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Simulated results of the piezoelectric device by using COMSOL multiphysics: (a) Mesh used in the simulation; (b) 3D FEM simulation of the stress distribution in the cantilever beam and (c) top view of the structure with the trapezoidal beam shape detailed (arbitrary units); (d) maximum open-circuit voltage that can be generated by the piezoelectric generator submitted to a frequency sweep, at different values of the input acceleration ranging from 0.05 G to 0.20 G.
