Dear Sara,

if i understand your question correctly, you want to attach a sinusoidal variation to the piezo device.

Declare a electrical circuit consisting of a voltage source and attach to a predefined node on the piezo device. Then perform simulation with a frequency sweep.

Dear Anuraag,

Thank you for fast reply. I am new in comsol.Can you explain how to apply voltage source to a predefined node on a piezoelectric device?

sure

In the Add physics tab, select AC/DC electrical circuit and then attach it to the required node. just try if you are not successful then let me know.

Dear Anuraag,

I want to give mechanical vibration to the piezo device. electrical circuit give a electrical oscilation to piezo device.

Please see the structural vibration module of the COMSOL. you can also evaluate mechanical eigen modes also.

under piezoelectric device physics mechanical vibration defined using prescribed displacement, prescribed acceleration,body load, boundary load, but I am not sure which one and how to provide A*sin(wt) vibration until displacement happen in -z to +z (sin) 

Sara,

1. As u have a piezo cantilever, you must constrain the one surface and apply  a condition in the structural boundary condition. In the electrostatics B.C you must ground the two ends. 

2. go to studies subsection and give preset studies> time dependent. This allows you to capture time phenomenon, here u have a Times tab , wherein you can give the range. some how emulate sin function.

                                                                OR

3. apply a boundary load (with amplitude versus frequency from an interpolation table or an equation) and a frequency domain solver, this will interpret ALL boundary loads as harmonic amplitudes, and define your frequency range() in the solver settings.

Thank you for your explanation. I applied boundary load to the surface.But how to apply sin function to the boundary?How to define the force in boundary load setting?

should I use moving mesh physic for mechanical vibration ?

i think as we are discussing here its better u send ur queries to me at rfbuzz@gmailcom, if possible i will show u online also through video chat or we discuss it online.

HI

i am trying to simulate piezo-acoustic interaction,

and my signal is ac which is V0sin(2*pi*f0*t) and secon is V0cos(2*pi*f0*t)

and im usin frequency domain, but when i am solvin there is problem appering, like undefined value "t",

can u help??

Hello,

I think the value "t" is not defined in frequency Domain. Just apply "V0" as Signal, which will be varying with the frequency f.

HI ALL IAM WORKING ON SURFACE ACOUSTIC WAVE SENSOR .I AM MODELLING IN COMSOL MULTIPHYSICS.Iam unable to get proper admittance versus frequency curve in the model.pls help me.iam new to comsol