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Physics for a elastomeric vibration isolator.

Posted Mar 28, 2013, 7:02 a.m. EDT Acoustics & Vibrations, Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 4.3 4 Replies

Victor Soares
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Good morning.

I'm almost finished with my model.
The model consists in : 1 - Base. ( Base )
2 - Elastomeric Rubber. ( Borracha)
3 - Lid. (Tampa)
4 - Screw Hole.( Parafuso )

The Screw Hole receive the vibration then pushes down ( or up ) the lid. The lid then compresses the rubber part isolating the vibration.

I have so far modeled each part on it's own, including they're meshes. But when I put them on the same model , using ' Insert Sequence from File ' I can't get it to work .
I tried using 'Boundary Conditions' such as - Fixed Constraint; - Rigid Connector ; Boundary Load ; Etc...
What I'm trying to make it work first is that when the Screw Hole goes up and down , it will make the Rubber move as well. But sometimes the Rubber part is deformed INSIDE the Screw Hole.

I'd like to ask for some help here so I can make my model work properly .

Thank you very much .


Victor Soares
4 Replies Last Post Apr 3, 2013, 10:32 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 28, 2013, 4:38 p.m. EDT
Hi

you need to insert them as geometrical objects (first export each as mphbin) and then "move" them into place so you get one model with all 4 parts, correctly in place (exactly overlapping boundaries. You have done great job there as these parts are rather complex w.r.t. use of the limited COMSOL CAM application.

Once you have them all in one model, you can combine the materials, physics and set up your BC and mesh, and solve

--
Good luck
Ivar
Hi you need to insert them as geometrical objects (first export each as mphbin) and then "move" them into place so you get one model with all 4 parts, correctly in place (exactly overlapping boundaries. You have done great job there as these parts are rather complex w.r.t. use of the limited COMSOL CAM application. Once you have them all in one model, you can combine the materials, physics and set up your BC and mesh, and solve -- Good luck Ivar
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Mar 30, 2013, 11:46 p.m. EDT
Hi Victor,

You have to connect the 4 parts to each other appropriately. There are several ways to do that. You can use the union geometry operator (instead of Assembly), or setup identify or contact pairs.

Nagi Elabbasi
Veryst Engineering
Hi Victor, You have to connect the 4 parts to each other appropriately. There are several ways to do that. You can use the union geometry operator (instead of Assembly), or setup identify or contact pairs. Nagi Elabbasi Veryst Engineering
Victor Soares
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Posted: 1 decade ago Apr 1, 2013, 7:45 a.m. EDT
Thank you guys very much !

I'll be trying this new methods you told me.


=)
Thank you guys very much ! I'll be trying this new methods you told me. =)
Victor Soares
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Posted: 1 decade ago Apr 3, 2013, 10:32 a.m. EDT
I'm trying first with the Screw+Rubber+Lid.
This is what I've got so far. The Rubber+Screw and Lid+Scew contact seems to be right, but the Rubber+Lid interaction is wrong. The lid is not pushing/pulling the rubber. Instead it's going trough it.

Any hints ?
I'm trying first with the Screw+Rubber+Lid. This is what I've got so far. The Rubber+Screw and Lid+Scew contact seems to be right, but the Rubber+Lid interaction is wrong. The lid is not pushing/pulling the rubber. Instead it's going trough it. Any hints ?

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