIONS; ULTRASOUND; STABILITY; WINDOWS; SCHEME; WAVES;

D O I：

10.1016/j.jsv.2019.115010

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

This paper analyzes the dynamic behavior of a randomly-heterogeneous continuum model of a ballasted railway track through the numerical construction of dispersion curves along the axis of the track. At intermediate frequencies (50-100 Hz), the dispersion curves display a strong decrease of the group velocity. At higher frequencies (above 100 Hz), the wave are strongly localized and cannot propagate along the track. This behavior is coherent with experimental observations reported in the literature on ballasted railway tracks and other granular media. Additional simulations are performed to prove that the localization is not a consequence of the geometry of the track or the impedance mismatch between the ballast and the underlying soil, but is indeed Anderson localization due to the heterogeneity of the ballast. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：13

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