engine noise radiation.pdf

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1、EngineNoiseRadiationDr.KoenDeLangheIndia-December2006IndustryChallengesFastAccurateBetterRefinement“AcousticEngineerreceivesMakesureallphenomenaareInsteadof:projectforpredictingTotaltakenintoaccountthatare“predictingtheSoundPower”Radiatednoisefromvariantofcritic

2、alforthenoise:existingengineforfullengineGofor:run-up”e.g.fullscatteringanddiffraction,“Providingacost-effectivefullcoupling(ifneeded),acousticsolutionforSoundPowerTarget:resultswithin1/2daypumpingeffects,localstructuralproblems”damping,..2copyrightLMSInternatio

3、nal-2006LMSVirtual.LabAcousticsValueProposition1Preparation2Solution3Analysis4Refinement3copyrightLMSInternational-2006AcousticSolutionsLMSVirtual.LabEngineAcousticsEnd-to-endprocesssolution:in1day4copyrightLMSInternational-2006Vibro-acousticModelingandRefinemen

4、tProcessContributionAnalysisAcousticMeshingStructuralAcousticEngineFESolverNoiseResponseResponseMeshDrivingLevelsAnalysisEvaluationLoadLoadIdentificationDataRefinement5copyrightLMSInternational-2006MeshPre-processingandFESolverdriving°Mesh-basedDesign:°Elements/

5、Nodes°Materials°PropertiesandMasses°Axissystems°Spiders°DriveNASTRAN:°#solutions,includingSOL103,Set-upStaticCompensation,SPCs,DefinitionofOutputPoints°PARAMs,Backgroundorforeground°SimilarforANSYS,CATIACAE6copyrightLMSInternational-2006LoadIdentification°Variet

6、yofsources:°Combustionforces°Crankbearingforces°Valvetrain°Gearwhineandrattle°AccurateSourcemodelneededforaccuratenoisepredictions°LMSSolutionOptions:°Linkinfromexternalsoftware(e.g.Excite)°IdentifythroughMeasurements°EvaluatethroughMulti-bodysimulations7copyrig

7、htLMSInternational-2006ForcedResponseAnalysis°Onassembly&subsystemlevel.°LoadDatafrom:°Test,Multibody,User-defined°Launchmostappropriatesolver°Embedded:ModalandFRF-based°External:NASTRAN,…°Post-processing:°Widevarietyoffunctionaldisplays°DedicatedN&Vpost-process

8、ing°Easycomparisontotargets°Multi-rpmandorders8copyrightLMSInternational-2006LMSVirtual.LabEngineAcousticsAdvancedVibrationDataProcessing°Fromfastassessmentofacoustic