已阅读5页,还剩41页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
Structural AcousticAnalysiswithABAQUS AdditionalExamples Lecture6 深圳ABAQUS培训深圳ANSYS培训深圳ANSYS深圳ABAQUS深圳有限元培训ABAQUS培训ANSYS培训 Structural AcousticAnalysiswithABAQUS Overview SloshingEffectofSurfaceTreatmentsonRoomAcousticsNonlinearStructuralBehaviorCoupledPiezoelectricandAcousticAnalysisAcousticsofaTruckCab FullyCoupledAnalysisAcousticsofaTruckCab SequentialAnalysisSummary Structural AcousticAnalysiswithABAQUS Sloshing Structural AcousticAnalysiswithABAQUS Sloshing SphericalacousticradiationinMode1Reference Junger M C andFeit D Sound Structures andTheirInteraction MITPress pp 200 203 1972 PhysicalDescription Asteel r 7800kg m3 E 210GPa n 0 3 sphericalshellofradius1mandthickness0 05misimmersedinaninfinitevolumeofair r 1 25kg m3 K 128000Pa c 320m s Thesphereisdrivenasarigidbodytoexcitemode1usingthe BOUNDARY TYPE DISPLACEMENToption Afrequencyrangeof10Hzto204Hz correspondingtoka 0 2to4 0isanalyzedusing STEADYSTATEDYNAMICS DIRECT Nonconformingshell S8R andacousticinfiniteelement ACIN3D4 meshesareused Fluid solidcouplingthroughuseofthe TIEoption Structural AcousticAnalysiswithABAQUS Sloshing Meshes shellsinorange Structural AcousticAnalysiswithABAQUS Sloshing Pressuremagnitudesat158 7Hz Structural AcousticAnalysiswithABAQUS Sloshing Pressuremagnituderesultsfreq Hz kaNode1776Node35Analytical10 00000000 1963495412 515560002 516710002 5140472912 85690000 2524446414 206560004 208540004 2044314816 53000000 3245657917 080980007 084410007 0783558221 25240000 41728989812 032500012 038600012 030235127 32390000 53650352220 691600020 702600020 692059635 13010000 68977790035 980600036 001400035 987947745 16640000 88684019062 603100062 641500062 610501558 06990001856000105 924000105 79847974 65980001 46594174166 575000166 689000166 27310195 98930001 88474550238 751000238 874000237 975417123 4120002 42318895319 106000319 087000317 622889158 6700003 11547816412 658000412 448000410 202606204 0000004 00553063528 079000527 194000524 385853Analyticalsolution Structural AcousticAnalysiswithABAQUS EffectofSurfaceTreatmentsonRoomAcoustics Structural AcousticAnalysiswithABAQUS EffectofSurfaceTreatmentsonRoomAcoustics Example Smallroomcoupledtoinletandexhaustducts Uniformforcingatinletend Exhausttoexteriormodeledusingasmallhemisphereofairandthesphericalradiationcondition Atthefrequencyshown theinletexcitationhasexcitedastandingwaveintheroom Structural AcousticAnalysiswithABAQUS EffectofSurfaceTreatmentsonRoomAcoustics Acoustic onlymeshofroom ducts andexterior notreatment Structural AcousticAnalysiswithABAQUS EffectofSurfaceTreatmentsonRoomAcoustics Addacoustictreatmentstoceiling wall andfloorofroom Structural AcousticAnalysiswithABAQUS EffectofSurfaceTreatmentsonRoomAcoustics Withacoustictreatment Structural AcousticAnalysiswithABAQUS NonlinearStructuralBehavior Structural AcousticAnalysiswithABAQUS NonlinearStructuralBehavior Structuralanalysiscanincludeeffectsfromseveralsourcesofnonlinearity MaterialnonlinearitiesExamples Metalplasticity crushablefoamGeometricnonlinearitiesExamples Pre tensioningofacable snap throughbehaviorofanarchContactnonlinearitiesContactisinherentlynonlinearbecausethecontactconstraintsareeitheronoroff theydonotvarysmoothly Structural AcousticAnalysiswithABAQUS NonlinearStructuralBehavior MultistepanalysisGeneralanalysisstepscanhavelinearornonlinearbehavior Theendconditionofonegeneralstepprovidesthebasestateforthenextgeneralstep Ifanearliergeneralstepincludesnonlinearbehavior thenonlinearsolutionisincludedinsubsequentsteps Acousticanalysisincludestheeffectsofpreviousnonlineargeneralsteps Themostobviouseffectisaligningtheacousticregionwiththedeformedshapeofthestructure includingcontactregions Lessobviousisthechangeinmaterialproperties