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How can I compute MAAX and KAAX matrix , extracted from Nastran, to obtain the eigenvalues and eigenvector from a not constrained model ?

kenny.fernando.conto
How can I compute MAAX and KAAX matrix , extracted from Nastran, to obtain the eigenvalues and eigenvector from a not constrained model ?
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    Yes, you can do this... assuming there were no constraints in the 'creation' run, then as long as you do not add constraints in the 'assembly' run, then it will be free-free. Here is a sample input file. Please let me know if there are other questions...
     
    SOL 103
    CEND
    K2GG=KAAX
    M2GG=MAAX
    ECHO =NONE
    METHOD = 1
    DISP(plot)=ALL
    BEGIN BULK
    PARAM   POST   0
    EIGRL   1                      20     0                      MASS
     
    <include the grid definitions here>
    <include the KAAX/MAAX DMIG here>
     
    ENDDATA
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  • 0
    Yes, you can do this... assuming there were no constraints in the 'creation' run, then as long as you do not add constraints in the 'assembly' run, then it will be free-free. Here is a sample input file. Please let me know if there are other questions...
     
    SOL 103
    CEND
    K2GG=KAAX
    M2GG=MAAX
    ECHO =NONE
    METHOD = 1
    DISP(plot)=ALL
    BEGIN BULK
    PARAM   POST   0
    EIGRL   1                      20     0                      MASS
     
    <include the grid definitions here>
    <include the KAAX/MAAX DMIG here>
     
    ENDDATA
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