Broadband and high-efficiency acoustic energy harvesting with loudspeaker enhanced by sonic black hole

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-09-11 DOI:10.1016/j.sna.2024.115888

Qibo Mao, Lihua Peng

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引用次数: 0

Abstract

It is well-known that acoustic energy sources can be seen as a promising alternative energy resource by using acoustic energy harvester (AEH) which can transform sound energy into usable electrical power. However, the current AEHs have been restricted by their narrow bandwidths and low energy conversion efficiencies. In this study, a broadband and high efficient AEH is presented. The proposed AEH comprises an open-end sonic black hole (SBH) structure and an electrodynamic loudspeaker. The sound pressure is amplified through the open-end SBH structure, then the loudspeaker is used as electricity generator to convert acoustic energy into electric energy. The open-end SBH is a cylindrical tube with an array of regularly-spaced rigid-walled thin rings. The inner radii of the SBH rings are quadratically decreasing and the SBH effect can be obtained. The model for energy harvesting and sound absorption performance of the proposed AEH is then presented. Finally, the open-end SBH is fabricated by 3D printing apparatus. A prototype of the AEH is designed and tested by using an impedance tube. The energy conversion efficiency and absorption coefficient from calculation and experiment show a reasonable agreement. The proposed AEH can convert 11 % of total incident sound energy from 50 Hz to 800 Hz. The maximum energy conversion efficiency can achieve 65 % at 425 Hz under optimal resistance load. Furthermore, the broadband sound absorption can also be achieved by using the proposed AEH.

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利用声波黑洞增强扬声器的宽带高效声能采集技术

众所周知，利用声能收集器（AEH）可以将声能转化为可用的电能，从而将声能源视为一种前景广阔的替代能源。然而，目前的声能收集器受限于其狭窄的带宽和较低的能量转换效率。本研究提出了一种宽带、高效的 AEH。拟议的 AEH 由一个开口声波黑洞（SBH）结构和一个电动扬声器组成。声压通过开口式 SBH 结构放大，然后将扬声器用作发电机，将声能转化为电能。开口式 SBH 是一个圆柱管，管内排列着间隔规则的硬壁薄环。SBH 薄环的内半径呈二次递减，从而获得 SBH 效应。然后介绍了所提出的 AEH 的能量收集和吸声性能模型。最后，利用三维打印设备制作了开口式 SBH。利用阻抗管设计并测试了 AEH 原型。计算和实验得出的能量转换效率和吸收系数显示出合理的一致性。拟议的 AEH 可以转换 11% 的 50 Hz 至 800 Hz 的总入射声能。在最佳电阻负载条件下，425 Hz 时的最大能量转换效率可达 65%。此外，使用所提出的 AEH 还能实现宽带吸声。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.