suchasstiffness Structural AcousticAnalysiswithABAQUS NonlinearStructuralBehavior Example Soundtransmissionthrougharubberdoorseal Step1 Staticstructuralanalysistodeformtherubbersealintoitsfinalposition Rigidsurfacemovesupward causingtherubbertodeform Acousticmeshisautomaticallyupdatedbasedwiththeuseofadaptivemeshing Structural AcousticAnalysiswithABAQUS NonlinearStructuralBehavior Step2 Steady statedynamicanalysisofthefullycoupledsystem Theairandtherubberinteractthroughtheirtiedsurfaces Acousticpressureisappliedasaboundaryconditiontoleftsideoftheairmesh Deformedsealinacousticmedium Contoursofacousticpressure Structural AcousticAnalysiswithABAQUS CoupledPiezoelectricandAcousticAnalysis Structural AcousticAnalysiswithABAQUS CoupledPiezoelectricandAcousticAnalysis PiezoelectricanalysisAnelectricpotentialgradientcausesstraining andstresscausesanelectricpotentialgradient Piezoelectricanalysisbyitselfisacoupledelectrical stressanalysis Canbecombinedinamodelwithacousticelementsandthenecessarystructural acousticcoupling Oftenusedinacousticsapplications suchasspeakers Solvedusing FREQUENCY MODALDYNAMIC STEADYSTATEDYNAMICS or STATIC Structural AcousticAnalysiswithABAQUS CoupledPiezoelectricandAcousticAnalysis Example fluid coupledmotionofatransducerHalf axisymmetricmodelofpiezoelectricsolid brassheadmass andfluid Structural AcousticAnalysiswithABAQUS CoupledPiezoelectricandAcousticAnalysis Applyelectricalforcingacrosspiezoelectricmaterialusingthe DSECHARGEor DECHARGEoptions CoupleacousticfluidtotheheadmasssolidelementsusingTIEconstraints Usewaterpropertiesandfluidelementstoapproximatehumantissue Modelradiationintothefluidexteriorusingthesphericalboundaryimpedance IMPEDANCEPROPERTY TYPE SPHERICAL Sweepthroughfrequenciesusingthe STEADYSTATEDYNAMICS DIRECTproceduretofindonsetofdegradedtransductionduetoheadmassvibration Structural AcousticAnalysiswithABAQUS CoupledPiezoelectricandAcousticAnalysis Acousticpressureat36866Hz Structural AcousticAnalysiswithABAQUS CoupledPiezoelectricandAcousticAnalysis Acousticpressureat37342Hz Headmassmodedistortsacousticfield Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Theobjectiveistoshowtheacousticfieldinandsurroundingamodeltruckcabduetotheeffectofloudspeakers Cabstructureismountedonfourelasticpoint mounts modeledassprings Restoftruckisomittedfromthisanalysis Interiorandexteriorairaremeshedautomaticallyusingtetrahedralelements Exteriorradiationismodeledusingsphericalradiationimpedance Cabstructureismodeledusingshellsandsolids fordashboardandseat Acousticexcitationduetoloudspeakersinsidecabismodeledasconcentratedloadsontheacousticfluid Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Exteriorandinteriorfluidmeshesareshownhere Neithermeshmatchesthecabshellmeshnode to node EachismodeledasaseparatepartandcoupledusingtheTIEconstraints Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Inexteriorproblemsitisgoodpracticetoinspectthephaseoftheacousticpressureatthelowestfrequencyofinteresttoseeiftheradiationconditionisperformingproperly Iftheradiationconditionisappliedincorrectly absent ortooclosetotheacousticsources thephasecontourswillshowdistortionneartheboundary Here thecontourslookallright Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Thedirectsteady statedynamicsprocedureisusedtosolvethecoupledfluid solidproblemat90frequencies UsingABAQUS Viewer weobserveapeakinthestructuralmotionamplitudeat110Hz Thisinvolveslargemotionsofthewindshieldandotherpanels Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Theinterioracousticpressurefield POR dB atthisfrequency Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Theexteriorfieldshowsradiationprimarilytothefrontandtop