Time Simulation of QCM

Hi Everyone,

In this moment, I'm working with a QCM model created by COMSOL that you can see in this link: www.comsol.com/model/thickness...ar-mode-quartz-oscillator-4707
At moment, I'm trying to create a time simulation to compare the mechanical displacement with the time and voltage in electrodes, but when de simulation is finished, the graph shows that the mechanical displacement frequency and voltage signal frequency are diferent. I don't understand that !!

I attach several graphs of two signals

Thanks for the help

Regards

Luis