Exercise5.docx
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Exercise5
Exercise5:
FighterJetVectoringNozzle
Inthisexercise,wewillperformastructuralanalysisofavectoringnozzleusedonahighperformancejetfighterengine.Today’sstate-of-the-artfighteraircraftareusingvectoringnozzletechnologytogainaperformanceedgeoverthecompetition.Airplanesarepropelledforwardbytheexpulsionofexhaustfromtheengine.Thrustvectoringisamethodofchangingtheexhaustinawaythatwouldcausetheaircrafttochangedirectioninamoreabruptmannerthancanbedonewithtraditionalcontrolsurfacessuchasflaps（ailerons,elevators,andrudders）.
Thenozzledesigninthisexercise（figurebelow）issimilarinconcepttooneusedinacurrentjetfighterengineinservicetoday.Itconsistsofaseriesofflapshingedtoaring（A）attheforwardsection,andconnectedtoasecondaryouterring（B）throughasetofstruts（C）.Movingtheouterringforwardorbackwardscontrolsthethroatareaofthenozzle.Vectoringisaccomplishedbytiltingtheouterring,ormovingitup/down/left/rightrelativetotheengineaxis.Thesemovementsarecontrolledbyaseriesofactuatorarmsconnectedtotheouterring（notshown）.
C:
Struts
A:
Flaphingering
B:
Outerring
Thenozzleisacomplexassemblyofseveralpartsactingtogether.ThegoalofthisanalysisistodemonstrateANSYS/Professional’sabilitytorecognizeassemblies,andautomaticallydetectandcorrectlymodelallcontactsurfaceswithnonlinearsurface-to-surfacecontactelements.Wewillthenusethismodeltodeterminethestressesanddeflectionsofthenozzleundertheextremeconditionsexperiencedduringanair-to-aircombatmission.Wewillusesymmetrytoouradvantageandmodela3-flapsegmentofthefullnozzle.
TheANSYS/ProfessionalMTBwillbeusedtoimporttheshellmodel.TheAutoContactfeaturewillbeusedtoautomaticallydetectandmodeltheassemblyinterfaceswithcontactelements.
Theassembly/contactcapabilityofANSYS/Professionalwillbeexplainedinthisexercise.BasicMechanicalToolbarinteractionisexplainedindetailinExercise1,whichwerecommendcompletingbeforestartingthisexercise.
Summaryofsteps:
1.LaunchANSYS/Professional
1.1.LaunchANSYSusingyourstartmenu
2.MechanicalToolbarSetup:
2.1.Toolbarsettings
3.Model:
3.1.ImportModel
3.2.AssignThicknesses
3.3.MaterialProperties
3.4.ContactDefinition
3.5.Meshing
4.Loads:
4.1.HingeConstraints
4.2.ActuatorArmDisplacements
4.3.PressureLoads
5.Solve
5.1.SaveModel
5.2.PerformSolution
6.PostProcessing
6.1.StressPlots
6.2.QueryResults
6.3.AnimateResults
6.4.ReportGeneration
7.Conclusions:
7.1.ExitANSYS.
Step-by-stepInstructions:
Beforebeginningthisproblem,createaseparatefolderonyourcomputerforthisjobandcopytheANSYSdatabasenozzlegeom.dbtothisfolderfromtheCD.
8.
LaunchANSYS/Professional
8.1.LaunchANSYSusingyourstartmenu
A.Browsetoselecttheworkingdirectoryyoujustcreatedforthisjob.
B.Enterajobname（nozzle1）.AllANSYSfilescreatedforthisproblemwillhaveafilenameofnozzle1followedbyauniqueextension.
C.Changetheworkspaceanddatabasesizesforthisjobtobe512and128respectively.
D.ClickRUNtostarttheANSYSGUI.
1.1.C
1.1.C
1.1.B
1.1.B
1.1.A
1.1.A
1.1.D
1.1.D
9.MechanicalToolbarSetup
9.1.Toolbarsettings.
