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Spring modelling in piezoelectric mode
Posted Jan 14, 2010, 9:19 a.m. EST 0 Replies
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To get more confidence in COMSOL I have modelled some very simple piecoelectric problems using COMSOL and up to now everything worked fine. Right now I was trying to model a small piezoelectric cylinder (PZT-2) where I have attached a spring.
An rough estimate for the change in length under load is given by equation (6) in www.physikinstrumente.com/en/products/prdetail.php?sortnr=400600.40.
dL=L0*(kt/(kt+ks)) where kt is spring contant of pieco and ks is spring constant of the load.
Without any load the displacement I get in Z direction is 43,4nm. Using ks=1000Pa and kt=890Pa (Figured out by measuring the displacement under constant force and calculating F/dL) I would expect 21,48nm. Using the simulation file attached I get approx 15,8nm.
I assume my modelling is not correct of the spring but some help from more advanced people could certainly point me into the right direction.
Thanks,
Christian
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Hello Christian Walter
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