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Multi-resonant energy harvester: (a) schematic, (b) simplified mechanical model, (c) expected output characteristics.
Multi-mode resonant frequencies of the energy harvester as a function of the flexible body beam spring constant, obtained by FEM simulation.
Photographs of (a) our fabricated energy harvester and (b) a conventional cantilever-type energy harvester.
Measured frequency response of our energy harvesters; insets are the relative displacements at resonance from FEM simulations: (a) the conventional cantilever device has a single voltage peak (dash line, 7.5 V/g at 35.8 Hz), whereas our device (body beam of L = 6 cm) has two voltage peaks (solid line, the first peak: 8.33 V/g at 10 Hz; the second peak: 1.85 V/g at 88.1 Hz). The first peak corresponds to the cantilever fundamental and the second peak from body beam vibration. (b) The generated voltage peaks using an 8 cm long body beam (circles, the first peak: 6.45 V/g at 8.8 Hz; the second peak: 6.12 V/g at 55.8 Hz; the third peak: 5.64 V/g at 67 Hz), a 7 cm long body beam (triangles, the first peak: 6.63 V/g at 9 Hz; the second peak: 2.39 V/g at 63.2 Hz; the third peak: 0.51 V/g at 86 Hz), and a 6 cm long body beam (solid line, same as for (a)).
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