Abstract
Pressure pulsation from water hydraulic system exhibits great potential in vibration energy harvesting. Herein a novel hydraulic piezoelectric energy harvester is proposed, which exhibits excellent insulation and sealing performance. The effect of connection modes such as single output, series and parallel connection, on the energy harvesting performance is investigated at different parameters by the experiment. The theoretical analysis and simulation study are employed to explain the energy harvesting process. The results show that the transient voltage exhibits alternating characteristics, and it has the same period with the transient pressure. The piezoelectric disk closer to the liquid inlet has greater energy harvesting ability. The voltage increases as the static pressure rises and the main influence factor is pulsation amplitude rather than static pressure. Moreover, the root mean square voltage of series connection is highest, and it increases with the increasing resistance, but the average power first increases and then decreases. The parallel connection mode has higher average power and lower optimal resistance. The average power and power density can respectively reach 394 μW and 1.34 mW/cm3 under 3 MPa and 20 KΩ. This paper can provide methods for the sustainable power supply of sensors in water hydraulic system.
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