Relaxing DOFs

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

I have a problem regarding the modelling of a ball joint. I would like to relax the three rotations of a node shared by two beam elements but couldn't find out how.

 

If I try to use the command 'joint' then I have to solve the simulation as a multibody dynamic problem and that looks more complicated as I need to set up more control cards like MBSIM and set up other options which I do not understand.

 

What's the best strategy to solve my problem?

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Answers

  • tinh
    tinh Altair Community Member
    edited August 2015

    I have a problem regarding the modelling of a ball joint. I would like to relax the three rotations of a node shared by two beam elements but couldn't find out how.

     

    If I try to use the command 'joint' then I have to solve the simulation as a multibody dynamic problem and that looks more complicated as I need to set up more control cards like MBSIM and set up other options which I do not understand.

     

    What's the best strategy to solve my problem?

     

    Hi

    two beams connect together with full 6 dofs

    if you want to release some dofs, just update 'pin flag'

    enter panel 1d>bar>update to do this

     

    and be careful that these 'pin flag' dofs are in beam coordinate system, not basic system

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2019

     

     

     

    Hi

     

    two beams connect together with full 6 dofs

     

    if you want to release some dofs, just update 'pin flag'

     

    enter panel 1d>bar>update to do this

     

     

     

    and be careful that these 'pin flag' dofs are in beam coordinate system, not basic system

    Hi tinh, can I use the same procedure in radioss ??

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited January 2019

    Multibody Dynamics Simulation is only available with OptiStruct.So Radioss will not work here.

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