Characteristics of the piezoelectric energy-harvesting from the torsional vibration of thin-walled cantilever beams

In this paper, based on the torsion theory of thin-walled bar (or beam), the static and dynamic theoretical torsion models are established and its static and dynamic characteristics and open voltage are analyzed for a piezoelectric energy-harvesting structure from torsional vibration. The results show that for this piezoelectric energy-harvesting structure with the thin-walled cantilever beam, the second modal frequency is 124.72Hz, the open circuit voltage can reach 1.82V when the excitation acceleration is 10m/s2. The torsion angle can reach 0.341° when the excitation acceleration is 3m/s2 with the second frequency.

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