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节交互式频率响应表概述案例研究结论培训.pptx

节交互式频率响应表概述案例研究结论培训.pptx

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SECTION13INTERACTIVEFREQUENCYRESPONSE

TABLEOFCONTENTS Page OVERVIEW 13-3 CASESTUDY 13-7 CONCLUSION 13-27

OVERVIEWWhenusingtheModalFrequencyResponseMethod(SOL111),theFrequencyResponseCalculationisessentiallyacheappost-processingoperationontheModalData.InteractiveFrequencyResponsetakesadvantageofthisbyallowingasingleMSC.Patransessionto:RunaNormalModesAnalysis(SOL103withanAlter)SavetheDBALLfromthisrunSetuptheFrequencyResponsedefinitionUsetheModalresultsintheDBALLtocalculatetheFrequencyResponseanalysisSetupfurtherFrequencyResponsecalculationsasrequired,reusingtheDBALLandsavingCPUtime

OVERVIEW(Cont.)ToinvoketheInteractiveFrequencyResponseoptionanenvironmentvariabledefinitionisrequiredonthehostcomputer(shownonnextslide)ThefollowingwillthenbeenabledTheSolutionTypeMenuinPatranwillhaveanextraoptionfor‘InteractiveModalAnalysis’IntheAnalysisMenutheactionAnalyzewillhaveanextraoption‘Interactive’

OVERVIEW(Cont.)InteractiveNASTRAN$NASTRANinputfilecreatedbytheMSCMSC.Nastraninputfile$translator(MSC.Patran2000r4)$DirectTextInputforFileManagementSection$NormalModesAnalysis,DatabaseSOL103includeSSSALTERDIR:run0a.v2001TIME600$DirectTextInputforExecutiveControlCENDBDFextractshowingnewAlter.ToactivateInteractiveNASTRANsetEnvironmentVariableto:INTERACTIVE_NASTRANTRUEInteractiveoptionforNormalModesisthenenabled.

AnalternativemethodtoinvoketheInteractiveOptionsistousetheInteractiveNastranmenupick,locatedintheToolsMenuunderpre-releaseOVERVIEW(Cont.)

CASESTUDYWenowdemonstratethesetupoftheInteractiveFrequencyResponseoptionusingthetowerstructurewehaveusedbeforeTheobjectiveofthisanalysisistousetheInteractivetechniquetoquicklyandcheaplyexploretheeffectof3levelsofdampingonthestructure

CASESTUDY(Cont.)TheNastranbulk

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