机械设计制造及其自动化 外文翻译 外文文献 英文文献 有限元分析系统的发展现状与展望Word文档格式.docx
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机械设计制造及其自动化 外文翻译 外文文献 英文文献 有限元分析系统的发展现状与展望Word文档格式.docx
《机械设计制造及其自动化 外文翻译 外文文献 英文文献 有限元分析系统的发展现状与展望Word文档格式.docx》由会员分享,可在线阅读,更多相关《机械设计制造及其自动化 外文翻译 外文文献 英文文献 有限元分析系统的发展现状与展望Word文档格式.docx(10页珍藏版)》请在冰豆网上搜索。
外文出处:
DepartmentofMechanicalEngineering&
BiomechanicsTheUniversityofTexasatSanAntonio
附件1:
外文资料翻译译文
Thefiniteelementanalysissystemdevelopmentpresentsituationandprospect
RavichandraPatchigollaandYeshP.Singh
Alongwiththedevelopmentofmodernscienceandtechnology,peopleareconstantlybuildmorefasttraffictools,largerbuildings,themorebigspanBridges,themorepowergeneratorsetsandmoreprecisionmechanicalequipment.Alltheserequireengineerinthedesigningphasecanaccuratelypredictproductsandengineeringtechnicalperformance,needtostructurestrengthandstaticanddynamictemperaturefield,flowfield,electromagneticfieldandseepageanalysisoftechnicalparameters.Forexampleanalysisandcalculationofthehigh-risebuildingsandlargespanbridgeduringanearthquake,lookattheimplicationswillhappendestructiveaccidents;
Analysisandcalculationofthetemperaturefieldofnuclearreactors,determinewhetherreasonableheattransferandcoolingsystem;
Analysisoffluiddynamicsinturbineblade,inordertoimprovetheoperationparametersofefficiency.Thesecanbesummedupinsolvingphysicalcontrolproblemspartialdifferentialequationsisoftenimpossible.InrecentyearsinthecomputertechnologyandthenumericalAnalysismethodsupportsdevelopedunderFiniteElementAnalysis(FEA)methodandFiniteElement,orderistosolvethecomplicatedengineeringAnalysisandcalculationproblemwhichprovidesaneffectiveway.Ourcountryoftheninthfive-yearplanperiodinpromotingCADtechnology,mechanicalindustryfromtheprevalencerateoflargeandmedium-sizedenterprisesCAD20%ofthefive-year"
end"
raisedtocurrent70%.AlongwiththeenterpriseCADwidelyapplied,Engineeringandtechnicalpersonnel,andalreadygraduallydumpboardwillfocusinhowtooptimizethedesign,improveproductquality,EngineeringandComputerAidedEngineeringanalysis(CAE,ComputersoftwareandapplicantsEngineering)methodwillbethekeytechnicalfactors.Inengineeringpractice,finiteelementanalysissoftwareandtheintegratedapplicationofCADsystemmakethedesignleveloccurredaqualitativeleap,mainlydisplaysinthefollowingaspects:
toincreasethedesignfunction,reducedesigncost;
•shortendesignandanalysisofcycle;
•increasethereliabilityofproductsandengineering;
•adoptingtheoptimizationdesign,reducematerialconsumptionorcost;
•inproductsmanufacturingorengineeringconstructionadvancefoundpotentialproblem;
•simulatevarioustestplantoreducethetimeandmoney;
•mechanicalaccidentanalysis,foundoutthecauseoftheaccident.
InpromotingCADtechnologytoday,fromhisbiketothespaceshuttle,allthedesignmanufactureisinseparablefromthefiniteelementcalculationandanalysis,intheengineeringdesignandanalysisFEAwillgetmoreandmoreextensiveattention.BelowistheSanFranciscobaybridgeseismicresponseanalysisoffiniteelementanalysismodel.
Developmentdirectionandsignificantprogressinearly20thcenturyworldattheendofthe1950sandearly1960sinvestedalotofmanpowerandmaterialresourcesdevelopmentwithpowerfulfeaturesoffiniteelementanalysisprogram.OneofthemostfamousisbyNASA(NASA)in1965entruststheAmericancomputingsciencecompanyandbelairsystemcompanydevelopedtheNASTRANfiniteelementanalysissystem.Thissystemhavebeendevelopeddozensofversion,istheworld'
slargest,thestrongestfunctionfiniteelementanalysissystem.Fromthentonow,theworld'
sresearchinstitutionsanduniversitiesaredevelopingabatchofsmallerbutflexible,pricelowerspecialorgeneralfiniteelementanalysissoftware,mainlyinGermanyPAFECASKA,British,FrenchSYSTUS,AmericanABQUS,ADINA,ANSYS,BERSAFE,BOSORCOSMOS,ELAS,MARC,STARDYNEetcproductswith.Today'
sinternationaldevelopmentoftheFEAmethodandsoftwareshowsthefollowingsometrendsfeatures:
1fromthepurestructuremechanicscalculationdevelopmenttosolvemanyproblemsofphysicalfieldfiniteelementanalysismethod(fromstructuredmatrixanalysis,evolvedgraduallyextendedtoboard,shellandentityetccontinuumsolidmechanicsanalysis,thepracticehasproveditisaveryefficientnumericalanalysismethod.Andtheoreticallyhasalsoproof,aslongastheunitusedforsolvingtheobjectofdiscretesmallenoughincomecanbeenoughsolutioninprecisionvalueapproach.Soinrecentyearshasprogressedtofiniteelementmethodoffluidmechanics,temperaturefield,electricconduction,magneticfield,seepageandproblemssolvingcalculationofacoustic,andrecentlydevelopedtosolveseveralinterdisciplinaryproblem.Forexamplewhenairflowsthroughahightower,andthedeformationofthetowerinturnaffectdeformationairflowflow...Thisneedswithsolidmechanicsandfluiddynamicfiniteelementanalysisresultscross,theso-called"
iterationfluidsolidcoupled"
problem.
