A dependent d.o.f.

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

Dear all,

 

I kept getting the error and can't figure out the problem. Can anyone help please... Thank you first.

 

Basically, my system is set as this. I would like to allow my model to rotate but constrained by other point.

image.png.fb35ecf53e454002767076ff93918d1d.png

*** ERROR # 176 ***
 A dependent d.o.f. of rigid elements is constrained in an SPC set.
        grid id = 1741329
      component = 5
     SPC set id = 45

************************************************************************

 A fatal error has been detected during input processing:

  *** ERROR # 176 ***
  A dependent d.o.f. of rigid elements is constrained in an SPC set.
         grid id = 1741329
       component = 5
      SPC set id = 45

 

 

 

Thanks,

Edison

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Answers

  • tinh
    tinh Altair Community Member
    edited June 2018

    Hi,

    the 2-end RBE2 must not be constrained at both ends, because one has been 'dependent' on the alternative

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Thank you, Tin,

     

    So how can I fulfill my goal to constrain the model? I would like to release the model one rotation DOE and constrain the rotation by the displacement of one the other node? like the figure below. Thank you!

     

    image.png.a8919a63eee727d0d2ceed562d22485a.png

     

     

    Thanks,

    Edison

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2018

    Hi @Edison

     

    You can either try with RBE3 or use zero-length spring elements to constraint and attach the same to RBE2.

      

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