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About impedance measurement

Posted Jan 8, 2013, 9:37 a.m. EST Acoustics & Vibrations, Structural Mechanics Version 4.3a 2 Replies

Delwar Bhuyan
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Hello,
I am going to build up a model of Piezo and two others(pmma & Ti) materials (Frequency Domain Study) using Comsol 4.3a acoustics module. But I can't find out the impedance of piezo transducer. How is it possible to find the impedance of piezo? Can anybody give me some idea?


Thnx
Bhuyan
2 Replies Last Post Jun 7, 2013, 4:43 a.m. EDT
RVN
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Posted: 1 decade ago Jan 8, 2013, 10:57 a.m. EST
Hello!

You might get further using the acoustic-structure interaction option, I suggest that you take a look at the tutorial model found under Model Library ->Structural Mechanics module -> Acoustic-Structure interaction. There are some other piezo models available.

From there you might be able to experiment your way towards the impedance, I suspect it is a matter of post processing. You get some standard results like pressure and SPL from the acoustics module but you can find many other types of result like acceleration and Intensity, but not impedance explicitly. You can however find the impedance of an object by the relation that Z(w) = F(w)/v(w) where w is your angular frequency, F is force and v is the velocity. This however implies that you have a known (harmonic) force input somewhere.

If you are driving your piezo with an AC voltage you should see a mechanical vibration (harmonic force) output. This should also work the other way around i.e. if you have an harmonic force input to your device you should see a voltage developing over the electrodes of the piezo device.
Hello! You might get further using the acoustic-structure interaction option, I suggest that you take a look at the tutorial model found under Model Library ->Structural Mechanics module -> Acoustic-Structure interaction. There are some other piezo models available. From there you might be able to experiment your way towards the impedance, I suspect it is a matter of post processing. You get some standard results like pressure and SPL from the acoustics module but you can find many other types of result like acceleration and Intensity, but not impedance explicitly. You can however find the impedance of an object by the relation that Z(w) = F(w)/v(w) where w is your angular frequency, F is force and v is the velocity. This however implies that you have a known (harmonic) force input somewhere. If you are driving your piezo with an AC voltage you should see a mechanical vibration (harmonic force) output. This should also work the other way around i.e. if you have an harmonic force input to your device you should see a voltage developing over the electrodes of the piezo device.
Safia Lemlikchi
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Posted: 1 decade ago Jun 7, 2013, 4:43 a.m. EDT
Hi,

just have a look to model tutorial MEMs module > piezoelectric devices > composite transducer.

you can then change material and geometry depending on your case

Safia

Hi, just have a look to model tutorial MEMs module > piezoelectric devices > composite transducer. you can then change material and geometry depending on your case Safia

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