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Topology optimization of a crash bumper

Altair Forum User

Dear support and user,

I have set-up a crash bumper in optistruct for a topology optimization. In the first case a rigid wall is moving towards this bumper (fixed). Everything is working really fine, but now I want to make the rigid wall fixed and the bumper should move. Fixing the rigid wall is no problem, but my crash bumper is not moving. I tried it in the following way:

1.) 1D -> rigids -> RBE2 (mass point which substitutes the 'car')

2.) Analysis -> bodies (giving the RBE2 a mass etc.)

3.) Load Collector -> CARD = INVELB (giving the rigid body an initial velocity)

But in the simulation the crash bumper is not moving. What did I do wrong? Or what is the best way to do this?

Thank you for your help!

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Altair Forum User

Hi,

can you check if you have any constraints on it?

is it possible to share the model if still not working?

you can use the dropbox link in the signature to share the model.

Altair Forum User

Hi,

the rigid body has constraints, but not in x-direction (direction of the initial velocity). I did the set-up again, but unfortunately the new run didn't change anything.

I sent you the file via dropbox.

Thank you!

Altair Forum User

Thank you for sharing the model.

I dont see any bodies in this model. is this the model you are talking about?

Altair Forum User

Hi,

there should be one body called 'CAR' but no other.

Altair Forum User

Hi Prakash Pagadala,

which way would you recommend in general for setting up this optimization? Is my approach in principle right or did I miss something fundamental?