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1、MDNastran/MSC.NastranCurrentErrorListCurrentUpdate:Jan14,2011-----------------------------------------Thisfilecontainsa.All"GeneralLimitations"b.Allerrorsthathavenotbeencorrectedinareleasedversion.IftheVersion="GL"thenthisindicatesaGeneralLimitationwhichindicatesafixisnotplanned.
2、ContinuousupdatestotheerrorlistareavailabletoMDNastran/MSCNastranclientsontheMSCSimCompanionwebpagehttp://simcompanion.mscsoftware.com/infocenter/index?page=content&id=KI8008006TheMSCSupportpagescanalsobeusedtosearchforkeywordstoeasilylocateindividualerrors-http://simcompanion.ms
3、csoftware.comKnownErrorCR890ProductMSC/MDNastranCorrectedVersionGLAbstractGridPointForce-GPFDR-UFM3008DescriptionTheopencorerequirementfortheGPFDRmodulecanbeaslargeas(6XBUFFSIZE+14Xnumberofgrids)ifthegridsuseanonrectangulardisplacementcoordinatesystem.Forproblemsinbasiccoordinate
4、s,thegridrequirementdropsto8Xnumberofgrids.KnownErrorCR1103ProductMSC/MDNastranCorrectedVersionGLAbstractDynamicResponse-TRD,TRD1,FRRD,FRR-UFM3005DescriptionIftheMGIVmethodofrealeigenvalueextractioncomputesmodesformasslessDOFwithuncoupledstiffnessterms,theeigenvalueislarge(1.E+35
5、)asitshouldbe,butthegeneralizedstiffnessis0.0(itshouldalsobe1.E+35).Nulleigenvectorsmaybeproduced.AnavoidanceistousePARAM,HFREQorPARAM,LMODEStodiscardthesebadmodesindynamics.KnownErrorCR1758128ProductMSC/MDNastranCorrectedVersionGLAbstractCyclicSymmetry-Restarts-VariousDescriptio
6、nInsuperelementstaticcyclicsymmetry(SOL81),somerestartpathsdonotfunctionwell.Thefollowingrestartpathshavebeendemonstratedtowork,usingtheindicatedinputandDMAPAlters.Othertypesofrestartscanbemade,usingthesetechniques.A.ConventionalSuperelementRestarts.Usethesametechniquesapplicable
7、tononcyclicsymmetrysuperelementanalysis.1.ExitduringPhaseI.2.StructuralChangesinaSuperelement.3.LoadChangeRestartB.TimeLimitinaHarmonicLoopSETN=0,residualonlySEMG=NPARAM,RESDUAL,-1(bulkdata)Inputallbulkdata,orusePARAM,NODATA,-1anddeleteallthebulkdataexceptPARAMentries.C.LoadsChan
8、geinOneTipSuperelement,SameNumberofLoadi
