Modulated sinusoidal excitation

Hi everybody,

I have to simulate a piezo transducer. The excitation of ceramics is a modulated sinusoidal excitation with an amplitude of 110V. In Piezdoelectric Devices module, I just can set a electric potential V0.

In definitions, I can create a sinusoidale function (without modulation), but I don't know if I should use it. I'm in frequency domain, and I would know how the frequency is used in the calculation.

Thanks for your help,
Quentin