有限元分析系统的发展现状与展望外文翻译.docx
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有限元分析系统的发展现状与展望外文翻译.docx
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有限元分析系统的发展现状与展望外文翻译
Finiteelementanalysissystemdevelopmentpresentsituationandforecast
Alongwithmodernscienceandtechnologydevelopment,thepeopleunceasinglyaremakingthefastertransportationvehicle,thelarge-scalebuilding,thegreaterspanbridge,thehighefficiencypowersetandtheprecisermechanicaldevice.Alltheserequestengineertobeablepreciselytoforecastinthedesignstagetheproductandtheprojecttechnicalperformance,needstobestatic,technicalparameterandsoondynamicstrengthtothestructureaswellastemperaturefield,flowfield,electromagneticfieldandtransfusioncarriesontheanalysiscomputation.Forexampleanalysiscomputationhigh-riseconstructionandgreatspanbridgewhenearthquakereceivestheinfluence,hasalookwhethercanhavethedestructiveaccident;Theanalysiscalculatesthenuclearreactorthetemperaturefield,thedeterminationheattransferandthecoolingsystemarewhetherreasonable;Analyzesinthenewleafbladethehydrodynamicsparameter,enhancesitsoperatingefficiency.Thesellmaysumupasthesolutionphysicsquestioncontrolpartialdifferentialequationsoftenisnotimpossible.
Inrecentyearsthefiniteelementanalysiswhichdevelopsinthecomputertechnologyandunderthenumericalanalysismethodsupport(FEA,FiniteElementAnalysis)thesideprincipleforsolvesthesecomplexprojectanalysisestimationproblemstoprovidetheeffectiveway.Ourcountryin"95"PlanperiodvigorouslypromotestheCADtechnology,mechanicalprofessionlargeandmiddlescaleneterriesCADpopularratefrom"85"End20%enhancesthatpresent70%.WithenterpriseapplicationofCAD,engineeringandtechnicalpersonnelhasgraduallygetriddrawingboard,andwilljointhemainenergyhowtooptimizethedesign,engineeringandimprovingthequalityofproducts,computer-aidedengineeringanalysis(CAE.ComputerAidedEngineering)methodandsoftwarewillbethekeytechnicalelements.
lnengineeringpractice,finiteelementanalysissoftwareandCADsystemintegrationdesignstandardsshouldbeaqualitativeleap,mainlyinthefollowingaspects:
Theincreasedesignfunction,reducesthedesigncost;
Reducesdesignandtheanalysiscycleperiod;
Increaseproductandprojectreliability;
Usestheoptimizeddesign,reducesthematerialtheconsumptionorthecost;
Discoversthelatentquestioninadvancebeforetheproductfactureortheprojectconstruction;
Simulateseachkindofexperimentalplan,reducestheexperimentaltimeandthefunds;
Carriesonthemachineaccidenttoanalyze,searchaccidentcausefactor.
InvigorouslypromotestheCADtechnologytoday,fromthebicycletotheaerospacecraft,alldesignsmanufactureallwillnotbeabletoleavethefiniteelementanalysiscomputation,FEAobtainsthemoreandmorewidespreadvalueintheengineeringdesignandtheanalysis.ThenextchartistheAmericanSanFranciscobaybridgeearthquakerespondsthecomputationthefiniteelementanalysismodel.Thedevelopmentdirectionandonsignificantprogressinternationalearly20thcenturyintheendofthe50's,atthebeginningofthe60'shastheformidablefunctionontheinvestmentmassivemanpowerandthephysicalresourcedevelopmentthefiniteelementanalysisprocedure.Whatismostfamouswas(NASA)entrustsUSbyAmericancountrySpaceAgencyin1965tocalculatetheNASTRANfiniteelementanalysissystemwhichthescientificcompanyandtheBellaerospacesystemcompanydeveloped.
Thissystemdevelopmentuntilnowhadseveraldozenseditions,isinthepresentworldthescaleisbiggest,thefunctionstrongestfiniteelementanalysissystem.Fromatthattimetothepresent,theworldeachplacedevelopmentfacilityandtheuniversityalsodevelopedonebatchofscalessmallerbuttousenimble,thepriceislowerspecial-purposeorgeneralfiniteelementanalysissoftware,mainlyhadGermanASKA,England'sPAFEC,France'scompany'stheandsoonSYSTUS,US'SABQUS,ADINA,ANSYS,BERSAFE,BOSOR,COSMOS,ELAS,MARCandSTARDYNEproduct.NowontheinternationalFEAmethodandthesoftwaredevelopmentpresentsbelowsometendencycharacteristics:
1.developsfromthepurestructuremechanicscomputationtosolvesmanyphysicalfieldsquestionfiniteelementanalysismethodmostearlyiscomesfromthestructurematrixanalysisdevelopment,graduallypromotestotheboard,theshellandtheentityandsoonthecontinualbodysolidmechanicsanalysis,thepracticeprovedthisisoneextremelyeffectivenumericalanalysismethod.Moreovertheoreticallyalsoalreadyproved,solongasusesintobeseparatedsolutionobjectthe
unitenoughtobesmall,theobtainedsolutionmayenoughapproachtotheprecisevalue.
