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Thanks Jvian. My modes look normal. The first one is around 1000Hz. The part has a mounting flange with bolt holes. I've constrained the bolt holes in all translational and rotational DOF. There is no load on the part. I entered a freq vs acceleration freq input for the DynFreq analysis...

Hi all, I've run a modal analysis and then a dynamic freq analysis. I created a displacement measure. When I view the results, the displacement at zero Hz (0.21 Hz to be exact) is very high (~.25"). That does not seem at all right. I've attached a screenshot of my graph. Does anyone...

How should I modify my model to match test data results? I've completed a modal analysis and dynamic frequency analysis of an assy. I have graphs plotting frequency vs acceleration at specific points. I also have vibe test data from a sine sweep test. My Mechanica results are close, but...

Thanks for the answers Steve. I've got one more question guys. If I use the above approach, can I compare the results to test data from a sine sweep? Here's why I ask: on a shaker table, the energy is applied to the part by the table and up through the mounting structure on the part. Is...

Wow Steve, thanks. Those videos were incredibly helpful. Got me a long ways farther. Thanks. I've got a couple follow-on questions if that's okay: (1) freq direction/vector: in the video you took the transform from one csys to another because you wanted the force applied in a direction that...

Great suggestion on Steinberg- I've got the book... and have used his approach for fatigue predictions. In the past, someone else was telling me the Fn, now I'm doing some of the structural FEA. So I still want to run a sine sweep, identify the resonance frequencies and the acceleration at...

I'm doing vibe. And yep, I understand (1) the fixture Fn shouldn't be close to the UUT Fn and (2)the fixture Fn should be outside of a random vibe freq range. So when I characterize the fixture I should know: where the resonant frequencies are and also amplification at each resonance, right...

Thanks Twoballcane. Will a modal analysis tell me the response at each resonant freq? How do I know what the response is compared to the input?

How do I simulate a sine sweep in Mechanica? I'm trying to identify resonant frequencies in a test fixture and the acceleration at each freq. I've set up a Dynamic Freq analysis. I've created an acceleration measure. How should define the input? How do I interpret results? Thanks!

I'm using shells. I'm on WF4. Should I define end welds or use Pro's Automatic Midsurface Connections? I'm running an analysis on an assembly. Each component has shell pairs. I didn't define any end welds (there are a lot of surfaces) yet. When I look at analysis results, the stress...