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Using bending moment to simulate piezoelectric actuator applying on a simply support plate. 3 order larger results?
Posted 30 mar 2011, 06:40 GMT-4 Structural Mechanics Version 4.1 0 Replies
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I’m using four line moments to simulate a square pzt-5A patch on a simply supported rectangular plate because of my pzt patches are relatively too thin(only 0.267mm).
The moment are derived as M=-Epd31Vbph on the four edges.
Ep is young’s modulus of PZT. 5.2 x 1010 Newton/meter2
d31 is Piezoelectric Strain Coefficient. -190 x 10-12 meter/Volt
V is applied voltage. 5V
bp is the length of the pzt patch. 72.4mm
h is half thickness of the simply supported plate. 2.9mm
I use solid physics for the plate, shell physics for the pzt. Then assign four moments along the pzt patch edges (by adding edge load=>M). Here I use “edge load defines as moment per unit length “, then set the M=-5.2 x 1010 x -190 x 10-12x5x0.0724x0.0029/0.0724 (moment per unit length, the length of pzt patch is 0.0724 meter). Then use frequency domain study to analyze the response of the plate.
All the resonant peaks seem close to my experiment data, however the acceleration amplitude or the other physics results are larger around hundreds to thousands to the experimental measurement.
I think there should be something wrong in my setting, not just for the difference between the practical condition and the model setting (thousands larger might be too much ? )
Don’t know where could be the problem; I already check every parameter very carefully. I would be very appreciating if anyone gives suggestions.
Thank you.
Best regards,
JenHsuan
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Hello Jen-Hsuan Ho
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