withapeakunderneaththecab Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Anotherstructuralpeakamplitudeoccursat298Hz directlyatthelocationoftheacousticsource Again sideandwindshieldpanelmotionsarethemostpronounced Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab FullyCoupledAnalysis Theexteriorfieldatthisfrequency 298Hz showsradiationfromthewindshieldandsidepanels Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Example TruckcabproblemusingsequentialanalysisThreevariationsarediscussedhere Theydifferonlyintheanalysisprocedureusedfortheglobalmodel Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Firstmethod Directsteady statedynamicsinbothanalysesGlobalmodel Definenodesetsandelementsetsasdescribedpreviously andsavetheneededresultstotheoutputdatabase odb orresults fil file Usedirectsteady statedynamicsoverthedesiredfrequencyrange Submodel Usedirectsteady statedynamicsoverthesamefrequencyrangeorasubsetofthisrange Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Computedporepressure PORdB forexterior below andinterior nextpage acousticfieldsarenearlyidenticaltothefullycoupledresults Global Directsteady statedynamicsSubmodel Directsteady statedynamics Fullycoupled Sequentiallycoupled Structural AcousticAnalysiswithABAQUS Nearlyidenticalbehaviorduetothelowforceamplitudeexertedonthestructurebytheair AcousticsofaTruckCab SequentialAnalysis Fullycoupled Sequentiallycoupled Global Directsteady statedynamicsSubmodel Directsteady statedynamics Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Secondmethod Naturalfrequencyextractionfollowedbymodalsteady statedynamicsintheglobalmodelComputeeigenmodesoftheuncoupledstructuralsystem Runthesteady stateprocedureatthesefrequencies andusetheseresultsastheforcingfunctionsforthesubmodelanalysis ThisprocedurewillIGNOREanydampingduetostructuralmaterialproperties butmodaldampingcanbeapplied Subsequently usedirectsteady statedynamicsfortheacousticssubmodel Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Firsteigenmodeoftheuncoupled undampedstructuralsystemisat108Hz usingfrequencyextractionprocedure Global Modalsteady statedynamicsSubmodel Directsteady statedynamics Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Themodalsteady statedynamicsprocedureyieldsthefollowingsolution displacementmagnitudes atthisfrequency Fullycoupled 110Hz Sequentiallycoupled 108Hz Global Modalsteady statedynamicsSubmodel Directsteady statedynamics Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Thedirectsteady statedynamicsprocedureisusedinthesubmodelatthesamefrequency interiorandexteriorairshown Fullycoupled Sequentiallycoupled Global Modalsteady statedynamicsSubmodel Directsteady statedynamics Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Thirdmethod Naturalfrequencyextractionfollowedbysubspaceprojectionsteady statedynamicsintheglobalmodelThenaturalfrequenciesandmodeshapesarecomputedasinthepreviousprocedure Thesubspaceprojectionsteady statedynamicsprocedureisusedfortheglobalmodel Thisprocedurediffersfromthemodalsteady statedynamicsprocedureinthattheoriginalsystemoffiniteelementequations includingstructuraldampingterms isprojectedontotheeigenmodes Structural AcousticAnalysiswithABAQUS AcousticsofaTruckCab SequentialAnalysis Thestructuralresponsesarereducedcomparedtothos
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 《行政职业能力测验》张家口市2022年公务员考试考前冲刺试卷含解析
- 2022年公务员考试菏泽市鄄城县《行政职业能力测验》高分冲刺试卷含解析
- 《行政职业能力测验》2022年公务员考试太原市阳曲县高分冲刺试卷含解析
- 幼儿园班级环境创设评比活动方案
- 桥式整流电路及工作原理详解
- 我国餐饮业特许经营发展对策研究
- 高中化学教案
- 小米智能家居业务竞争战略研究
- 下学期班主任工作总结 总结
- 上半年行政工作计划
- 2022年上海市土建质量员考试题库汇总(含基础和实务)
- 信息技术与学科教学的有效整合研究课题成果公告
- HF020控制器说明书详细版
- (A4)考察对象个人有关事项报告表(样表)
- 年产5.0万吨二甲醚的工艺设计(化学工程与工艺毕业设计).
- 国家特种设备目录
- 植物资源的调查与评价.ppt
- (完整word版)防水痘教案
- 《计量经济学》超全题库及答案(完整版)
- 论云南省金平县长安金矿矿石质量和加工(选冶)性能
- 苏宁易购物流配送的优化方案设计
评论
0/150
提交评论