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[solved] damped oscillations in a piezoelectric cantilever

Posted Oct 6, 2010, 11:55 a.m. EDT 4 Replies

Andrea Mazzalai
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4 Replies Last Post Oct 14, 2010, 12:32 p.m. EDT
Alex Schenk
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Posted: 1 decade ago Oct 8, 2010, 6:44 a.m. EDT
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 Oct 12, 2010, 11:15 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 13, 2010, 1:44 a.m. EDT
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 Oct 14, 2010, 12:32 p.m. EDT
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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