LMS-Virtual.Lab-汽车NVH应用概述

1-LMSCompanyconfidential-2012LMSVirtual.LabIntegrated-UnifiedModelingSupportedbyTest2-LMSCompanyconfidential-2012AUTOVehicle-levelN&VSolutionsInteriorNoise:roadnoise,enginenoise,windnoise,soundsystemdesignExteriorNoise:pass-bynoise,panelloadingassessment,pedestriansafety3-LMSCompanyconfidential-2012ResponseEvaluationTargetResponseIdentificationofWeakPerformanceFrequencyAreasWeakSpotAnalysisCAEBasedCountermeasuresStrategyforimprovementInteriorAcousticsandNVHprocessoverviewSectionoffrontroofrailDevelopmentStageRefinementStageCAETESTCAECAETESTCAE4-LMSCompanyconfidential-2012WeakspotanalysisPowerfulNVHcontributionanalysis•Highinputforceorhighbodytransfer?•Mounttoostifforinputpointtooweak?•Dominantpaths•Physical•Radiatingpanel•Structuraltransferpath•Modal•Structuralmode•Acousticmode•OperatingdeflectionshapeanalysisPmobNTFfrontMicNTFrearMic3copyrightLMSInternational-2005ResponseEvaluationResponseEvaluationTargetResponseTargetResponseIdentificationofWeakIdentificationofWeakPerformancePerformanceFrequencyAreasFrequencyAreasCAEBasedWeakCAEBasedWeakSpotAnalysisSpotAnalysisCAEBasedCAEBasedTroubleshootingTroubleshootingStrategyforStrategyforimprovementimprovementEffectiveCAEanalysisofcountermeasuresGlobalOverviewSectionoffrontroofrailFSUB:0003:+X5-LMSCompanyconfidential-2012Weakspotanalysisexample2peaksofinterest:2700RPM(90Hz)–Enginecondition(run-up)–RearmicrophoneMainpaths:•TQRD:BOLT:+X•EMRI:PAS1:+Z6-LMSCompanyconfidential-2012WeakspotanalysisexamplesRearMicrophone90HZMiddleRoofRearRoofTailgateFloorElementContributionATVPanelContributionsandATV’s:3copyrightLMSInternational-2005ResponseEvaluationResponseEvaluationTargetResponseTargetResponseIdentificationofWeakIdentificationofWeakPerformancePerformanceFrequencyAreasFrequencyAreasCAEBasedWeakCAEBasedWeakSpotAnalysisSpotAnalysisCAEBasedCAEBasedTroubleshootingTroubleshootingStrategyforStrategyforimprovementimprovementEffectiveCAEanalysisofcountermeasuresGlobalOverviewSectionoffrontroofrailEnginenoise@90Hz-TQRD:BOLT:X7-LMSCompanyconfidential-2012WeakspotanalysisexampleBendingModeofthebeamwhichisresponsiblefortheroofcontributionRunningMode–90Hz:3copyrightLMSInternational-2005ResponseEvaluationResponseEvaluationTargetResponseTargetResponseIdentificationofWeakIdentificationofWeakPerformancePerformanceFrequencyAreasFrequencyAreasCAEBasedWeakCAEBasedWeakSpotAnalysisSpotAnalysisCAEBasedCAEBasedTroubleshootingTroubleshootingStrategyforStrategyforimprovementimprovementEffectiveCAEanalysisofcountermeasuresGlobalOverviewSectionoffrontroofrail8-LMSCompanyconfidential-2012TrimmedbodymodelNTFs9-LMSCompanyconfidential-2012LMSVirtual.LabNVHValuePropositionSystemLevelNVHResponseandContributionAnalysisNVHSensitivityandOptimizationBuildingtheNVHModelUnderstandingtheresponseImprovingtheresponseIntegratecomponentsintofullvehicleNVHassemblyComputefullvehiclemodesandFRFsPre-processandapplyloadsCarryoutresponseandcontributionanalysisonfullvehicleandsubsystemlevelInvestigateNVHresponsesensitivitytowardsdesignchangesOptimizeNVHperformance10-LMSCompanyconfidential-2012AssemblySetupSubsystemfilecanbeFEorTestmodelHYBRIDassemblyAssemblyoverviewinspecificationtreeorassembly2dviewerComponentfiles12311-LMSCompanyconfidential-2012Virtual.LabNVHAssemblyHybridFRFandModalSolutionsAssemblySolutionsinVirtual.LabNVHModalBasedSolution:ModalBasisforFEandTestComponentsVisu/expansiongroupsParticipationofuncoupledmodesinassemblymodesFRFBasedSolutionFRFSetinrelevantpoints(loadconnectionsresponsepoints)comingfrom:•Testdatabase•SynthesizedfromFEmodes(resvecs)•DirectFEcomputation(NASTRAN)MultipleSubsystemscanbedefinedformultilevelpathcontributionanalysisafterwardsExternalFESolverSetupanddriveNASTRANModalCase•UseofComponentRepresentationManager:writeoutpre-computedcomponentmodalbasisasMPCSetupanddriveNASTRANFRFCase12-LMSCompanyconfidential-2012Engine/AccessoriesExcitationEngineLoads:Onephenomenon,„singlereference‟OrdercutsandwaterfalloffrequencyspectradatatypesDatacanbeimportedfrom:•Testfile(LMSTest.Lab)•Excel,tabulatedtxt,UNV•Userdefined•FromMultiBodySimulationinLMSVirtual.LabMotionPre-ProcessingToolsavailabletoconvertdatatypes:•DSP:FromTime(multiRPM)Frequency(multiRPM)•Cutordersfromwaterfalloffrequencyspectratoretaininfoneededatorders13-LMSCompanyconfidential-2012RoadExcitationRoadLoads:Multiplepartiallycorrelatedphenomena,„multi-reference‟FrequencyspectraDatacanbeimportedfrom:•Testfile(LMSTest.Lab)/Excel/tabulatedtxt/Userdefined/LMSVirtual.LabMotionMBSPre-ProcessingToolsavailabletoconvertdatatypes:•DSP:FromTimeFrequencyCrossPowers(PSDs)•PCAtoextractprincipalcomponents=extractuncorrelatedphenomenaandcreatedreferencedspectraforload/responsedatausingtheneworthogonalreferencesbasis=preparationformultipleTPA14-LMSCompanyconfidential-2012InteriornoiseofvehiclesFrequency1000Hz10000HzBodystiffnessesglobalBodystiffnesseslocalBodydampingSoundpackage(trim)Structure-borne100Hz10HzAir-borne15-LMSCompanyconfidential-2012LMSSolutionUNIQUEmidfrequencysolutionFiniteElementsPredictSPLfromFEmodel.Uptos