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外文翻译--对不同的通风热结构行为在制动盘上的应用的研究 英文版【优秀】.pdf

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外文翻译--对不同的通风热结构行为在制动盘上的应用的研究 英文版【优秀】.pdf

JOURNALOFMECHANICALSCIENCEANDTECHNOLOGY2612012235240WWWSPRINGERLINKCOM/CONTENT/1738494XDOI101007/S122060110921YINVESTIGATIONOFTHERMOSTRUCTURALBEHAVIORSOFDIFFERENTVENTILATIONAPPLICATIONSONBRAKEDISCS†MESUTDUZGUNAUTOMOTIVEENGINEERINGDEPARTMENT,FACULTYOFTECHNOLOGY,GAZIUNIVERSITY,06500,ANKARA,TURKEYMANUSCRIPTRECEIVEDNOVEMBER12,2010;REVISEDJULY20,2011;ACCEPTEDSEPTEMBER18,2011ABSTRACTONEOFTHEMOSTCOMMONPROBLEMSRELATEDTOBRAKEDISCSISOVERHEATING,WHICHNEGATIVELYAFFECTSBRAKINGPERFORMANCEESPECIALLYUNDERTHECONTINUOUSBRAKINGCONDITIONSOFVEHICLESVENTILATIONAPPLICATIONSONBRAKEDISCSCANSIGNIFICANTLYIMPROVETHEBRAKESYSTEMPERFORMANCEBYREDUCINGTHEHEATINGOFTHEDISCSINTHISSTUDY,THETHERMALBEHAVIORSOFVENTILATEDBRAKEDISCSUSINGTHREEDIFFERENTCONFIGURATIONSWEREINVESTIGATEDATCONTINUOUSBRAKECONDITIONSINTERMSOFHEATGENERATIONANDTHERMALSTRESSESWITHFINITEELEMENTANALYSISTHERESULTSWERECOMPAREDWITHASOLIDDISCHEATGENERATIONONSOLIDBRAKEDISCSREDUCEDTOAMAXIMUMOF24WITHVENTILATIONAPPLICATIONSTHEEXPERIMENTALSTUDYINDICATEDFINITEELEMENTTEMPERATUREANALYSISRESULTSINTHERANGEBETWEEN113AND1087HOWEVER,THERMALSTRESSFORMATIONSWEREHIGHERWITHVENTILATEDBRAKEDISCSINCOMPARISONTOTHOSEWITHSOLIDDISCSKEYWORDSBRAKEDISCS;HEATGENERATION;THERMOSTRUCTURALBEHAVIORS;VENTILATIONAPPLICATIONS1INTRODUCTIONVENTILATEDBRAKEDISCSORROTORSAREKNOWNASHIGHPERFORMANCEBRAKES,ANDAREPRODUCEDBYMAKINGHOLLOWSORSLOTSORBOTHOFDIFFERENTSHAPESONDISCSURFACESANDSIDEEDGESVENTILATEDBRAKEDISCSWEREORIGINALLYTESTEDONRACINGCARSINTHE1960S,ANDTHEYHAVEBEENEMPLOYEDWIDELYINTHEAUTOMOTIVEANDRAILWAYINDUSTRYUSINGDIFFERENTDESIGNS1,2DURINGBRAKING,KINETICENERGYISCONVERTEDTOHEATAROUND90OFTHISENERGYISABSORBEDBYTHEBRAKEDISCANDTHENTRANSFERREDTOAMBIENTAIRSOLIDBRAKEDISCSDISSIPATEHEATSLOWLYTHEREFORE,VENTILATEDBRAKEDISCSAREUSEDTOIMPROVECOOLINGBYFACILITATINGAIRCIRCULATION3,4THEYGENERALLYEXHIBITCONVECTIVEHEATTRANSFERCOEFFICIENTSAPPROXIMATELYTWICEASLARGEASTHOSEASSOCIATEDWITHSOLIDDISCS5THEREARENUMEROUSSTUDIESRELATEDTOVENTILATIONAPPLICATIONSONBRAKEDISCSZUBERANDHEIDENREICH6MANUFACTUREDTHREEDIFFERENTVENTILATEDBRAKEDISCCONSTRUCTIONSFROMCARBONFIBERREINFORCEDCERAMICMATRIXCOMPOSITESCMCANDCOMPAREDTHEIRSTRENGTHSANTANAITISANDRIFICI7PROVEDTHATTHE90HOLECROSSDRILLEDPATTERNIMPROVEDHEATREJECTIONCAPABILITYOFTHEDISCBETWEEN88AND201DEPENDINGONTHEVEHICLESPEEDALEKSENDRICETAL8SHOWEDTHEABILITYOFAVENTILATEDBRAKEDISCROTORINDISSIPATINGTHERMALFLOWBYFINITEELEMENTANALYSISFEAVENKITACHALAMANDMAHARUDRAPPA9CONDUCTEDFLOWANDHEATTRANSFERANALYSISOFSIXDIFFERENTTYPESOFDISCCONFIGURATIONSBYCOMPUTATIONALFLUIDDYNAMICSCFDANDRECOMMENDEDVENTILATEDBRAKEDISCSFORHIGHSPEEDVEHICLESPARKETAL10DESIGNEDAHELICALSURFACEINSIDEVANESFORAVENTILATEDBRAKEDISCTHEYOPTIMIZEDREYNOLDSRE,PRANDTLPR,ANDNUSSELTNUNUMBERSFORTHEIRDESIGNANDOBTAINEDIMPROVEMENTSTOAMAXIMUMOF44INHEATTRANSFERIMPROVEMENTINBRAKEFADERESISTANCEANDHIGHERBRAKINGPERFORMANCEINWETCONDITIONSARESOMEOTHERUSEFULASPECTSOFVENTILATEDBRAKEDISCSHOWEVER,THEYALSOHAVESOMEDISADVANTAGESCRACKING,ISONEOFTHEMANDTHISAPHENOMENONTHATHASBEENCORRELATEDTOSTRESSESDURINGBRAKING11KIMETAL12SHOWEDTHEMAXIMUMVONMISESSTRESSGENERATIONOFACTUALFATIGUECRACKSLOCATEDONVENTILATEDBRAKEDISCSOFRAILWAYVEHICLESBYTHERMALSTRESSANALYSISSIMILARLY,BAGNOLIETAL13PERFORMEDFEATODETERMINETHETEMPERATUREPROFILEANDTOESTIMATETHEVONMISESSTRESSDISTRIBUTIONTHATARISESDURINGBRAKINGFORFIREFIGHTINGVEHICLESHWANGANDWU14INVESTIGATEDTEMPERATUREANDTHERMALSTRESSINAVENTILATEDBRAKEDISCBASEDONATHERMOMECHANICALCOUPLINGMODELDECREASINGTHEBRAKETEMPERATURESAND/ORREDESIGNINGTHEHUBROTORUNITWERESOMECONSIDERABLECONCLUSIONSOFMACKINETAL15TOELIMINATECRACKINGINBRAKEROTORSHEATGENERATIONALSOAFFECTSTHERMOMECHANICALINSTABILITYOFBRAKEDISCS16PREVIOUSLITERATUREFOCUSEDONHEATANDSTRESSFORMATIONSONVENTILATEDDISCSINTHISSTUDY,FEAWASUSEDTOINVESTIGATETHE†THISPAPERWASRECOMMENDEDFORPUBLICATIONINREVISEDFORMBYASSOCIATEEDITORDAEHEELEECORRESPONDINGAUTHORTEL903122028650,FAX903122120059EMAILADDRESSMDUZGUNGAZIEDUTRKSMESPRINGER2012236MDUZGUN/JOURNALOFMECHANICALSCIENCEANDTECHNOLOGY2612012235240THERMALBEHAVIOROFTHREEDIFFERENTVENTILATEDBRAKEDESIGNSCROSSDRILLEDCD,CROSSSLOTTEDCS,ANDCROSSSLOTTEDWITHSIDEGROOVECSSGDISCSTHERESULTSWERETHENCOMPAREDTOASOLIDSLDISCANEXPERIMENTALSTUDYWASALSOPERFORMEDTOVERIFYTHEFEARESULTS2THERMOSTRUCTURALFEAFORFEA,THREEDIMENSIONAL3DCONSTRUCTIONSOFBRAKEDISCS,BRAKEPADS,ANDTHEIRASSEMBLYDESIGNSWEREMODELEDWITH1/1SCALEINASOFTWAREPROGRAM,ANDTHENIMPORTEDINTOANOTHERSOFTWAREPROGRAMFORTHEINTERACTIVETHERMOSTRUCTURALANALYSESBRAKEDISCSANDBRAKEPADSWEREMODELEDBYQUADRATICHEXAHEDRONMESHTYPESQUADRATICHEXAHEDRONMESHGENERATIONSAREKNOWNFORTHEIRACCURACYANDCOMPUTATIONALEFFICIENCY17AFRICTIONALCONTACTPAIRHAVINGTHEELEMENTTYPEOFQUADRATICQUADRILATERALCONTACTWASDEFINEDBETWEENDISCPADINTERFACESFIG1SHOWSTHEMESHMODELSOFTHEDISCPADSYSTEMSGREYCASTIRON,ACOMMONLYUSEDDISCMATERIAL,WASUSEDFORTHEBRAKEDISCSTHEMECHANICALANDTHERMALPROPERTIESOFTHEBRAKEDISCSANDPADSAREGIVENINTABLE1VENTILATEDBRAKEDISCSWEREDESIGNEDACCORDINGTOTHEPROPELLERSHAPEDMETHODOLOGYFORTHEHOLEANDSLOTLOCATIONSFORTHECDDISC,FIVEHOLESWITH52MMDIAMETERWEREARRANGEDATEQUALINTERVALSONANARCWITHALENGTHOF6054MMTHESEHOLESWERED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

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