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Electrical impedance of a piezoelectric material
Posted 13 giu 2018, 08:36 GMT-4 0 Replies
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Hi, My model consists simply of the harmonic analysis of a ceramic material with an imposed potential (inverse effect). I wonder how to build the electrical impedance graph, amplitude and phase. To calculate the current, there are as far as I know two ways : - by integrating on the material surface the quantity "i w pzd.nD" with "pzd.nD" the surface charge. - by integrating on the material surface the current density "pzd.Jx" (the piezoelectric material is x oriented). Those two expressions give me different results which is my first inquiry. Also, the two results are purely imaginary, the real part is null for all frequencies. This last point means that the potential and the current have always an offset of +-pi/2. The measurement shows smoother transitions at the resonance and anti-resonance. Is there anyone who encounters those problems ? Many thanks, Nicolas
Hello Nicolas Papaxanthos
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