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LoHo

Kinematic Constraints

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Hello everyone,


 


i need to set up a dynamic FEM Simulation in RADIOSS with several bodies. It's a mix of rigid and FE bodies. For jointing them, i want to use kinematic constraints but for me it's hard to find out how these kinematic constraints are set up correctly.


Is there a tutorial how to set up kinematic constraints in HyperMesh (with RADIOSS)? I'm also very glad for some advices.


 


Thanks.


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Hi Prakash Pagadala,


 


thanks for answering so fast. My Question aim more for kinematic joints to connect several bodies. Therefore i can't find any tutorial or example or even some advices


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Guest

Hi LoHo,


 


What type of joint are you trying to model?


 


Maybe you should look at PROP/KJOINT (prop/type33) in RADIOSS.


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Hi Prakash Pagadala,


 


i've tried already these PROP/KJOINT (type33). This is exactly what i meant. I need to know how these prop work correctly and how they are defined.


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LoHo,


 


Say I need a translational joint,


 


define a spring to represent translational joint with type 33 property. It needs 2 skews to be defined for end A and end B of the spring element.


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Ok:


1. Create SPRING2N


2. Create /PROP/KJOINT type33 and select the desired type of joint


3. Relate SPRING2N to FE-Mesh or rigids


4. Create SKEWs for each point of the SPRING2N


5. Define /PROP/KJOINT with the SKEWs


6. Assign /PROP/KJOINT to SPRING2N


 


I'll try this and send a reply. Thanks, Prakash Pagadala.


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Hi Prakash,


thank you for the advise. I already looked at the Cylindrical joint in the radioss help, but this is not exactly what I want. I need only a rotation around one axis in space. The cylindrical joint has in addition a translational dof along one axis. So the CJ is not useful for me.


 


F.M.


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Guest

Hi Ivan,

I recommend you to define using /PROP/TYPE45 spring joint, which describes the joint type spring between two rigid bodies.

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