Tutorial 3: Multiphysics Modeling of Piezoelectric Transducer

[@madnan9268]

Your comsol playlist is amazing 🤩 thank you so much for such detailed tutorials on Comsol 👍. Have learned a-lot from these tutorials

[@Teacheetah]

Glad you like them! We will add more videos to this playlist

[@dadadadad-u9h]

Hello, I would like to ask, when the simulation, when set to 0s, also get the stress, what is the reason for this

[@sameerkumar-id6wo]

can u explain why have u taken these dimensions of piezo?

[@sametgoktas8186]

Will you show the converse piezo effect in another video? How can I model the converse piezoelectric effect ?

[@Teacheetah]

Thanks Samet for the comment. The modelling of the converse effect is very similar to the model proposed here. You may simply assign an Electric Potential boundary condition from the Electrostatics Interface to the piezo boundary (instead of the Floating Potential boundary condition used in this model) and then give a desired value or function to the Electric Potential (V) depending on your problem. Also remove the applied mechanical loads from the Solid Mechanics Interface and only keep the fixed boundaries and then solve the problem to find the resulting stress and strain due to the application of the electric potential.

[@michowdy6707]

Hi, do you know how to model a flexoelectric effect?

[@merouanesolo3852]

the electrodes are placed or glued on the piezoelectric layer ??

[@Teacheetah]

Thanks for the comment.The electrodes are modelled as boundary conditions (lines or edges) , for thin layer electrodes it is a simplified assumption. If the electrodes are thick, they can be modelled as separate domain geometries with defined materials and placed on the piezo layer, then by means of ‘form union’ they will share a boundary with the piezo

[@merouanesolo3852]

@@Teacheetah ah very well in the case of a thick electrode layer has it is just place on the piezoelectric layer or glue, by what I am studying the dynamic response of a rotating piezoelectric shaft and even the infulence of electric current on the natural frequency of the rotating shaft. and I want the electrodes to be placed on the shaft not to rotate with it

[@merouanesolo3852]

I want the electrodes to slide on the surface of the shaft

[@Teacheetah]

Thank for the comment. In many sensing and energy harvesting applications, the electrodes are ideally in a full attachment with the piezo-layer through a cured paste or coating which is also the case that modeled in this video. If you want to have your piezo to move independently from the electrodes, you may use different methods depending on the physics of your problem. Here are some suggestions that you may try: 1) you may define the electrodes and piezo as separate domains then change the location of the piezo using Parametric Sweep in your study to apply the rotation, 2) you may deselect or remove the electrodes from the Solid Mechanics Interface and only keep it in the Electrostatics Interface and then apply the mechanical load only to your piezo to make the rotation, 3) you may use Moving mesh-Rotating or Deforming Domains for your piezo under Definitions and also identify contact pairs between electrodes and piezo.

[@merouanesolo3852]

@@Teacheetah hello I want to know more about his techniques, you can recommend books or scientific articles

[@nandunsk4624]

Can we find the thermal characteristics of the piezoelectric transducer? how? pls reply

[@dody3329]

Sir could you tell me how should I add an electric circuit to a piezoelectric transducer in comsol to measure its output voltage ?

[@Teacheetah]

In the Electrostatics interface of your piezo model, you need to apply Terminal boundary condition to one of the piezo electrodes (e.g. the top one) and in the settings of the Terminal boundary condition, use the circuit option. Then, add Electric Circuits interface into your model from the Add Physics menu. In the Electric Circuits interface, use External I-Terminal and in the setting, use the Terminal that you have defined before. You can then add other electric circuit components (e.g. resistor, capacitor …) to the Electric Circuits interface and contact the nodes to its Terminal and Ground using proper nodes numbers.

[@maxwellconniff1189]

This should help kzbin.info/www/bejne/i3ano4R5eZmfpNk

[@dody3329]

@@Teacheetah Thank you sir

[@dody3329]

Sir can you tell me why am I not getting the option of piezoelectric devices in structural mechanics module both in 2d and 3d .I have downloaded comsol 5.6

[@Teacheetah]

You may try checking and ensuring if you have selected (check marked) all the related modules and interfaces to your physics when installing the software

[@dody3329]

@@Teacheetah ok, thanks a lot sir I got it

[@Teacheetah]

thanks for the comment. Glad you could figure it out.

