Superelement Model Conversion

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi

I've a superelement model in nxnastran and i'd like to convert it for optistruct format (16bit) with different units (from mNN mm to N mm)

Any suggestions? Regards

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi,

    You can directly work on Nastran file in OptiStruct profile and save as .fem (OS) file and can run the analysis. There is no conversion required for Nastran file to OptiStruct.

    User has to follow a consistent unit system. If user want to follow  N mm unit system, user has to change the unit system manually and has to follow a consistent unit system.

    The basic consistent unit system followed is attached along.

    <?xml version="1.0" encoding="UTF-8"?>Capture.PNG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    How to do? I have an .txt and .pch

     

    I want to change from mN-mm to N-mm

    Regards

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi,

    You can include the pch file. In Analysis> Control cards> Include_Bulk, provide the path to and the name of the file to be included.

    1mN-mm is 0.001 N-mm. 

    There are many online unit converter tools available. Update all the units (Rho, E...etc) accordingly to the unit system followed.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Thanks George,

     

    I know 1mN-mm is 0.001 N-mm but I don't know how to reconvert manually the .pch file? Do i need to change the value for any single KGBOX manually?

    Example 

    mN-mm

     

    DMIG*    KGBOX                     12522               2
    *                   12521               1 6.307481517E+04
    *                   12521               2-1.745010826E+04
    *                   12521               3 1.500132835E+05
    *                   12521               4-8.455473220E+06
    *                   12521               5-1.979675434E+06
    *                   12521               6-1.243141111E+06
    *                   12522               1-1.561769361E+09
    *                   12522               2 3.627508327E+08
    *                   12522               3-1.243141111E+09
    *                   12522               4-1.979675434E+10
    *                   12522               5 4.110513817E+11

     

    I wanto to change in N-mm. I have to change manually the values?

    Regards

     

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Thanks George,

     

    I know 1mN-mm is 0.001 N-mm but I don't know how to reconvert manually the .pch file? Do i need to change the value for any single KGBOX manually?

    Example 

    mN-mm

     

    DMIG*    KGBOX                     12522               2
    *                   12521               1 6.307481517E+04
    *                   12521               2-1.745010826E+04
    *                   12521               3 1.500132835E+05
    *                   12521               4-8.455473220E+06
    *                   12521               5-1.979675434E+06
    *                   12521               6-1.243141111E+06
    *                   12522               1-1.561769361E+09
    *                   12522               2 3.627508327E+08
    *                   12522               3-1.243141111E+09
    *                   12522               4-1.979675434E+10
    *                   12522               5 4.110513817E+11

     

    I wanto to change in N-mm. I have to change manually the values?

    Regards

     

    Any idea?

    Regards

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    @bmech

     

    There is no way to change the units in OptiStruct. you may have to do it manually.

     

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