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FREE-FREE Modes

Hello

I have a model that I am checking for any errors. I ran a free-free modal analysis. Instead of getting 6 rigid body modes (zero), I am getting the first 3 modes as 0 while, the other 3 (rotational) are not perfectly zero. It has a value of 0.2

Any recommendation on how to debug and know what is going on?

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0 shaheer.iqbal over 7 years ago
Hello,

Thank you for the response, So I debugged my model and found the following fix.

I was using glued contact within my model. I deleted the glued contact and put a RBE2 contact to attach the bodies and it fixed the error.

Any suggestion why would a glued contact not give perfect rigid body modes?
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0 shaheer.iqbal over 7 years ago
Hello,

Thank you for the response, So I debugged my model and found the following fix.

I was using glued contact within my model. I deleted the glued contact and put a RBE2 contact to attach the bodies and it fixed the error.

Any suggestion why would a glued contact not give perfect rigid body modes?
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