Thereforetherecentyearsfiniteelementmethodhasdevelopedquestiontheandsoonhydromechanics,temperaturefield,electricityconduction,magneticfield,transfusionandsoundfieldsolutioncomputation,recentlydevelopedsolvesseveralinterdisciplinarystudies.thequestions.Forexamplewhentheaircurrentflowsaveryhighirontowertohavethedistortion,butthetowerdistortioninturnaffectstotheaircurrentflows.Thisneedstousethesolidmechanicsandthehydrodynamicsfiniteelementanalysisfinallyoverlappingiterationsolves,namelyso-called"Flowssolidcoupling"Question.
2Progressesfromthesolutionlinearprojectquestiontotheanalysisnon-linearproblemalongwiththescienceandtechnologydevelopment,thelineartheoryalreadybyfarcouldnotsatisfythedesigntherequest.Forexampleinconstructionprofessionhigh-riseconstructionandgreatspanhangingbridgeappearance,requestconsiderationgeometrynon-linearproblemandsoonstructurebigdisplacementandbigstrain;Astronauticsandpowerengineeringhightemperaturepartexistencethermaldeformationandthermalload,alsomustconsiderthematerialthenon-linearproblem;Suchastheplastic,therubberandthecompoundmaterialandsooneachkindofnewmaterialappearance,onlydependsonthequestionwhichthelinearcomputationtheoryisinsufficienttosolvemeets,onlyhasusesthenon-linearfiniteelementalgorithmtobeabletosolve.Itiswellknown,thenon-linearvaluecomputationisverycomplex,itinvolvestotheverymanyspecialmathematicsquestionandtheoperationskill,thanksthegeneralengineeringtechnicalpersonneltograspverymuch.HasspentmassivespecialtyandsoonmanpowerandinvestmentdevelopmentsuchasMARC,ABQUSandADINAforthisrecentyearsoverseassomecompaniestosolutionnon-linearproblemfiniteelementanalysissoftware,andwidelyappliestotheprojectpractice.Thesesoftwarecommoncharacteristicsarehavethehighlyeffectivenon-linearsolutionaswellasrichandthepracticalnon-linearmaterial.Definitely.
3
Theenhancementvisiblepretagemodellingandthepostpositioneddata
processingfunctionearlytimefiniteelementanalysissoftwareresearchkeyliesininfersnewhighefficiencysolutionmethodandthehighaccuracyunit.Alongwiththenumericalanalysismethodgraduallyconsummation,thecomputeroperatingspeedrapiddevelopment,theentirecomputingsystemusesintosolvetheoperationin
particularthetimemoreandmorefew,butthedatapreparationandtheoperationresultperformancequestiondaybydayisactuallyprominent.Onthepresentprojectworkstation,solvestocontain100,000equationsthefinitelementmodelsonlytoneedtouseseveraldozensminutes.Butifestablishesthismodelwiththemanualway,thentherehandlingmassivecomputedresultmustuseseveralweek-longtime.Maynotexaggeratesaid,engineercalculatesaprojectquestionwhentheanalysishas80%abovetheenergyalltospendinthedatapreparationandtheresultanalysis.Thereforethepresentnearlyallshangyefiniteelementsoftwareallhasthefunctionverystrongpretagemodelingandthepostpositioneddataprocessingmodule.Isemphasizing"Visible"Today,verymanyprocedureshaveallestablishedtouserextremelyfriendlyGUI(GraphicsUserInterface),enablestheuserdirect-viewingfasttocarryonthegridautomaticdivisionbythevisiblegraphicmode,theproductionfiniteelementanalysisneedsthedata,andthemassivecomputedresultwillreorganizethedistortionchart,theequivalentdistributioncloudchartaccordingtotherequest,willbeadvantageousfortheextremevaluesearchandneedsthedatatotabulatetheoutput.
4WiththeCADsoftwareseamlessintegrationnowthefiniteelementanalysissystemanothercharacteristicisandthegeneralCADsoftwareintegratedusenamely,afterusesCADsoftwaretocompletethepartandthecomponentsmodelingdesign,automaticallyproducesthefiniteelementgridandcarriesonthecomputation,ifanalyzestheresultdoesnotconformtothedesignrequirementthenrecarriesonthe
modelingandthecomputation,untilsatisfaction,thusenormouslyraisedthedesignlevelandtheefficiency.
Thecomplexprojectanalysisquestiontoday,whichengineermayquicklysolvesinintegratedCADandintheFEAsoftwareenvironmentinbeforeisunabletodealwith.ThereforenowallshangyefiniteelementsystembusinessallhasdevelopedandfamousCADsoftware(forexamplePro/ENGINEER,Unigraphics,SolidEdge,SolidWorks,IDEAS,BentleyandAutoCADandsoon)connection.
5BasicallyinWintelplatformdevelopmentearlytimefiniteelementanalysissoftwareallisinthelargeandmiddlescalecomputers(mainlyisMainframe)onthedevelopmentandthemovement,afterwardsalsodevelopedtaketheprojectworkstation(EWS,EngineeringWorkStation)astheplatform,theircommoncharacteristicallusestheUNIXoperatingsystem..ThePCmachineappearancecausedthecomputertheapplicationtohavehefundamentalchange,engineerhad
longedfor
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