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Spring modelling in piezoelectric mode
Posted 2010年1月14日 GMT+1 15:190 Replies
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Dear COMSOL Users,
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
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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Last Post 2010年1月14日 GMT+1 15:19
Hello Christian Walter
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