Abstract
This paper proposes a reversible nonlinear energy harvester to realize broadband vibration energy harvesting. Especially, the softening and hardening nonlinear responses of an M-shaped piezoelectric beam could occur by tuning the clamping distance or titling angle, which is unlike previous efforts to institute nonlinearity. The proposed M-shaped beam consists of a pre-bent steel beam, a piezoelectric patch, and a proof mass without magnetic components. According to the numerical and experimental results, the proposed harvester could achieve a broader operation bandwidth than its linear counterpart. Under the low forward sweep excitation level (3 m/s2), the proposed reversible nonlinear energy harvester can cover the wide low-frequency range of 13.4–27.6 Hz (or 18.1–28.8 Hz) by changing the clamping distance (or the tilting angle). Exploiting this tunable nonlinear phenomenon makes it more suitable to harvest energy from broadband vibration efficiently.
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