How to calculate power output in piezoelectric material?

[kev139]

Hi,

I want to use piezoelectric material to harvest compression energy, i need to calculate the power output but i can't find enough information on the web to figure it out...

First, I want to learn how to calculate the power output of piezoelectric material using d33 and g33 data.

Second, what kind of piezoelectric material should i buy to get the most power at low frequency under a stress of 0,5 kN for the price.

Third, how piezo cable perform vs ceramics, because it would be a lot easier to install them in my device.

Thank you all for your responses!

 

[Barloud]

Hi,

The most important parameter for energy generation with a piezoelectric material is its electromechanical coupling factor, in your case k33. Its mechanical quality factor is also important. PZT is the most common piezoelectric material and may be a good start, depending on your application.

But that's not the only thing: if your mechanical input is a force, you should also design a structure that resonates at the same frequency than that of the force. You mention "low frequencies" in your post. Which range are you talking about?

 

[russ_watters]

Force isn't energy: you need to know the displacement to calculate available input energy.