机械毕业设计英文外文翻译基于虚拟样机技术的汽车驱动桥桥壳CADCAE系统的建立于研究.docx
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机械毕业设计英文外文翻译基于虚拟样机技术的汽车驱动桥桥壳CADCAE系统的建立于研究
附录A外文文献原文
A1EstablishandresearchonCA/CAEsysytemofautomobiledriveaxlehousingbasedonvirtualprototypetechnology
Virtualprototyperefertoamodelwhichisinthestepofproductprogress,occurringinthecomputerrealm,,aimingattheoptimizationbasedontheCADmodelusedtostimulatinganalysisproduct.Virtualprototypeinmainlyusedfortestwhichwasfailedbyphysicaltest.Basedontheresultwhichisdrawnfromthestimulationresult,itiseasytomodifyandguidedesign,untilreachtheoptimisticdesign
Automobiledriveaxlehousingisamainpartofamobile.disconnectdriveaxlehousingisusedforbearingthemobile’sweight,transferringtheloadtothewheelsDrawingforce,brakingforcelateralforceandverticalforcearetransferredtoframeandcompartmentbydriveaxlehousing.Sodriveaxlehousingiseitherabearingoratransmissionitem.Ifnotcorrectlydesignedorsomeproblemoccurredwhilemanufacturing,driveaxlehousingmaydeformedorfracture.Asatraditionaldesignmethodissocostlythatisnecessarytointroducethevirtualprototypetechnology.
A1.1designscheme
Traditionaldesignmethodfordriveaxlehousingisfirstlygivingascheme,manufacturing,asampleitemthenaseriestest(suchasstiffnesstestbendingfatiguetestandstaticstrenthtest)iscarriedoutApparentlythismethodisverymoneyconsuming,andthefinalparametermaybenotoptimal.ifadopttheVirtualprototypetechnologystimulazingkindsofworkingconditionofdriveaxlehousing,anddrawaseriesofoptimalparameters.Basedontheseparameterthephysicalmachinearecarriedouttodophysicaltest.thismethodcansavetime,cuttingthecost,thusbringinhugebenefittotheenterprise.
Moderntrialproductionprogressvarylargelytothetraditionalone.Asdepicted,inthepicture,Aloopisabsentinthetraditionaldriveaxlehousingmakingvirtualprototypecanassessthecostqualityandmanufacturabilityonthecomputer.Iftheassessmentisnotsatisfying,itisnecessarytoadjust.repeataloopuntilreachaidealparameter.
Thisschemedesignasoftwareterrace,providingainterfaceforSolidworkspatronandNastron,usingsuperiorityofthisprofessionalsoftware,anddevelopthesesoftware,butadriveaxlehousingproductdesignterrace.
Consideringthequestionofimprovingtheanalysisefficiencyandsimplifyingfiniteelement,thissystemadoptamethodwhichusesparametricmodelingthatistotallydifferentfromdomakeupforCADmodel.AndtheCADmodelisonlyusedforoversight
A1.2ParameterizedModelingbySolidWorks
Theyareallavailableforsecond-timedevelopmentofSolidWorksforthesoftwaresthatsupportOLEandCOM.Becauseofdesignrequirements,thedevelopmentsoftwareofthesystemisDelphiandseconddevelopmentsoftwareofSolidWorksisOLE.ThecopyrightofSolidWorksis2006.Tousethismethod,itmustberegisteredforauto-severedincludingfilessldworks.tlbandelementfilesthatfilenamesareSldWorks_TLB.passeveredbySolidWorksunderDelphiprogramenvironment,andtheyareavailableafterprogramsarecomplied.
ThetopologystructureofSolidWorksistypicallyfivelayerstopologystructure.Apartisconsistofbodies,andbodiesincludesurfaces,andsurfacesincludeedges,andedgesincludecurvesandpoints.Itmayuserecordindelphitodefinebodies,surfacesandpointsthesedatastructureandapplyrespectivelytostoretopologyinformation.ThestepsoftheparameterizedmodelingofCADbySolidWorksareasfollows:
firstly,itmustbedefinedcorrectlyfortherelationshipbetweenautomobiledimensionandotherdimensions.Secondly,initializethevariousrecordandauto-productthedrawingofaxlehousingusingAPIfunction.Lastly,itisavailableforuserstochecktheCADmodelandmodifyvariousdimensionsontheplate.Theprogramcanauto-modifytheotherrelativedimensionsandredrawthepictureinSolidWorksbyusingtherelationshipsthathavebeendefinedpreviously.
A1.3Patran&NastranFEAanalysis
A1.3.1PCLprogram
MSC/PATRANprovidesafullyfunctionsprogramlanguageforusers,asPCL.PCLprovideabundantoftablesandmenusandallowuserstoreadandwriteallinformationinPatrandatabase,whichstructureissimilarwithClanguage.Thepaperdevelopstheanalysismoduleoftheautomobiledriveaxlehousing,whichincludesparameterizemodeling,ALE,materialdefinition,loadcasesdefinition,Nastrananalysissubmittedandresultspost-possessingandotherfunctions.
TherearenospecialdevelopenvironmentinPCL,generallythecodesarewrittenintesteditorandsavedas*.pclformat,andthenthefilesarepre-compiledas*.cppformatinDOS,anddebugtheminPatranatlast.Thedetailoperatesareasfollows:
Pre-compile*.pclfile:
cpp*.pcl*.cpp
debug*.cppfileinpatran:
!
!
input*.cpp
Whenstarting,Patranwillexecuteinit.pclfileunderitsrootcatalogue.Thefileincludestwocommands:
!
!
INPUTp3prolog.pcland!
!
IPUTp3epilog.pcl.Aspre-compilethesetwofileswhenPatranstarts.UserscanwritecommandstoinitializePatranstartingviewport.Forexample,writecommands:
!
