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electrostatic actuated resonator

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Hi,
i m trying to design a resonator. A Cantilever model, with elastic material as a Gnd in the middle and two electrodes (top and Bottom electrodes) as a terminal. A voltage will be applied simultaneously on the two terminals, in order to create an up and down displacement.
What i ve done is, I separate the two terminals, i give a sin function for the top-electrode n the inverse function for the bottom-electorde. What i m trying to do is, by multiply both sin funktions to V1 to get V0 and using V1 as a sweep parameter, i would like to plot the displacement vs Voltage V0....
But its still not working!
Any idea how i can solve this problem?
Thank you
Tatek


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