2bysolvinglinearengineeringproblemsprogressedtotheanalysisnonlinearproblemswiththedevelopmentofscienceandtechnology,lineartheoryhasfarcan'
tmeetthedesignrequirements.Forexamplethehigh-risebuildingandconstructionindustry,theemergenceoflarge-spansuspensionbridgeisaskedtoconsiderstructureoflargedisplacementandlargestrainetcgeometricallynonlinear;
Aerospaceandpowerengineeringofhightemperaturepartsexistingthermaldeformationandthermalstress,alsowanttoconsidermaterialnonlinearproblem;
Suchasplastic,rubberandcompositematerials,etc.Variouskindsofnewmaterialappears,onlyonlinearcomputationtheorywouldnotbesufficienttosolvetheproblemsofusingnonlinearfiniteelementalgorithm,onlytosolve.Asisknowntoall,nonlinearnumericalcalculationisverycomplex,itinvolvesalotofspecialmathematicsproblemsandoperationskill,hardasgeneralengineeringtechnicianshands.ThereforeinrecentyearsabroadsomecompanyhasspentalotofmanpowerandinvestmentanddevelopmentsuchasMARC,ABQUSandADINAspecializesinsolvingnonlinearproblemssuchasthefiniteelementanalysissoftware,andwidelyusedinengineeringpractice.ThesesoftwareincommonisefficientnonlinearsolverandrichandpracticalnonlinearCaiLiaoKu.
3enhancevisualleadmodelingandreardataprocessingfunctionsearlyfiniteelementanalysissoftwareresearchemphasisonsolvingmethodisanewhighefficiencyandhighaccuracyunit.Alongwiththegradualimprovementmethodofnumericalanalysis,particularlytherapiddevelopmentofcomputeroperationspeed,thewholecalculationsystemforsolvingoperationslesstime,anddatapreparationandoperationresultperformanceproblemisgettingmoreandmoreoutstanding.Intoday'
sengineeringworkstation,solvingacontains10millionequationwiththefiniteelementmodelrequiresonlyafewminutes.Butifusemanualwaytobuildthemodel,andthenthecalculationresultishandlinglargeamountsoftimeneedsafewweeks.Itisnoexaggerationtosay,engineersinanalysisandcalculationhaveanengineeringproblemmorethan80%oftheenergyisspentondatapreparationandanalysisoftheresults.Sonowalmostallthecommercialfiniteelementprogramsystemhaspowerfulleadmodelingandreardataprocessingmodule.Inemphasizing"
visual"
today,manyproceduresareestablishedtoveryUserfriendlyGUI(with),littleUserwithvisualgraphicUsercanquicklywaygriddirectlygeneratefiniteelementanalysis,automaticdividingthedata,andrequiredtheamountofcalculationresultsconsolidationdeformationfigure,equivalenttocloud,facilitateextremumdistributionlistofsearchandrequireddataoutput.
4andseamlessintegrationofCADsoftwareoffiniteelementanalysissystemtodaywithgeneralanothercharacteristicistheintegrationofCADsoftwareinusenamely,completewithCADsoftwarecomponentsandpartsafterthemodellingdesign,automaticallygeneratingfiniteelementmeshandcalculate,iftheanalysisresultsdonotcomplywiththedesignrequirementsarecalculatedtorestartmodellingand,untilsatisfaction,thusgreatlyimprovethedesignlevelandefficiency.Today,engineerscanintheintegrationofCADandFEAsoftwareenvironmentquicklysolveainthepastcandealwithcomplexengineeringanalysisproblem.Sotoday'
sallcommercialfiniteelementsystemdevelopedandfamousauto-producersCADsoftware(forexamplePro/e,SolidEdge,SolidWorksUnigraphics,BentleyandAutoCAD,IDEAS,etc)interface.
5inthedevelopmentoftheWintelplatformofearlyfiniteelementanalysissoftwarearebasicallyinlargeandmedium-sizedcomputers(mainlyMainframe)onthedevelopmentoroperation,andlaterdevelopedtoEngineeringworkstations(EWS,EngineeringWorkStation)asaplatform,theircommoncharacteristicisalladopttheUNIXoperatingsystem.ThePChasmadetheapplicationofcomputerfundamentalchangeshappenedonherdesk,theengineereagertofinishcomplexengineeringanalysisdreamstobecomeareality.ButearlyPCusing16-bitCPUandDOSoperatingsystem,thememorydatablocklimitedpublic,sowasthesizeofthecalculationmodelshouldnotexceed1000orderequation.MicrosoftWindowsoperatingsystemandtheIntelPentiumprocessor32-bitforwilllaunchthePCprovidesnecessaryforfiniteelementanalysissoftwareandhardwareofthesupportplatform.ThereforetheinternationallyfamousfiniteelementprogramresearchanddevelopmentinstitutionshavetheirsoftwareshiftedtotheWintelplatform.ThetablebelowliststheADINAV7.3versionwiththePC'
sWindowsNTenvironmentandSGIworkstationandfourengineeringexamplecalculatedthetimeneededtosolve.Itshowsthe
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