!
iputC:
\MSC.Software\MSC.Patran\2005_r2\rearhouse.cppandrearhouse.init()inp3epilog.pcl,inwhich,rearhouse.cppisthesecond-timedevelopmentprogramforautomobiledriveaxlehousing.Itwillinfluencethestartingspeed,forthis,userscanwriteself-definitionfunctionsandcompilethemintoadatabase,whichPatrancancalldirectly.Themethodisthat:
InputcommandsinPatran:
!
!
COMPLIErearhouse.cppintorearhouse.plb
!
!
libraryrearhouse.plb
!
!
llibrarkeepopenrearhouse.plb
Asthis,Patrancanloadincludingfileswhenitstartsandthespeedisratherfast.Forinitializetheviewport,usersneedtoinputthat:
rearhouse,init().
A1.3.2ProgramDesignFlowchar
TheFEAparameterizemodelingpartisimplementedasfollows:
Inputvariouskeyparametersintodelphi,andtheywillbecompiledandformatafilewhosesuffixis.cpp.Thecontentsofinit.pclcanbemodifiedbydephi.Asthat,userscanenterPatranbyclick“FEAparameterizemodeling”inthissystem,andtheywillseeanewfile,whosedrawingzonehascompleteFEAmodule.Theprogrampartsdon’tneedtocommunicatewithusersandjustlikeabackprogram.InthisprogressitwillneedAPIfunctionofWindowssystem.
DuetotheyrequirehighcommunicateforALE,materialdefinition,loadcasesdefinition,Nastrananalysissubmittedandresultspost-possessingandotherfunctions,whicharenotconvenientfordelphitocontroldirectly,thesepartswillbewrittenbyPCL.Patranmaycopythe.CPPfilestothecatalogsuchas“C:
\MSC.Software\MSC.Patra\2005_r2”,andmodifytherelativecontentsininit.pclfile.
Allowingforthespecialfeaturesofhousingmodelingandcomputingspeedofcomputers,theprogramalluseshellelementstosimulatehousing.Thereforeitusesgm_const_surface_extrude()toproductshellfunctionwhenmodeling,andusefem_create_mesh_surf_4()tomeshwhenFEAmeshing.
A1.4Softwareapplicationexample
Thissoftwareisestablishedbythedelphicomputerlanguage.Afterenterthesystem,preliminarydesignofautomobiledriveaxlehousingbybasismechanicsmustbecompletedtodefinethekeydimension,thenCAE/CADmodelingandanalyzingofvariousoperatingconditionsshouldbestarting.ThesoftwareinterfaceisshownintheFigureA1,FigureA2showsthesolidmodelofaxlehousingbySolidWorksparameterizedmodeling.
FigureA1Thesoftwareinterface
FigureA2Thesolidmodelofaxlehousing
TableA1illustratesmaterialparameterswhich
Component
Material
Modulusofelasticity
Poissonratio
Density
Driveaxlehousing
QT400-15
1.962E8KPa
0.3
7.8E-6kg/mm^3
Halfaxlecasing
45Mn2
2.1E8KPa
0.28
7.9E-6kg/mm^3
FiveoperatingconditionsareanalyzedbyPatran&Nastraninthissystem,whichareshowninFigureA5,staticof2.5timesfullload,drivingbythemaximumdrawingforce,brakeoffullload,turningaroundoffullload,brakeoffullloadinturningaround.Longitudinaldirection,sidedirection,verticaldirectionandrevolveoflongitudinaldirectionconstraintsarelaidonatthecenterofsteelplatespring.Loadislaidonatthehalfaxlecasing,whichresultingstressisinconsistentwithactualcondition,bringingnoimpactonstressofotherpartsofaxlehousing.TheresultshowsthatTrescastressonwheelsideislargerinTableA3.
TableA2Thestressofaxlehousingof5operatingconditions
Staticof2.5timesfullload
Drivingbythemaximumdrawingforce
Brakeoffullload
Turningaroundoffullload
Brakeoffullloadinturningaround
Stressincriticalsection
175
87
93.5
158
205
Theallowablestressofaxlehousingis400MPa,thedesignisverysafe,whichshownintheTableA2.Figure8illustratesthedistributionofstressnearbythesteelplatespring.
FigureA3Thedistributionofstressnearbythesteelplatespring
TableA3illustratestheformer9thordernaturalfrequencyofautomobiledriveaxlehousingbythissystem.
TableA3Theformer9thordernaturalfrequency
Order
1
2
3
4
5
6
7
8
9
Frequency
181.47
265.91
433.24
614.33
658.76
1119.9
1166
1347.4
1399.6
Sincetheroadisnotabsolutelysmooth,automobilenaturalfrequencyoftenoccurbetween1~20Hz.Resonanceofaxlehousingwon’tbecaused.Thisresultisreasonable.
FigureA4The1stordermodeofvibration
附录B外文文献中文翻译
A1基于虚拟样机技术的汽车驱动桥桥壳CAD/CAE系统的建立于研究
虚拟样机是指在产品设计阶段,在计算机世界中,以优化设计思想为指导,以产品CAD模型为基础,利用各种相关CAE分析软件,进行产品主要性能仿真分析的数字模型㈣。
虚拟样机主要进行对物理样机而言难以进行的试验,根据虚拟样机反馈的仿真结果,修正、指导设计,直至获得系统级的优化设计方案。
驱动桥桥壳是汽车上主要零件之一,非断开式驱动桥壳起着支承汽车荷重的作用,并将载荷传给车轮。
作用在驱动车轮上的牵引力、制动力、侧向力和垂向力也经过桥壳传到悬架及车架或车厢上。
因此,桥壳既是承载件又是传力件。
如设计不当或制造