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I am posting here as a last resort, so any guidance/references would be much appreciated.

As a small part of my project, I need to calculate the natural frequency of metallic solid spheres. All I have been able to find on the web is the Schummann Resonance, which may or may not be very accurate in my case. I've also read somewhere that it can only be solvable through the application of FEM models with 2nd order differential equation boundary conditions.

ANY input is much appreciated.

Thank you