排气系统尾管噪音计算.pdf

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1、CALCULATIONOFTHETAIL-PIPENOISEOFEXHAUSTSYSTEMSWITHWAVERolfJebasinskiJ.Eberspächer73730EsslingenGermanyABSTRACTsonthesuppliershavetodeveloptheirproductsinInthepastthecalculationofexhaustsystemstail-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.DifferentbecalculatedsothatthewholeexhaustsystemcanbeconceptshavebeentestedatEberspächerovertheoptimizedwithrespecttotail-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