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I cant find it myself so I´ll have to ask, where did you get the 1.4mA from?

Seems to me that you've not presented a sufficiently enough detailed operational scenario and requirements to even begin to figure out what you need to do. At my first try Im going with a Ni-Mh battery since it doesnt need extra circuitry to allow charging. The electronics are not going to be...

I´d like to try this approach, but Im a bit confused with the details. The response curve you are talking about, is it available to get from some piezo institutes or do I need to order a piezoelectric kit and measure the curve myself? For the PSD: do I get the equation of integration interest...

The problem is that most piezoelements only harvests energy within a specified frequency, and the power output decreases heavily outside that spectrum. So I think that integrating the curve would give me false hopes of power output.. I´m currently halfway through the book "Energy Harvesting...

Yes, and my task is to evaluate the implementation possibilities within an application with a small rechargeable battery, with the task to power some LEDs from time to time. Models for power output has been developed and there are a bunch to try out, which is my plan before I´ll give myself into...

Do you mean a physical transfer function, or an equation? I have a few articles available with equations for calculating the piezoelectric power with dependence of the vibrations from the source. That´s the reason Im doing this, I can´t order any piezoelectric devices if I don´t have anything...

IRstuff: I do want to determine the power I could achieve from a PZT, bi- or unimorph plates mounted within a vechicle. With the hopes of harvesting the energy from ambient vibrations. Actually the amplitude would probably have been a issue after I managed to get my head around the frequency...

Ok, now Im completely lost :/ The only data I have is the acceleration graph and the PSD for it. They have been measured by someone else, and was given to me since Im doing studies that require an operating frequency. I need to pinpoint a frequency from which I could harvest the most energy...

IRstuff, Im a bit lost in my calculations of piezoelectricity. But hopefully Im a bit more educated within the area now :) What Im looking for in terms of frequency is the bandwidth where the most of the frequency is. Since I need to order piezoelements that work in that specific frequency...

Thank you for your help, and sorry for the late answer - everyone needs vacation :) The plot is from a test vehicle, and I need the frequency to complete some calculations within piezoelectrics.

A resonate frequency would be perfect, if the psd provides the information needed :)

Thanks for your reply Greg. You just saved me a whole bunch of time :)

Hi! I´ve tried to analyze the plot attached for a while now, but it does´nt make any sense to me. I´ve never encountered a PSD plot before and I need a frequency (mean) to continue my calculation on vibrations, but the PSD just makes me confused. Could anyone extract some information from it to...