A new cantilevered piezoelectric energy harvester (PEH) of which the additional lumped mass is connected to a
harmonically oscillating base through an elastic foundation is proposed for maximizing generated power and enlarging
its frequency bandwidth. The base motion is assumed to provide a given acceleration level. Earlier, a similar energy
harvester employing the concept of the dynamic vibration absorber was developed but the mechanism of the present
energy harvester is new because it incorporates a mass-spring system in addition to a conventional cantilevered
piezoelectric energy harvesting beam with or without a tip mass. Consequently, the proposed energy harvester actually
forms a two-degree-of-freedom system. It will be theoretically shown that the output power can be indeed substantially
improved if the fundamental resonant frequencies of each of the two systems in the proposed energy harvester are
simultaneously tuned as closely as possible to the input excitation frequency and also if the mass ratio of a piezoelectric energy harvesting beam to the lumped mass is adjusted below a certain value. The performance of the proposed energy harvester is checked by numerical simulation.
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