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1、CALCULATIONOFTHETAIL-PIPENOISEOFEXHAUSTSYSTEMSWITHWAVERolfJebasinskiJ.Ebersp?cher73730EsslingenGermanyABSTRACTsonthesuppliershavetodeveloptheirproductsinInthepastthecalculationofexhaustsystemstail-shortertimetoo.Onepossibilitytoapproachthisgoalpipenoisewasap
2、roblemwhichwasonlyareincreasedsimulationsofthespecificcharacter-unsatisfactorilysolved.Thefollowingpapershowstheisticsoftheproducttoreducecost-intensiveproto-possibilitiesofenginesimulationprogramsbasedontypingandtests.one-dimensionalComputationalFluidDynami
3、csBesidesemissioncontrolsthenoiseattenuationisthecodes,suchasWAVE,tocalculatethetail-pipenoisemostimportantfunctionofengineexhaustsystems.ofexhaustsystems.ComparisonofsimulationandWithincreasinglystringentlegislationandregulationsmeasurementshowthatitispossi
4、bletoaccuratelythedemandsmadeonexhaustsystemsincreasepredicttail-pipenoiseifthemuffler,withallinteriorconstantly.pipingsystems,iscorrectlymodeled.Even3-Theperformanceofanexhaustsystemismeasuredindimensionaleffectscanbesimulatedwithaspecialtermsoftail-pipenoi
5、se,whichisthesoundpressuremodelingapproach.Inadditionthebackpressurecanlevelinashortdistancetothetail-pipe.DifferentbecalculatedsothatthewholeexhaustsystemcanbeconceptshavebeentestedatEbersp?cherovertheoptimizedwithrespecttotail-pipenoiseandpast,whichpromise
6、dagoodpredictionofthetail-pipebackpressure.noise.WiththenewpreprocessorKADOSforWAVE,Eachdevelopmentprocessiscomplicatedbyconflict-whichsignificantlyreducesthetimeformodelingingtargets.InthecaseofexhaustsystemstheseareexhaustsystemswithWAVE,newpotentialsarise
7、forthedemandsforoptimumnoisereductionwhilethedevelopmentandoptimizationofexhaustsystems.keepingbackpressureataminimum.Inadditioncertainpackageconstraintexists,i.e.thepositionandINTRODUCTIONsizeofthemufflersaremostlyfixed.TheacousticThetime-to-markettimeforne
8、wautomobileshasoptimizationcanthereforeonlybemadewithdecreasedinthelastyearsconsiderably.Forthisrea-variationoftheductdiameterandtheinteriorpipingsystemofthemufflers.Calculationmethodsshouldafte
