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Schematic structure of the vibration energy harvesting device based on air-spaced piezoelectric cantilevers.
(Color online) Picture of a prototype energy harvesting device mounted on the center of a speaker. The air gap between the two PZT plates can be observed. A commercial accelerometer was used to measure the acceleration.
Real-time output wave forms of the energy harvesting device (top) and the accelerometer (bottom) at a vibration of . A phase difference of about 90° can be observed.
(Color online) Frequency response of the prototype. The fitted second-order system model (solid line) shows that the resonant frequency is , the damping factor (open circuit) is 0.020, and the low frequency response is .
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