Driving assembly of Pressure Acoustics and Solid Mechanics at eigenfrequency to get total stored energy

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I have built a simple assembly of a stainless steel can filled with superfluid helium. I started with an eigenfrequency study to find the breathing and sloshing modes of the system (first sloshing mode n=1 @ 939 Hz, first breathing mode n=2 @ 1875 Hz). I calculated the total potential energy and kinetic energy by doing a volume integral over each medium, but I'm not sure if I trust that the total stored energy is equal to the time averaged kinetic plus potential energies. So, I am trying to be able to observed the behaviour of the system being "driven" at it's eigenfrequency over time, to be able to calculate the total energy as the maximum kinetic energy when the potential energy is zero, or vice versa. This example www.comsol.com/model/vibration-analysis-of-a-deep-beam-20301 seems pretty similar, in terms of finding the periodic displacement of a point, but I am unsure how to implement this when using Pressure Acoustics and Solid Mechanics coupled by Acoustic-Structure Boundary Multiphysics. Do you have any suggestions? Do you require any clarifications on my question?



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