Simulating Chladni Figures with Modal Frequency Study?

[Anonymous]

Hey guys!

So, what I'd like to know/see, is whether or not it would be possible to simulate vibration in a solid (like a 200mmX200mmX1mm plate) to produce Chladni Figures to identify 2D nodes where the amplitude would be zero. 

I was thinking that maybe using the Modal Frequency study one could apply vibrations to the solid and observe the patterns that emerge with the colored heat map - but being very new to the simulation features and to this kind of physics in general, I was hoping some of you would know what kinds of constraints, loads and settings to apply.

And is there any way to force calculations of deformation for any given frequency?

Also, thank you for a great product and a very helpful community!

[John_Holtz]

Hi @Anonymous

Your thinking is correct. The Chladni figures are showing the results of the natural frequencies of the plates, so performing a Modal Frequency analysis will produce a similar image.

The problem with the simulation will be the thickness of the plates: 1 mm is very thin compared to the overall size, so it may not be possible to get an accurate answer using a solid. Ideally, you would create a surface instead of a solid in the model, and shell elements instead of solid elements in the simulation, but those features are not available yet in Fusion.

But give it a try, especially if you have a known situation that you can compare to the simulation results. You are going to apply fixed constraints in the same location of the model as the real plate is held. There are no loads in a modal analysis. It is calculating the shape and frequency, not how much the displacement would be (how loud it would be) if struck with a certain force or pulled a certain distance.