Sine sweep excitation in direct transient

Yuri S.
Yuri S. Altair Community Member
edited April 2021 in Community Q&A

Hi, 

Does anybody know if it is possible to enforce a sweep (chirp) excitation for a nonlinear transient analysis?

Thanks,
Yuri

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Best Answer

  • Adriano A. Koga
    Adriano A. Koga
    Altair Employee
    edited April 2021 Answer ✓
    Yuri S. said:

    Hi sir,
    Thank you for the answer. 
    Yes, this seems to be a quite time consuming procedure.

    Isn't there a way to express a forcing term through a table? (One in which functions can be expressed).
    I know there is something similar in other softwares (eg MARC). 

    Hi @Yuri S. 

     

    The only way i'm aware of is to define these as tables/curves, explicitly defined.

    But you can easily create then into Compose or Excel, generate a CSV/TXT file an import to HM as a table (Utiliy>>Table Create).

    In HW2021, just create a curve, and copy and paste from Excel to your curve editor.

Answers

  • Adriano A. Koga
    Adriano A. Koga
    Altair Employee
    edited April 2021

    as far as I know, you would need to apply this as an explicit curve (TABLED1) entity, and associate it to your TLOAD1 card.

    BUT, for a NL Transient card this would probably be very time consuming.

  • Yuri S.
    Yuri S. Altair Community Member
    edited April 2021

    Hi sir,
    Thank you for the answer. 
    Yes, this seems to be a quite time consuming procedure.

    Isn't there a way to express a forcing term through a table? (One in which functions can be expressed).
    I know there is something similar in other softwares (eg MARC). 

  • Adriano A. Koga
    Adriano A. Koga
    Altair Employee
    edited April 2021 Answer ✓
    Yuri S. said:

    Hi sir,
    Thank you for the answer. 
    Yes, this seems to be a quite time consuming procedure.

    Isn't there a way to express a forcing term through a table? (One in which functions can be expressed).
    I know there is something similar in other softwares (eg MARC). 

    Hi @Yuri S. 

     

    The only way i'm aware of is to define these as tables/curves, explicitly defined.

    But you can easily create then into Compose or Excel, generate a CSV/TXT file an import to HM as a table (Utiliy>>Table Create).

    In HW2021, just create a curve, and copy and paste from Excel to your curve editor.

  • Yuri S.
    Yuri S. Altair Community Member
    edited April 2021
    Adriano A. Koga_21884 said:

    Hi @Yuri S. 

     

    The only way i'm aware of is to define these as tables/curves, explicitly defined.

    But you can easily create then into Compose or Excel, generate a CSV/TXT file an import to HM as a table (Utiliy>>Table Create).

    In HW2021, just create a curve, and copy and paste from Excel to your curve editor.

    I missed out this valuable piece of information! 

    Thank you very much.
    Yuri

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