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piezoelectric
Posted Jul 21, 2012, 1:00 a.m. EDT Version 4.0a 2 Replies
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sir,
I'm able to get voltage as output when force is applied.But i'm unable to get charge,power etc.give me some tips
I'm able to get voltage as output when force is applied.But i'm unable to get charge,power etc.give me some tips
2 Replies Last Post Jul 23, 2012, 1:13 a.m. EDT
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Posted:
1 decade ago
Hi
charge you can estimate from voltage and capacitance, but as for power there is a d/dt component missing. Applying a force in stationary does not give any power it's time independent. and the poser depends on the load impedance. You need to define your model fully, i.e. with a CIR and then input some PSD or time varying / harmonic developpment values.
Sketc it out on a piece of paper before you try to set up the COMSOl model as it will depend on how you decide to masure power, viltage, current, charge ... or whatever. This is true multiphysics ;)
--
Good luck
Ivar
charge you can estimate from voltage and capacitance, but as for power there is a d/dt component missing. Applying a force in stationary does not give any power it's time independent. and the poser depends on the load impedance. You need to define your model fully, i.e. with a CIR and then input some PSD or time varying / harmonic developpment values.
Sketc it out on a piece of paper before you try to set up the COMSOl model as it will depend on how you decide to masure power, viltage, current, charge ... or whatever. This is true multiphysics ;)
--
Good luck
Ivar
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Posted:
1 decade ago
Hi,
In order to obtain charge, you have to couple piezoelectric device physics with CIR. Add capacitance and then plot charge. If you do not do this, you will always get zero charge while you will still get some terminal voltage.
I think power can be plotted directly. Look at the post-processing options. I am sure that Comsol has total power and some gradient of power loss which you can integrate to get full power loss.
-Sankha
In order to obtain charge, you have to couple piezoelectric device physics with CIR. Add capacitance and then plot charge. If you do not do this, you will always get zero charge while you will still get some terminal voltage.
I think power can be plotted directly. Look at the post-processing options. I am sure that Comsol has total power and some gradient of power loss which you can integrate to get full power loss.
-Sankha