A.Changetheunitstoinch-lbm-s-F
B.ChangethetitletoVectoringNozzleAnalysis
C.PicktheToobarPropertiesbutton
D.AToolbarPropertiesdialogwillappear.ChecktheEnableassembliesoption.Thisactivatesthefeaturethatautomaticallydetectsandcreatescontactsurfaces.Note:
YoumaynotseethisoptiondependingontheversionofANSYSyouarerunning.
E.
2.1.D
2.1.D
2.1.E
2.1.E
OK
2.1.C
2.1.C
2.1.B
2.1.B
2.1.A
2.1.A
10.Model
10.1.ImportModel.
A.PicktheModeltabintheMechanicalToolbar（MTB）.
3.1.A
3.1.A
B.Next,wewillimporttheNozzlegeometryfromanANSYSdatabase.（ANSYScanimportavarietyofgeometryformatsaswell）.PicktheImportGeometrybutton.
3.1.B
3.1.B
C.Adialogboxwillappearforyoutoselectthefiletoimport.ChangetheFilesoftypesettingtoANSYS（*db）
D.Selectnozzlegeom.db
E.
3.1.E
3.1.E
Open.
F.Ansyswillaskifyouwanttoimportthismodelasanassembly.PickYes.
3.1.F
2.1.A
10.2.AssignThicknesses:
A.
3.2.A
3.2.A
ANSYSwillpromptyouforasetofdefaultshellelementpropertiesforthemodel.EnteranameofActuatorArms,andathicknessof0.10.
B.OK.
C.Ourassemblywillhavethreeuniqueshellthicknesses.Let’sfirstassigntheActuatorArmspropertytotheentiremodel,andthenmodifytheothertwopropertiesafterwards.PicktheAssignShapebutton.
3.2.C
3.2.C
D.Adialogboxwillappearforyoutoselectareastoassignthispropertyto.ClickthePickAllbutton.
3.2.D
3.2.D
E.Next,wewilldefineathicknessfortheflaps.Inthedefaultshapeslist,pickShell.
3.2.E
3.2.E
F.Adialogwillappearforyoutodefineanewshellproperty.EnterFlapsforthename,and0.05forthethickness.
G.
3.2.F
3.2.F
PickOK.
3.2.G
3.2.G
H.PicktheAssignShapebuttonagaintoassignthispropertytotheflaps.
3.2.H
3.2.H
I.Adialogboxappearsforyoutoselecttheareastoassigntheflappropertyto.Changethemethodofselectionfromsingletoloop.Thismethodselectsallareasthatformacontinuousconnectionandisaneasywaytoselectallareasonapart.
3.2.I
3.2.I
J.
Pickoneareaoneachofthethreeflaps.ANSYSshouldselectallareasoneachflapforatotalof19areas.
3.2.J
3.2.J
K.Notethetotalselectedareasshouldbe19.PickOK.
3.2.K
3.2.K
Thetotalselectedshouldbe19.
Thetotalselectedshouldbe19.
L.
3.2.L
3.2.L
Theplotshouldchangetocolortheareasbasedonthepropertieswehavedefinedsofar.
M.Let’srepeatthisproceduretodefineathicknessfortheflapattachments.PickShellinthe
DefaultShapelist.
3.2.M
3.2.M
N.Forthepropertyname,enterFlapAttachment,andforthethicknessenter0.20.
O.
3.2.O
3.2.O
3.2.N
3.2.N
OK.
P.Toassignthenextproperty,itmaybeeasiertoviewlinesinsteadofareas.Clickandholdtheplotbuttonuntiltheflyoutappearsandpicktheplotlinesbutton.
3.2.P
3.2.P
Q.PicktheAssignShapebutton.
3.2.Q
R.Picktheareasattherearofeachflapthatconnecttothehingecylinders.Thereshouldbeatotalof8areas.Youmayhavetousethepan/zoom/rotatefunctiontoobtainabetterview.
