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[solved] damped oscillations in a piezoelectric cantilever

Posted 6 ott 2010, 11:55 GMT-4 4 Replies

Andrea Mazzalai
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4 Replies Last Post 14 ott 2010, 12:32 GMT-4
Alex Schenk
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Posted: 1 decade ago 8 ott 2010, 06:44 GMT-4
I can't look at your model because I dont have COMSOL on this computer, but wouldnt the damping effect be due to the fact that your cantilever is made of two different materials, each of which will respond differently to the oscillation?
I can't look at your model because I dont have COMSOL on this computer, but wouldnt the damping effect be due to the fact that your cantilever is made of two different materials, each of which will respond differently to the oscillation?
Andrea Mazzalai
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Posted: 1 decade ago 12 ott 2010, 11:15 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 13 ott 2010, 01:44 GMT-4
Hi

depending on how you connect up electrically your PZT you could have damping, there might be some "numerical damping" I believe for stability reasons, check the doc

--
Good luck
Ivar
Hi depending on how you connect up electrically your PZT you could have damping, there might be some "numerical damping" I believe for stability reasons, check the doc -- Good luck Ivar
Andrea Mazzalai
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Posted: 1 decade ago 14 ott 2010, 12:32 GMT-4
Good evening,

I found the problem. It was due to a too large time stepping in the transient analysis settings.

With 1/100 of the period as time step everything works fine.
Good evening, I found the problem. It was due to a too large time stepping in the transient analysis settings. With 1/100 of the period as time step everything works fine.

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