有限元分析系统的发展现状与展望外文翻译.docx

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