🎉Community Raffle - Win $25

An exclusive raffle opportunity for active members like you! Complete your profile, answer questions and get your first accepted badge to enter the raffle.

Join and Win

Relaxing DOFs

Altair Forum User

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?

Find more posts tagged with

English

OptiStruct

Accepted answers

All comments

tinh

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?

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

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

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