Sound energy harvesting using a doubly coiled-up acoustic metamaterial cavity

Sun, Kyung Ho; Kim, Jae Eun; Kim, Jedo; Song, Ki‐Hoon

doi:10.1088/1361-665x/aa724e

Cited by 64 publications

(38 citation statements)

References 28 publications

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“…The gain is a function of the design material, volume, frequency, and hydraulic fluid properties [ 7 ]. Space-coiled structures are of great interest for hydraulic applications and energy harvesting of acoustic noise in air due to their improved acoustic amplification performance [ 7 , 32 , 33 , 34 ]. In this study, a SCR is used to improve the performance of the PFEH for frequencies below 300

to avoid excessive static compressive forces on the transducer (without increasing the fluid-to-mechanical interface area).…”

Section: System Design and Implementationmentioning

confidence: 99%

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Aranda

Bader

Oelmann

2021

Sensors

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Condition monitoring devices in hydraulic systems that use batteries or require wired infrastructure have drawbacks that affect their installation, maintenance costs, and deployment flexibility. Energy harvesting technologies can serve as an alternative power supply for system loads, eliminating batteries and wiring requirements. Despite the interest in pressure fluctuation energy harvesters, few studies consider end-to-end implementations, especially for cases with low-amplitude pressure fluctuations. This generates a research gap regarding the practical amount of energy available to the load under these conditions, as well as interface circuit requirements and techniques for efficient energy conversion. In this paper, we present a self-powered sensor that integrates an energy harvester and a wireless sensing system. The energy harvester converts pressure fluctuations in hydraulic systems into electrical energy using an acoustic resonator, a piezoelectric stack, and an interface circuit. The prototype wireless sensor consists of an industrial pressure sensor and a low-power Bluetooth System-on-chip that samples and wirelessly transmits pressure data. We present a subsystem analysis and a full system implementation that considers hydraulic systems with pressure fluctuation amplitudes of less than 1 bar and frequencies of less than 300 Hz. The study examines the frequency response of the energy harvester, the performance of the interface circuit, and the advantages of using an active power improvement unit adapted for piezoelectric stacks. We show that the interface circuit used improves the performance of the energy harvester compared to previous similar studies, showing more power generation compared to the standard interface. Experimental measurements show that the self-powered sensor system can start up by harvesting energy from pressure fluctuations with amplitudes starting at 0.2 bar at 200 Hz. It can also sample and transmit sensor data at a rate of 100 Hz at 0.7 bar at 200 Hz. The system is implemented with off-the-shelf circuits.

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to avoid excessive static compressive forces on the transducer (without increasing the fluid-to-mechanical interface area).…”

Section: System Design and Implementationmentioning

confidence: 99%

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Aranda

Bader

Oelmann

2021

Sensors

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“…Sun et al [59] proposed a double coiled-up acoustic cavity for sound pressure enhancement. Inside the cavity, a piezoelectric bimorph plate is used for AEH.…”

Section: Established Aeh Approachesmentioning

confidence: 99%

Recent Developments of Acoustic Energy Harvesting: A Review

et al. 2019

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Acoustic energy is a type of environmental energy source that can be scavenged and converted into electrical energy for small-scale power applications. In general, incident sound power density is low and structural design for acoustic energy harvesting (AEH) is crucial. This review article summarizes the mechanisms of AEH, which include the Helmholtz resonator approach, the quarter-wavelength resonator approach, and the acoustic metamaterial approach. The details of recently proposed AEH devices and mechanisms are carefully reviewed and compared. Because acoustic metamaterials have the advantages of compactness, effectiveness, and flexibility, it is suggested that the emerging metamaterial-based AEH technique is highly suitable for further development. It is demonstrated that the AEH technique will become an essential part of the environmental energy-harvesting research field. As a multidisciplinary research topic, the major challenge is to integrate AEH devices into engineering structures and make composite structures smarter to achieve large-scale AEH.

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“…Later, the emergence of acoustic metamaterials with unconventional acoustical properties enables many extraordinary ways of sound wave manipulation 17–25 and offers new possibilities for enhancing the capability of acoustic energy harvesters with reduced sizes 26–36 . Effective acoustic energy harvesting can be realized by using planar acoustic metamaterials containing defects 34 or sandwiched between coiled metastructures 35 but with relatively bulky dimensions. The introduction of hybrid resonance into membrane-type acoustic metamaterials allows sound absorption and energy conversion with devices that have deep-subwavelength thickness but are mechanically fragile 36 .…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Planar Metasurface-based Acoustic Energy Harvester with Deep Subwavelength Thickness and Mechanical Rigidity

Jin

Liang

Yang

et al. 2019

Sci Rep

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Despite the growing attentions dedicated to the harvesting of acoustic energy that is a clean and renewable yet usually wasted energy source, the long wavelength of airborne sound still poses fundamental limits on the miniaturization of harvester devices and hinders practical applications. Here we present an ultrathin and planar acoustic energy harvester with rigidity. We propose a distinctive metasurface-based mechanism that reduces the effective wavelength to produce extraordinarily strong local energy within deep-subwavelength dimension and enable high-efficiently harvesting energy of incident airborne sound with considerably long wavelength. Our design idea is implemented by a foldy-structured metasurface capable of confining low-frequency energy within narrow channel at resonance, with a piezoelectric plate judiciously placed to converse acoustic to electric energy. The resulting device is downscaled to as thin as λ /63 while keeping flat shape and mechanical rigidity. We analytically derive the effective acoustical parameter of the unit cell, and verify the theoretical predictions via numerical simulations which shows the generation of the maximum output power at the prescribed working frequency. Our design with compactness and rigidity makes an important step towards the miniaturization and integration of acoustic energy harvesters and may have far-reaching implication in diverse applications ranging from microelectronic device design to wireless and self-powered active sensing.

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Sound energy harvesting using a doubly coiled-up acoustic metamaterial cavity

Cited by 64 publications

References 28 publications

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Recent Developments of Acoustic Energy Harvesting: A Review

Ultrathin Planar Metasurface-based Acoustic Energy Harvester with Deep Subwavelength Thickness and Mechanical Rigidity

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