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铁路客运专线吸声式声屏障降噪研究.docx

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铁路客运专线吸声式声屏障降噪研究 Abstract NoisepollutionhasalwaysbeenacriticalissuethathindersthedevelopmentofrailwaysinChina.Theconstructionofhigh-speedraillinesandtheexpansionofpassengervolumeshaveresultedinincreasinglevelsofnoise.Soundbarriersareconsideredaneffectivemethodofreducingrailwaynoise,andtheabsorption-typesoundbarrierisawidelyusedtechnology.Thispaperaimstoexploretheeffectivenessofabsorption-typesoundbarriersonreducingrailwaynoiseinChina.ItexaminesthecurrentstatusofrailwaynoiseinChinaandintroducestheconceptofabsorption-typesoundbarriers.Thepaperthenanalyzesthedesignprocessandmaterialsselectionofabsorption-typesoundbarriers.Finally,thispapersummarizestheadvantagesanddisadvantagesofabsorption-typesoundbarriers,andprovidessuggestionsforfurtherresearch. Introduction RailtransportationisoneofthemajormodesoftransportationinChina.Withtherapiddevelopmentofthisindustryinrecentyears,thenoisepollutionissueassociatedwithrailtransportationhasbecomeapressingconcern.Thehighestlevelofnoisethatahumanbeingcantolerateis50dB,andanysoundabovethatlevelcancausedamagetothehearingsystem.Railwaynoisecanhaveasignificantimpactonthequalityoflifeofpeoplelivingneartherailwaylines,anditalsoadverselyaffectswildlifeinthearea. TheMinistryofEnvironmentalProtectionofChinahassetstringentnoisemonitoringstandardsforrailwaylines.Despitethegovernment’sefforttocontrolnoisepollution,theincreasingpassengervolumeandtheexpansionofhigh-speedraillinescausehigherlevelsofnoisepollution.Soundbarriersareconsideredaviablesolutiontoalleviaterailwaynoise. Absorption-typesoundbarriers Soundbarriersareastructurethatseparatesrailwaynoisefromitssurroundingsbyminimizingsoundwavesreflection.Therearevarioustypesofsoundbarriers,includingabsorption-typesoundbarriers,reflection-typesoundbarriers,anddiffusion-typesoundbarriers.Absorption-typesoundbarriersarethemostwidelyusedtechnologyforcontrollingrailwaynoise. Absorption-typesoundbarriersworkbyincreasingthesurfaceareaofthesoundbarrier,thusincreasingtheamountofsoundenergyabsorbed.Theab