Artefacts In Total Radiated Power Spectrum Of A Piezoelectric Transducer

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Hello everyone!

I have the following question/problem:

I am currently modelling a piezoelectric transducer based on the COMSOL example "Piezoelectric Tonpilz Transducer with a Prestressed Bolt". I have made some modifications to the geometry and material, but the overall concept is still the same.

I have noticed that after making some geometric changes, artefacts/spikes appear in the Total Radiated Power Spectrum (see figures). Has anyone observed similar behavior, or can anyone explain what might be causing this?

Thanks!

Best, Ronja



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