Abstract
This paper presents a T-shaped piezoelectric energy harvester (TPEH) by utilizing multimodal techniques. The proposed TPEH is consisted of a clamped-clamped beam and a branched cantilever beam at the center. One end of the clamped-clamped beam could move freely along the axial direction and a piezoelectric wafer is glued at the end. Two operational bandwidths are shown in the experimental results. Moreover, various cantilever beam configurations were investigated. It was found that the first resonance band moves to the low frequency range as the tip mass of the cantilever beam increases. However, the second resonance band accesses to lower frequency range slightly. Finally, it was demonstrated that the presented TPEH can be used in low frequency and low amplitude vibration environment.
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