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

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical 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

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...