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Piezoelectric material in Water Simulation

Posted Mar 16, 2015, 7:04 p.m. EDT Acoustics & Vibrations, Geometry, Mesh Version 4.4 6 Replies

Miao Meng
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Hi all,

I am trying to build a 3-D PZT 5H cube and put it in water and simulate it to get the impedance vs. frequency. I could build the PZT cube, but found trouble to put it in water.

I am adding a sphere around the PZT cube, but there is always a meshing problem I don't know how to solve.

Could anyone help me on this project?

Thanks in advance!

Miao
6 Replies Last Post Jun 12, 2015, 4:36 p.m. EDT
Edgar J. Kaiser Certified Consultant
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Posted: 10 years ago Mar 16, 2015, 7:28 p.m. EDT
Miao,

there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Miao, there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Miao Meng
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Posted: 10 years ago Mar 17, 2015, 11:30 a.m. EDT
Hi Edgar,

Thanks for your reply. I have attached my model.

Thank you very much in advance and please let me know if you have any questions.

Best,

Miao

Miao,

there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com


Hi Edgar, Thanks for your reply. I have attached my model. Thank you very much in advance and please let me know if you have any questions. Best, Miao [QUOTE] Miao, there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com [/QUOTE]

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Edgar J. Kaiser Certified Consultant
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Posted: 10 years ago Mar 18, 2015, 5:15 a.m. EDT
Hi Miao,

I meshed your model with default settings and didn't see any problem.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Miao, I meshed your model with default settings and didn't see any problem. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Miao Meng
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Posted: 10 years ago Mar 18, 2015, 10:14 a.m. EDT
Hi Edgar,

Could you explain briefly how you meshed the model? I am learning to use COMSOL

Thanks,

Miao
Hi Edgar, Could you explain briefly how you meshed the model? I am learning to use COMSOL Thanks, Miao
Edgar J. Kaiser Certified Consultant
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Posted: 10 years ago Mar 18, 2015, 10:39 a.m. EDT

Choose the Mesh tab in the menu bar and click Add Mesh. There are many options of course, but the default setting already generates a mesh. Now you can play with element sizes, shapes, structured mesh options, etc. Meshing is a wide field. You will have to invest some time in playing with the options.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Choose the Mesh tab in the menu bar and click Add Mesh. There are many options of course, but the default setting already generates a mesh. Now you can play with element sizes, shapes, structured mesh options, etc. Meshing is a wide field. You will have to invest some time in playing with the options. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Miao Meng
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Posted: 9 years ago Jun 12, 2015, 4:36 p.m. EDT
Hi Edgar,

I am able to get the impedance plot now, but if I put the PZT in air, I can get a clean and nice plot, but if I put PZT in water the impedance plots, both real and imaginary are very noisy. Do you have any ideas why this is happening?

I created a small PZT and put it into a larger block with water. Defined the top surface as terminal with voltage of 1V and bottom surface as ground. Gave the damping loss as 1/Qm=0.013 and dielectric loss of 0.02. ran the simulation and added a 1D plot group, then plotted the real impedance by expression as real(1/acpz.Y11) and the imaginary part as imag(1/acpz.Y11).

Do you see any problem with my method?

Thank you very much for your help.

Miao
Hi Edgar, I am able to get the impedance plot now, but if I put the PZT in air, I can get a clean and nice plot, but if I put PZT in water the impedance plots, both real and imaginary are very noisy. Do you have any ideas why this is happening? I created a small PZT and put it into a larger block with water. Defined the top surface as terminal with voltage of 1V and bottom surface as ground. Gave the damping loss as 1/Qm=0.013 and dielectric loss of 0.02. ran the simulation and added a 1D plot group, then plotted the real impedance by expression as real(1/acpz.Y11) and the imaginary part as imag(1/acpz.Y11). Do you see any problem with my method? Thank you very much for your help. Miao

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