Please help me with Nastran error..

SEONG
SEONG Altair Community Member
in Community Q&A

Hello~All

Help me…ㅠㅠ

I conducted the analysis using Nastran SOL103.

I am having trouble troubleshooting.

I have attached the relevant data.

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Best Answer

  • Luca Cavagna
    Luca Cavagna Altair Community Member
    Answer ✓

    As far as I understand, you are defining an RBE reference point from nodes which have only solid elements (solid element do not have rotational stiffness associated). So you need to correct your RBE3 cards and use only 123 instead of 123456

Answers

  • Jason_Craanen
    Jason_Craanen
    Altair Employee

    Hello

    You should reach out to Nastran support regarding any Nastran solver error.

    Thanks

  • Luca Cavagna
    Luca Cavagna Altair Community Member

    you should provide the .f06 file or part of it when FATAL occurs

  • SEONG
    SEONG Altair Community Member

    0S O R T E D B U L K D A T A E C H OENTRYCOUNT . 1 .. 2 .. 3 .. 4 .. 5 .. 6 .. 7 .. 8 .. 9 .. 10 .ENDDATA
    TOTAL COUNT= 1753606
    INPUT BULK DATA ENTRY COUNT = 1753611
    1 MODAL JANUARY 25, 2025 MSC Nastran 12/18/18 PAGE 38976
    MODE SHAPE0M O D E L S U M M A R Y BULK = 0
    ENTRY NAME NUMBER OF ENTRIES
    ---------- -----------------
    CHEXA 2811
    CQUAD4 820839
    CTRIA3 17390
    EIGRL 1
    GRID 868571
    MAT1 6
    PSHELL 5
    PSOLID 1
    RBE2 566
    RBE3 20249

    *** USER WARNING MESSAGE 285 (DML)
    FATAL ERRORS WERE FOUND WHILE READING THIS BEGIN SECTION
    MODEL SUMMARY DOES NOT INCLUDE COUNT OF FATAL ENTITIES
    ^^^^^^ >>> IFP OPERATIONS COMPLETE <<<
    ^^^*** USER INFORMATION MESSAGE 22964 (rmrgdrot_impl)
    One or more RBE3 elements have been detected for which the dependent GRID connects to solid elements only but
    dof 456 have been specified as part of REFC. In some cases, this may cause inefficient processing. Up to 50
    pairs of RBE3 and REFG with this occurring are listed below.
    User Action: If this is intentional, ignore this message, otherwise, you can set MDLPRM,RMRBE3RT,1 to
    automatically remove dof 456 from the REFC on these RBE3s.
    1855967 48743238
    1855968 48743239
    1855969 48743240
    1855970 48743241
    1855972 48743242
    1855973 48743243
    1855974 48743244
    1855975 48743245
    1855977 48743247
    1855978 48743248
    1855979 48743249
    1855980 48743250
    1855981 48743253
    1855982 48743254
    1855983 48743255
    1855984 48743256
    1855986 48743257
    1855987 48743258
    1855988 48743259
    1855989 48743260
    1855991 48743262
    1855992 48743263
    1855993 48743264
    1855994 48743265
    1855995 48743268
    1855996 48743269
    1855997 48743270
    1855998 48743271
    1856000 48743272
    1856001 48743273
    1856002 48743274
    1 MODAL JANUARY 25, 2025 MSC Nastran 12/18/18 PAGE 38977
    MODE SHAPE00

                    1856003    48743275
    
                1856005    48743277
    
                1856006    48743278
    
                1856007    48743279
    
                1856008    48743280
    
                1856009    48743283
    
                1856010    48743284
    
                1856011    48743285
    
                1856012    48743286
    
                1858002    48743287
    
                1858003    48743288
    
                1858005    48743289
    
                1858036    48743290
    
                1858039    48743292
    
                1858041    48743293
    
                1859573    48743294
    
                1859574    48743295
    
                1859575    48743298
    
                1859576    48743299

    ^^^*** USER FATAL MESSAGE 9002 (SUBDMAP IFPS)
    ERROR(S) ENCOUNTERED IN THE MAIN BULK DATA SECTION
    SEE MESSAGES ABOVE. ERROR ENCOUNTERED IN MODULE IFP,
    ^^^1 MODAL JANUARY 25, 2025 MSC Nastran 12/18/18 PAGE 38978
    MODE SHAPE00

    *** USER INFORMATION MESSAGE 4425 (PRTPRN)
    ONE OR MORE FATAL ERRORS HAVE OCCURRED. THERE MAY BE MORE ERROR MESSAGES IN THE PRECEDING OUTPUT
    1 MODAL JANUARY 25, 2025 MSC Nastran 12/18/18 PAGE 38979
    MODE SHAPE0

    • D B D I C T P R I N T * * * * SUBDMAP = PRTSUM , DMAP STATEMENT NO. 71

    0 * * * * A N A L Y S I S S U M M A R Y T A B L E * * * *
    0 SEID PEID PROJ VERS APRCH SEMG SEMR SEKR SELG SELR MODES DYNRED SOLLIN PVALID SOLNL LOOPID DESIGN CYCLE SENSITIVITY

    0SEID = SUPERELEMENT ID.
    PEID = PRIMARY SUPERELEMENT ID OF IMAGE SUPERELEMENT.
    PROJ = PROJECT ID NUMBER.
    VERS = VERSION ID.
    APRCH = BLANK FOR STRUCTURAL ANALYSIS. HEAT FOR HEAT TRANSFER ANALYSIS.
    SEMG = STIFFNESS AND MASS MATRIX GENERATION STEP.
    SEMR = MASS MATRIX REDUCTION STEP (INCLUDES EIGENVALUE SOLUTION FOR MODES).
    SEKR = STIFFNESS MATRIX REDUCTION STEP.
    SELG = LOAD MATRIX GENERATION STEP.
    SELR = LOAD MATRIX REDUCTION STEP.
    MODES = T (TRUE) IF NORMAL MODES OR BUCKLING MODES CALCULATED.
    DYNRED = T (TRUE) MEANS GENERALIZED DYNAMIC AND/OR COMPONENT MODE REDUCTION PERFORMED.
    SOLLIN = T (TRUE) IF LINEAR SOLUTION EXISTS IN DATABASE.
    PVALID = P-DISTRIBUTION ID OF P-VALUE FOR P-ELEMENTS
    LOOPID = THE LAST LOOPID VALUE USED IN THE NONLINEAR ANALYSIS. USEFUL FOR RESTARTS.
    SOLNL = T (TRUE) IF NONLINEAR SOLUTION EXISTS IN DATABASE.
    DESIGN CYCLE = THE LAST DESIGN CYCLE (ONLY VALID IN OPTIMIZATION).
    SENSITIVITY = SENSITIVITY MATRIX GENERATION FLAG.

    No PARAM values were set in the Control File.

    1 * * * END OF JOB * * *

    No Symbolic Replacement variables or values were specified.

  • Luca Cavagna
    Luca Cavagna Altair Community Member
    Answer ✓

    As far as I understand, you are defining an RBE reference point from nodes which have only solid elements (solid element do not have rotational stiffness associated). So you need to correct your RBE3 cards and use only 123 instead of 123456

  • SEONG
    SEONG Altair Community Member
    https://community.altair.com/discussion/comment/189346#Comment_189346

    Thank you.

    But MDLPRM, RMRBE3RT, 1 to
    automatically remove dof 456 from the REFC on these RBE3s.
    How do I do this??

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