Abstract
In this study, a novel acoustic energy harvesting (AEH) device is proposed to realize low frequency acoustic energy harvesting in broadband. Based on the classical Helmholtz resonator, a novel AEH device with slits is proposed. The AEH components and mechanisms are analyzed, followed by an experimental evaluation of the fabricated sample. Experimental results show that for the proposed AEH device, the bandwidth near the acoustic resonant frequency is extended, which can be attributed to the thermos-viscous damping mechanism. This type of attribute is favorable for resonance tuning and increasing the adaptability of the AEH device. Under 100 dB sound pressure level (SPL) excitation, the measured harvested electrical power is 2.4 µW.
Highlights
Acoustic energy, which belongs to one kind of environmental energies, is abundant around noise sources, such as power plants, aircrafts, fluid ducts, vehicles, railways, and factories
The wavelength of low frequency noise in air can be meters long, causing such type of noise to have a long propagation distance and having fewer restrictions that need to be considered for the acoustic energy harvester design
A novel acoustic energy harvesting (AEH) device is proposed in this study
Summary
Acoustic energy, which belongs to one kind of environmental energies, is abundant around noise sources, such as power plants, aircrafts, fluid ducts, vehicles, railways, and factories. The density of acoustic energy is low; an acoustic resonator is necessary to increase the incident sound pressure. This strategy can make the energy conversion part become sufficiently excited, which is favorable to improve the acoustical-electrical energy conversion efficiency. Previous studies show that if the mechanical resonance is tuned to be the same as the acoustical resonant frequency, the energy harvesting efficiency can be further improved. Making the AEH device has a larger resonant band can be a feasible solution to improve the device’s adaptability To solve this problem, a novel AEH device is proposed in this study. LOW FREQUENCY ACOUSTIC ENERGY HARVESTING ADOPTING SLIT HELMHOLTZ RESONATOR.
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