GROUND CHECK

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

Dear All,

I have to see output in G-set, N-set, A-set, F-set... etc format like nastran for natural frequency analysis.

Will you please help me to get this output using optistruct?

Further i am not able to use ARG2(1) and ARG3(1) ?

What is value of ARG3(1)?

 

Thanks & Regards,

Rahul

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

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Hello All,

     

    Can anyone help me on above topic?

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Are you running analysis in Optistruct ?I too dont see information on ARg2 & ARG3 in documentation. But it should work with ARG1 PRINT & Opion set to yes.

    If get any error please share.

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Yes Rahul i am running with optistruct. I have solved with  ARG1 PRINT & Opion set to yes. I didn't get any error. But output format is not like nastran.

    Below i have attached screen shots of Nastran & opti out file for GROUNDCHECK results.

    I have to see GROUNDCHECK results same like Nastran using Optistruct... i mean in G- set, N-set, F-set etc....

    <?xml version="1.0" encoding="UTF-8"?>nastran output.png

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

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

     

    Hi Rahul,

    No options are currently available in Optistruct to get the output in G- set, N-set, F-set for Groundcheck.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Thank you George and Rahul R for valuable information.

     

    Thanks & Regards,

    Rahul

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Hi Rahul,

     

    For another assembly when i run free-free modal analysis. It has given all PASS. But when i run the same model with SPCs, it gives FAIL. 

    Can u tell me how to overcome this issue and what is the reason of FAIL?

     

    Regards,

    Rahul

    <?xml version="1.0" encoding="UTF-8"?>ggg.JPG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Hi Rahul K,

     

    I think the answer is in your question. You get a fail because you are constraining the body and not allowing to move as a rigid. The same is reported back to you :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

     

    GROUNDCHECK: From help ' perform a grounding check analysis on the stiffness matrix to expose unintentional constraints by moving the model rigidly. '

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Okay Thank you Prakash :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

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