actran声辐射计算教程.pdf

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1、WS9-AcousticRadiationwithRADACTACTRANTraining:ACOUSTICSCopyrightFreeFieldTechnologiesContentIntroductionRADACT-DirectfrequencyresponseBuildingRADACTinputfilePre-processingComputationPost-processingRADACT-GreenanalysisEditingRADACTinputfilePre-processingC

2、omputationPost-processingGoingfurther2CopyrightFreeFieldTechnologiesIntroductionPre-requisites-beforegoingthroughthispresentation,thereadershouldhavereadandunderstoodthefollowingpresentations:TheoryAcousticSimulationsTheoryAcousticBCMESHTheobjectivesofthiswo

3、rkshoparethefollowing:ExplainhowtouseActranRADACTinordertogenerate,computeandpost-processtheacousticradiationofapre-computedvibratingstructureTheActranmodelsgeneratedthroughRADACTinthisworkshopcorrespondtoaDirectfrequencyanalysis(part1)andaGreenanalysis(part2)of

4、afreefieldacousticradiationproblemusingIFEapproachandBC_MESHfeature.3CopyrightFreeFieldTechnologiesModelingProcessNASTRANMeshandNastranResultsMapsAutomaticRADACTRunandPost-AcousticMesh(BDFformat)InputFileProcessingFRFsWaterfall4CopyrightFreeFieldTechnologiesWorksh

5、opDescriptionThevibrationofthefollowinggearboxhasbeencomputedusingNASTRANThevibrationareavailablefrom10Hzto2010Hzwithastepof100HzintheOP2formatTheobjectiveistostudythenoiseradiatedDisplacementat510Hzbythisgearboxinfreefieldassumingthattheexcitationandradiationp

6、rocessesareweaklycoupled5CopyrightFreeFieldTechnologiesStructureTheNASTRANresultfile(structure.op2)containsthedisplacementofthegearboxfrom10Hzto2010Hz,stepof100Hz.3subcases:2,3and4areavailableinthisOP2file.Twosurfaces:PID16andPID17radiatetheacousticenergyinfree

7、field.PID17PID166CopyrightFreeFieldTechnologiesAcousticmeshAcousticmesh(fluid.bdf)consistsof:One3Delementsettomodeltheacousticmesh(blue)One2Delementsettomodelthecouplingsurface(brown)One2Delementsettomodeltheinfiniteelements(yellow)InfiniteelementsAcousticmesh

8、2DElementset(id6)3Delementset(id1)Couplingsurface2DElementset(id2)7CopyrightFreeFieldTechnologiesPart1:DirectFrequencyResponseBuildingRADACTinputfileCop