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rigid connector

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Dear colleagues,

I need to constrain the center of rotation of a rigid connector with a spring.
Is there the possibility to do that?

It might be easy to do if I could use an existing point as the center of rotation, but I do not know how to do it.

Thanks for any suggestions

Simone

1 Reply Last Post 5 déc. 2013, 14:56 UTC−5
Henrik Sönnerlind COMSOL Employee

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Posted: 1 decade ago 5 déc. 2013, 14:56 UTC−5
Hi,

Here is a way to do it for a simple linear spring:

1. Figure out the name of the rigid connector degree of freedom you are interested in, e.g solid.rig1.v for a y-displacement in the rigid connector with tag 'rig1'
2. Show Advanced Physics Options
3. Add Solid Mechanics->Global->Weak Contribution
4 Enter the contribution as " -k*solid.rig1.v*test(solid.rig1.v)" where k is the spring constant.

This can fairly easy be extended to a spring which changes direction with deformation etc.

Here is another quicker variant, with a little less generality:
1. Add an Applied force to the rigid connector
2. In the y-component of the force, write "-k*solid.rig1.v"

Regards,
Henrik
Hi, Here is a way to do it for a simple linear spring: 1. Figure out the name of the rigid connector degree of freedom you are interested in, e.g solid.rig1.v for a y-displacement in the rigid connector with tag 'rig1' 2. Show Advanced Physics Options 3. Add Solid Mechanics->Global->Weak Contribution 4 Enter the contribution as " -k*solid.rig1.v*test(solid.rig1.v)" where k is the spring constant. This can fairly easy be extended to a spring which changes direction with deformation etc. Here is another quicker variant, with a little less generality: 1. Add an Applied force to the rigid connector 2. In the y-component of the force, write "-k*solid.rig1.v" Regards, Henrik

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