利用Hypermesh和nastran创建mnf流程Word格式文档下载.docx
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利用Hypermesh和nastran创建mnf流程Word格式文档下载.docx
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EIGRL30D|~-1.O^OC|~~:
MASg
3.对控制卡进行设置
(1)sol
SOL103
(2)PARAM
GRDP_W|
PARAM,GRDPNT,G
(3)case_unsupported_cards
ControlCard
nDAMSMNFFLEXBODV=VESvOUTCSTRN=VES,OUTGSTRS-NO
R£
SUEC=N0
GPSTRniN(PLOT)=ALL
OUTPUT(POST)
SURFACE1D1SET100NORMALX3FIBRE=Z1
ADAMSMNFFLEXBODY=YES,OUTGSTRN=YES,OUTGSTRS=NORESVEC=NO
GPSTRAIN(PLOT)=ALL
SURFACE101SET100NORMALX3FIBRE=Z1
(4)bulk_unsupported_cards
DTI,UNITS,1,KG,N,M,S
(5)global_case_control
Output栏中
相关文档;
TranslatingMSC.NastranData
TherearetwodifferentinterfacesthatyouusetotranslateMSC.NastrandataforuseinADAMS/Flex.Learnabout:
*UsingMSC.Nastran2004andAbove
«
VerifyingtheModel
*ComputingStress/StrainModes
*XRBSupportforStress/StrainModes
*ShortenedStress/StrainModes
UsingMSC.Nastran2004andAbove
Startinginversion2004,MSC.Nastranprovidesanimprovedinterfaceforgeneratingmodalneutralfiles(MNFs)E3.ThenewMSC.Nastran
ADAMSInterfaceallowsyoutogenerateanMNFdirectlyfrom
MSC.NastranwithoutgeneratinganOUTPUT2file.TheMSC.NastranADAMSInterfacedoesnotrequireaDMAPalteroratranslatortoconvertMSC.NastranoutputfilestoMNFs.
TheMSC.NastranADAMSInterfaceisalicensedfeatureof
MSC.Nastran.Formoreinformation,contactyourlocalsalesrepresentative.IfyoualreadyhavetheMSC.NastranADAMSInterfacelicense,refertotheMSC.NastranQuickRefereneeGuide
andRefereneeManualforinformationonhowtouseit.
VerifyingtheModel
TheMSC.Nastrantranslatorwritesasummaryofthemodalneutral
file(MNF)CHexporttotheterminalwindow.Ifyouareusing
MSC.Nastran2004orabove,theADAMSinterfacewritesasummaryoftheMNFexporttotheMSC.Nastranoutputfile.Pleasereviewthisdataforanyconcerns.Inparticular,ensurethatthe:
Mass,centerofmasslocation,andmomentsofinertiaareasexpected.
DuringtheMNFwrite,theconstraintmodesandtheconstrainednormalmodesareorthogonalized.Thisyieldsmodesthatare:
oAnapproximationofthefree-bodynormalmodes.oInterfacemodes,wheretheinterfaceisthecollectionofalltheattachmentpointDOFs.
Also,verifythatthefreebodynormalmodeshaveareasonablenaturalfrequency.Youshouldexpecttoseesixrigid-bodymodes,uniessdisplacementboundaryconditionsarepresent.
ComputingMSC.NastranStress/Strain
Modes
ForADAMS/Durabilitytoprocessstressesorstrainsonflexiblebodies,modalstressorstrainshapesneedtobepresentinthemodalneutral
file(MNF)G3oftheflexiblebody.YoudothisbyhavingMSC.Nastran
recoverastressorstrainmodeforeverymodeshapecomputedfor
ComponentModeSynthesis(CMS).
MSC.NastranGridPointStresses
・Example
KnownLimitations.Problems,andRestrictions
MSC.NastranGridPointStresses
BecausemodalinformationcontainedintheMNFcanonlybeassociatedwithnodes,theMSC.Nastrangrid-pointstressdatarecoveryoptionisrequired.ThefollowingCaseControlcommandsarerequiredintheMSC.NastraninputfiletocomputestressorstrainmodesfortheMNF:
GPSTRESS:
Requestsgridpointstressesoutput.
*GPSTRAIN:
Requestsgridpointstrainsoutput.
STRESS(PLOT):
Requestselementstressoutput.
*STRAIN(FIBER,PLOT):
Requestselementstrainoutput.
•OUTPUT(POST):
Delimiter.
SET:
Definesasetofelementsforasurfaceorvolume.
•SURFACE:
DefinesasurfaceofplateelementsrefereneedbytheSETcommand.
*VOLUME:
DefinesavolumeofsolidelementsrefereneedbytheSETcommand.
Formoreinformationonthesecommands,seetheCaseControl
sectionoftheMSC.visualNastranQuickRefereneeGuide.Formore
informationoncomputinggridpointstresses,seetheMSC.Nastran
LinearStaticAnalysisUser'
sGuide.
Notes:
YoucanonlytransferonesurfacestressorstrainfiberofplateelementstotheMNFforprocessinginMSC.ADAMS.IfmorethanonefiberisspecifiedontheSURFACEcard,themsc2mnftranslatorissuesawarningmessageandonlytransfersthefirstsurfacestressfiberitfindsintheOUTPUT2file.
IncludingstressorstrainmodesintheMNFcansignificantlyincreasethefilesize.Therefore,itbecomesevenmoreimportanttooptimizetheMNFifpossible.ForinformationonoptimizingtheMNF,seeOptimizinganMNF.Includingbothstressandstrainmodeswill
furtherincreasethesizeoftheMNFandisgenerallynotrecommendedforlargemodels,uniessbothquantitiesareneeded.
WhendefiningsubcasesinCaseControl,youmusthavetheGPSTRESS,GPSTRAIN,STRESS,andSTRAINcardsbeforethe
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- 利用 Hypermesh nastran 创建 mnf 流程