Abstract: “The presented analysis concerns the two-degree-of-freedom lumped parameter model, which is combined of the magneto-piezoelectric energy harvester and the mass-spring subsystem used as a dynamic magnifier. The simplified single-degree-of-freedom energy harvester describes the tip beam dynamics and the voltage generated by the piezoelements. The equivalent mass and stiffness of the cantilevered beam, and also the piezoelectric properties characterize this subsystem. The repulsive force created by the tip magnet and another one mounted to the cantilever base is involved. It is assumed that the repulsive loading component is a nonlinear odd function of the cantilever tip displacement and the energy harvesting subsystem can be modelled as Duffing oscillator. Changing the distance between the magnets, monostable or bistable behaviour of the beam harvester can be created. The presence of bistability improves the harvester effectiveness and also may create chaotic behaviour. For characterizing”

Keywords: nonlinear energy harvester, bimorph piezoelectric beam, chaos