Metamaterials: towards railway applications

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Abstract

A railway network spans acrosslong distance and has been built to accommodate various and complex structuraltrack systems such as ballasted track, ballastless tracks, tunnel, viaduct,bridge, turnouts (switches and crossings), level crossings, and so on[1-4].  Thetrain wheels travel and interact with rails, inducing dynamic loadingconditions, which are the moving source of noise and vibration radiation. The wheel/rail interaction with any imperfection willcause detrimental impact loads on the railway track and its components. Theimpact emits disturbing noises (either impact or ground-borne noises) torailway neighbors. The impact and ground-borne noises are additional to the usualrolling noise[5-8]. A gap of knowledge inrailway noise and vibration mitigation is very significant, especially in thelight of research translation into industry applications. This is due to thelack of practical and systems-thinking expertise of researchers; and the lackof concerns and technical flexibility of rail industry practitioners[9-11].

Automobiles are responsible for20% of greenhouse gas emissions, whereas railways are only responsible for lessthan 0.6% but carry 11% of goods among European countries[12-14]. Also,train materials can be recycled for > 90%. Designing lowinterior noise within train carriages has created a big opportunity formetamaterial applications e.g. acoustic metamaterials for wall and carpet[15,16]. Life cycle andsustainability assessments have revealed appropriate technologies that aresuitable for railway applications, considering extreme climate resilience. Research shows thatmeta-inclusion and meta-ballast are considered to be low cost and low carbonsolutions suitable for rail infrastructures.

Original languageEnglish
Publication statusPublished - 28 Feb 2019
EventDENORMS Workshop6: Industrial days on new acoustic treatments, acoustic metamaterials and sonic crystals: DENORMS - National Technical University of Athens, Athens, Greece
Duration: 28 Feb 20191 Mar 2019
https://denorms.eu/2019/01/08/workshop-6/

Conference

ConferenceDENORMS Workshop6: Industrial days on new acoustic treatments, acoustic metamaterials and sonic crystals
Abbreviated titleDENORMS
Country/TerritoryGreece
CityAthens
Period28/02/191/03/19
Internet address

Bibliographical note

Industrial days on new acoustic treatments, acoustic metamaterials and sonic crystals, https://denorms.eu/2019/01/08/workshop-6/

Keywords

  • metamaterial
  • acoustics
  • vibration
  • railway
  • applications

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