I would like to simulate a piezoelectric harvester (figure 1) and perform a transient analysis in a bimorph piezoelectric beam. I know how to define piezoelectric material, but I'm having some problems with the boundary conditions. I coupled and connected the top and bottom VOLT DOF to the resistor and also ground the middle DOFs (figure 2). I tried to apply a harmonic base excitation (displacement or acceleration) at X=0 (figure 2) using the 'D' command and perform a 'FULL' transient solution, but the results for the voltage at one of the resistor nodes (figure) seems incorrect. Any help with what may be wrong or example on how to apply the base excitation would be highly appreciated. Thanks!