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Is your .fil file in the same directory as the input file? Or do you have the .fil file open with another program?

Can you attach or post the step-definition part of your input file? (i.e. all the interactions, surface definitions, interaction definitions, etc). That might help us identify the problem. Dave

1 mass, 2 springs, 1 dashpot... that's 4 passive components.

Fantastic, thanks! I wrote a quick-check in Excel, and the math works out. Is this the response you'd expect for a square wave input close to the resonant frequency? Thanks again, Davehttp://files.engineering.com/getfile.aspx?folder=35902755-de9e-43bb-9acf-ce15422a49c2&file=pi_filter.xls

It looks like I was incorrect in calling it a Butterworth filter. It looks like this is a pi filter.

I'm a little rusty on my circuit analysis, so I was hoping someone more well-versed in circuit analysis could give me a little help in figuring out a filter I'm interested in. I believe it is a Butterworth filter. I'm a mechanical engineer, and it'd be easier to set up the differential...

I've done a parametric study of crippling of a plate simply supported on 3 edges with 1 free edge (the free edge is not a loaded edge), just like a typical flange. I've compared the results to a classical hand calc. The problem is that my FEM predictions (linear eigenvalue, Abaqus 6.7) are...