I am testing the sound pressure levels of a piezo transducer (using PZT-4 as piezo transducer) at different frequencies.
The one used is: https://www.steminc.com/PZT/en/piezoelectric-disc-25x85mm-s-235-khz
And, when simulating the sound pressure levels I get negative result above 142 kHz. The resonans frequency for this piezoelectric-disc is 235 kHz.
Does anybody know where I did something wrong?
Best regards, Kim