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Applying material damping

Question asked by Doug Rawlings on May 24, 2012
Latest reply on Jun 19, 2012 by Brad S

Hello all,

 

I'm running a Linear Dynamic Harmonic Analysis modelling a vibration test rig I'm using.

 

The problem I'm having is that when I try to use Modal Damping based on Material Properties I get the same results, every time I run the test.

 

When I use Modal damping not based on 'Compute from material damping' with a value of 0.005 I get a result that is close (enough) to my experimental results.

 

But I want to be able to vary the damping for different parts.

 

So all the parts have custom materials assigned, with a value for Material Damping Ratio. But it seems that no matter what I set that to (and Update All Components) it makes no effect on the results, they look the same as when I ran with a global value of around 0.02.

 

I expect I'm doing something wrong but I can't work out what it is...

 

Thanks in advance for any help offered,

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