3.2.R
3.2.R
S.OK.
3.2.S
3.2.S
T.ANSYSwillreplotyourmodelhighlightingallthethicknessassignments.Itshouldlookliketheplotbelow.
3.2.T
3.2.T
10.3.MaterialProperties.
A.Next,weneedtoassignthismaterialtothemodel.PicktheAssignMaterialbutton.
3.3.A
3.3.A
B.Adialogboxwillappearforyoutoselectamaterial.PickTitanium.
C.Continue.
D.IntheSelectAreasforMaterialdialog,clickthePickAllbutton
3.3.B
3.3.B
3.3.C
3.3.C
3.3.D
3.3.D
E.
3.3.E
3.3.E
Yourmodelshouldnowbecolorcodedtoindicateitisalltitanium.
10.4.ContactDefinition:
A.Wearereadytodefinethecontactsurfaces.ANSYScanautomaticallydetectareasthatareinornearcontactanddefinecontactpairs.ClickandholdtheView/ModifyContactbuttonuntilthefly-outappears.PicktheAutoCreateContactbutton.
3.4.A
3.4.A
B.
3.4.B
3.4.B
ANSYSwillsearchforsurfacesthatarewithinacertainproximitytoeachotherwhendefiningcontactpairs.Aproximitytoleranceof1（Tight）meansthatsurfacesmustbeexactlytouchinginorderforcontacttobedefined.Forourmodel,usethedefaulttolerance.PickOK.ANSYSwillcreatethecontactpairs.Thismaytakeafewminutes.
C.WhenANSYSfinishes,adialogwillappearindicatingthat64contactpairshavebeencreated.Thisdialogcontainsseveraloptionsasshownbelow.
ModifyContactPairNormals:
I.e.thenormaldirectionsofeachcontactpairmustpointtowardseachothertobecorrect.
ModifyContactPairNormals:
I.e.thenormaldirectionsofeachcontactpairmustpointtowardseachothertobecorrect.
D.
3.4.D
3.4.D
PicktheView/ModifyContactbutton.
E.Adialogwillappearwithallthecontactsurfaceslisted.Thefirstpairwillbehighlightedandshowningraphicswindow.
3.4.E
3.4.E
ContactPair1highlighted.
ContactPair1highlighted.
F.IntheView/ModifyContactPairsdialog,clickonContactPair3.
3.4.F
3.4.F
G.Thispairwillbehighlightedinthegraphicswindow.
3.4.G
3.4.G
H.
3.4.H
3.4.H
WithyourmouseintheView/ModifyContactPairsdialog,clicktherightmousebutton.
Rightclickmousewithcursorinthisdialog.
Rightclickmousewithcursorinthisdialog.
I.
3.4.I
3.4.I
Anoptionwillappearforyoutodeletethispair,ormodifyitsproperties.PickthePropertiesbutton.
J.Youcanmodifythenameforthiscontactpairtobesomethingmoredescriptiveifyoulike.Also,youcanchoosebetweenbondedorFrictionlessnon-separatingbehavior.Bondedisusefulfor“welding”twopartstogetherthathavedissimilarmeshes.Forourmodel,wewanttochangeallcontactsurfacestobefrictionlessnon-separating.Wecouldchangethemhere,butwewouldhavetodoeachoneindividually.Thereisaneasierway.PickCanceltoclosethisdialog.
3.4.J
3.4.J
K.
PickOKtoclosetheView/ModifyContactPairsdialog.
3.4.K
3.4.K
L.PicktheDefaultContactPropertiesarrowintheMTBandchangetheBondedbehaviortoFrictionlessNoSeparation
3.4.L
3.4.L
M.PicktheView/ModifyContactfly-outbutton.
3.4.M
3.4.M
N.AllcontactpairsshouldnowindicateFrictionlessSlidingcontact.PickOKtoclose
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