AC current induced oscillations of electrothermal actuator driven by the Joule heating.

Hello everybody,

I'm trying to simulate a resonance mode oscillations of bimorph electrothermal actuator driven by Joule heating through AC current.

So far I've been trying to realize it through harmonic perturbation. So, I added a harmonic perturbation in addition to an applied electric potential. Then I did a Frequency- domain perturbation analysis in a range, which includes the resonance frequency of the actuator mechanical structure, in order to get a deflection sweep over a oscillation frequency. But it didn't work out at all...

Any help would be highly appreciated. I'm a sort of Comsol beginner, so I would be very grateful for the detailed answers if you could do that.

looking forward for your responces.

Thanks,
Olzhas