Abstract
To harvest acoustic energy from urban railways, a novel and practical acoustic energy harvester is developed. The harvester consists of a piezoelectric circular plate and a Helmholtz resonator. Based on the field test data of urban railways, the resonance frequencies of the piezoelectric circular plate and the Helmholtz resonator are near 800 Hz. The Helmholtz resonator is designed to amplify the sound pressure. Thus, a lumped parameter model is established. The piezoelectric circular plate is used to convert mechanical energy into electrical energy. The simulation results show that the output power of the harvester is approximately 25 μW and the maximum voltage is 0.149 V under the excitation of urban railway noise. The experiment device is also developed. The maximum output power of the harvester is 8.452 μW, and the maximum voltage is 0.082 V. The experimental and the numerical results are in good agreement and demonstrate the effectiveness of the proposed acoustic energy harvester.
Highlights
Harvesting energy from the environment can generate power to drive low-power electronic devices, such as wireless sensors and health-monitoring sensors [1, 2]
A substantial amount of literature has focused on harvesting the linear or nonlinear vibration energy or the radiated noise caused by the structure vibration [4, 5, 9,10,11,12,13,14,15]
Urban railway noise can be reduced through sound absorption and prevention of sound propagation. us, a noise energy harvester must be developed to harvest wheel-rail noise and to drive some track monitoring equipment
Summary
Harvesting energy from the environment can generate power to drive low-power electronic devices, such as wireless sensors and health-monitoring sensors [1, 2]. E results show a maximum power of 0.19 μW with sound waves of 15 Pa (118 dB) at 850 Hz. Noh et al investigated piezoelectric (PVDF composite) cantilevers with Helmholtz resonators to harvest acoustic energy. An acoustic energy harvester with a piezoelectric generator and a Helmholtz resonator is developed to harvest high-speed trains’ noise in the passenger, cab, and between car sections [24]. A novel circular plate energy harvester with a Helmholtz resonator is developed to harvest acoustic energy from the urban railway systems.
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