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A dependent d.o.f.

Altair Forum User

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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tinh

Hi,

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

Altair Forum User

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

Hi @Edison

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