[@hamid.s.zolfagari]

متشکرم. خیلی بدردم خورد

[@mehdimirghafari3945]

Hi I want to know how can I calculate the total power ? and how can be sure that simulation is correct?

[@Teacheetah]

Thanks for the comment. Please note that the example presented here is a basic case to introduce modeling of a mutli-physics problem in the software and the voltage signal presented here refers to an open-circuit condition. To calculate power, you may need to add the Electric Circuit interface into your model, link the piezo outputs to a desired external load based on your problem (e.g. a resistor R), and then you may find the power using V/R^2 or V*I where I is the current across your load resistance. In this case, note that the voltage and current signals are in the form of AC so you may need to integrate over one cycle or find the average values to calculate the total or average power, respectively. Regarding you model validation, one suggestion is to modify your model to be similar to existing experimental or theoretical models in the references and compare your results with them. Then, if you find a reasonable agreement in the results, you may go back to your original model and continue with that.

[@marcoaurelio8097]

Congratulations on the playlist! Could you make a tutorial with planetary gears and how to calculate the contact force between gears? Could you also make a tutorial of two magnets being attracted to each other due to magnetic force? Could you make a tutorial of a magnet aligning itself with the external magnetic field due to magnetic torque? Thank you very much!

[@Teacheetah]

Great suggestion! well consider them for our future videos on COMSOL

[@joydipnita]

Hi. First I would like to thank you for wonderful lecture session with comsole. Can you please make lecture series on LASER CLADDING using COMSOL MULTIPHYSICS...

[@madnan9268]

You’re amazing 🤩

[@Teacheetah]

Thanks for the comment

[@asdermanchannel6380]

Thanks for the good tutorial, I would like to ask, when will be the video where we can get this output into elecctric circuit, also if there are any references you could share in connecting circtuits?

[@Teacheetah]

Thank for the comment. The connection to external electric circuit can be done through adding Electric Circuits Interface into the model and properly setting up the boundary conditions. We suggest you to review the following article for more details: “Piezoelectric Energy Harvester ”, www.comsol.com/model/piezoelectric-energy-harvester-21421

[@jonahgvtan7921]

Could you explain more exercises of the ac dc module? Please

[@Teacheetah]

Thanks for the comments we are planning to add more videos to our comsol playlist, we will consider this comment for sure

[@ananthum3161]

How to model a piezoelectric transducer to generate power with acoustic energy as the input source

[@Parthasorenchess]

I'm not getting a sine curve please help

[@vmalenkupusamy1735]

if its a 3d model, where and how to check the output voltage

[@Teacheetah]

Thanks for the comment. In the 3D model, the electrode is a surface boundary rather than a line boundary so with the same analogy with the method shown in this video, you may use Surface Average instead of Line Average to find the output voltage of your target electrode.

[@vmalenkupusamy1735]

@@Teacheetah can I get your email

[@Teacheetah]

The email is [e-mail], but please comment your question as it might be useful for future viewers too.

[@vmalenkupusamy1735]

@@Teacheetah yes sir, i have mailed you

[@Teacheetah]

We will get back to you ASAP.

[@swatidevi234]

hlo sir, I watched your COMSOL tutorials, which are very informative. I'm trying to model piezoelectric with electrodes but facing some problems can you plz help me. Plz reply as soon as possible.

[@swatidevi234]

Kindly reply to me, sir.

[@nimishskoushik1587]

can you share the base paper which is related to this project ,thank you

[@Teacheetah]

Actually, it is a basic and hypothetical problem just for showing the concepts of combining multiple physics in one model and there is no paper associated with that.

[@umitylmaz90]

hi Sir, thank your for your video. could you make a video for amplified piezoelectric actuator for micro positioning stage applications. or can someone share some notes or video on finite element modeling of amplified piezoelectric actuator

[@fantomfantom4675]

very good

[@Teacheetah]

Thank you! Cheers!

[@MSaleem_11]

How To contact to you sir