Abstract
Piezoelectric cantilever beams, which have simple structures and excellent mechanical/electrical coupling characteristics, are widely applied in energy harvesting. When the piezoelectric cantilever beam is in a wind field, we should consider not only the influence of the wind field on piezoelectric beam but also the electromechanical coupling effect on it. In this paper, we design and test a wind-induced flag-swing piezoelectric energy harvester (PEH). The piezoelectric cantilever beam may vibrate in the wind field by affixing a flexible ribbon to the free end as the windward structure. To fulfill the goal of producing electricity, the flexible ribbon can swing the piezoelectric cantilever in a wind-induced unstable condition. The experimental findings demonstrate that the flag-swing PEH performs well in energy harvesting when the wind field is excited. When the wind speed is 15 m/s, the peak-to-peak output AC voltage may reach 13.88 V. In addition, the voltage at both ends of the closed-loop circuit’s external resistance is examined. The maximum electric power of the PEH may reach 43.4 μW with an external resistance of 650 kΩ. After passing through the AC-DC conversion circuit, the flag-swing PEH has a steady DC voltage output of 1.67 V. The proposed energy harvester transforms wind energy from a wind farm into electrical energy for supply to low-power electronic devices, allowing for the creation and use of green energy to efficiently address the issue of inadequate energy.
Highlights
With the widespread application of low-power microelectronic devices in fields such as electronic information, artificial intelligence, aerospace, civil engineering, the machinery industry, and the engineering field, scientific researchers have begun to focus more on the devices’ longterm power supply
Based on the above research, a wind-induced flag-swing piezoelectric energy harvester (PEH) is proposed by pasting a flexible ribbon at the end of the piezoelectric cantilever beam in this paper, which makes full use of the mechanical energy contained in the wind field. e wind tunnel experiments were conducted to test and verify the reliability of the power supply performance of the flagswing PEH
When the wind speed in the wind field is 10 m/s, the vibration displacement of the flag-swing PEH measured with the laser displacement meter and the instantaneous output AC voltage waveform measured with the oscilloscope are as shown in Figures 5(a) and 5(b), respectively. e flexible ribbon pasted at the end of the piezoelectric cantilever can drive the piezoelectric cantilever to swing in the wind field so that the piezoelectric cantilever beam vibration can generate power, which can be found from the vibration curve in Figure 5(a). e waveform diagram in Figure 5(b) shows that the instantaneous AC voltage will be generated when the piezoelectric energy harvester swings from side to side and the maximum peak-to-peak AC voltage is 12.3 V
Summary
With the widespread application of low-power microelectronic devices in fields such as electronic information, artificial intelligence, aerospace, civil engineering, the machinery industry, and the engineering field, scientific researchers have begun to focus more on the devices’ longterm power supply. Shock and Vibration how to design, optimize, and improve the energy conversion from wind-induced mechanical energy to electrical energy using piezoelectric energy harvesters under the excitation of the wind field. When the speed of the water flow is 0.5 m/s, the output voltage of the piezoelectric sheet can reach 2 V. e working environment of this device is in water, while this piezoelectric power generation is suitable for the airflow environment. Li and Lipson [15] in 2009 investigated the practical application of energy recovery of piezoelectric cantilever beams under airflow conditions and designed a piezoelectric power generation device to harvest wind energy. Based on the above research, a wind-induced flag-swing PEH is proposed by pasting a flexible ribbon at the end of the piezoelectric cantilever beam in this paper, which makes full use of the mechanical energy contained in the wind field. Based on the above research, a wind-induced flag-swing PEH is proposed by pasting a flexible ribbon at the end of the piezoelectric cantilever beam in this paper, which makes full use of the mechanical energy contained in the wind field. e wind tunnel experiments were conducted to test and verify the reliability of the power supply performance of the flagswing PEH
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