Impact on membrane

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Hello, I'm working on a model of a membrane supported on its edges and subjected to loading at one point. I'm trying to obtain the frequency spectrum of my system but my model doesn't converge above a certain frequency. However, the same system but coupled to a fluid (fluid sphere + PML + Pressure Acoustic + Acoustic-Structure Coupling) worked correctly. I don't understand the source of the problem. I should point out that I used the the tutorial "Vibrating Membrane" of COMSOL to create the membrane structure.

Enclosed is my model, thank you very much for all your help! Anaïs


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