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,