Model Reduction Methods

LOKESH KATARI
LOKESH KATARI Altair Community Member
edited October 2020 in Community Q&A

When we using model reduction methods for FE model when creating flexible body

Can we see that how much DOF it is decreased in hypermesh ?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018
    Altair Forum User said:

    Can we see that how much DOF it is decreased in hypermesh ?

    Hi @LOKESH KATARI Can you please explain what do you mean by DOF decreased?  

    Also, please use appropriate forum threads to post your questions so that it will be addressed soon. 

  • LOKESH KATARI
    LOKESH KATARI Altair Community Member
    edited October 2018

    ok sir from next time i will use appropriate forum

    DOF decreased means when we use the model reduction methods it will reduce the degrees of freedom from high to finite.

    For example chassis , whole vehicle

  • LOKESH KATARI
    LOKESH KATARI Altair Community Member
    edited October 2018

    like can we see for a model how much it is reduced?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018

    @LOKESH KATARI

     

    I don't think it is possible. 

  • LOKESH KATARI
    LOKESH KATARI Altair Community Member
    edited October 2018

    ok thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018

    @LOKESH KATARI

    DOFs are depended on element numbers/types.

    quad shell first order has 4 points and 6 dofs on every point=24 DOFs.

    If you create full vehicle model which contains 100.000 points (only shell elements and beams) you will have 6*100.000 DOFs

    if you separete chassis from full model and it will include only 50.000 points you can estimate your reduction coefficient=)

  • LOKESH KATARI
    LOKESH KATARI Altair Community Member
    edited November 2018

    Thank you so much Mrt

    one more doubt do we have any control card for model reduction in Optistruct

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018
    Altair Forum User said:

    do we have any control card for model reduction in Optistruct

    =) i think so if @Prakash Pagadala say that it wasn't possible you can't do it. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    Usually, total degrees of freedom will be written in the .out file. You can use remove the constrain dofs from the total... I guess this will help?

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