Highly Localized and Efficient Energy Harvesting in a Phononic Crystal Beam: Defect Placement and Experimental Validation

Lv, Xu-Feng; Fang, Xiang; Zhang, Zhiqiang; Huang, Zhiyi; Chuang, Kuo-Chih

doi:10.3390/cryst9080391

Cited by 33 publications

(9 citation statements)

References 32 publications

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“…Finally, the extracted velocity amplitude at the cavity A c is divided by the amplitude at the shaker A s to obtain the amplification ratio for each cavity length of 60 mm, 80 mm, 100 mm, 120 mm and 140 mm. In general, impulse signal or frequency swap signal are used in such vibration experiments 31 . However, in the current metamaterial cavity, the leaky waves are involved so steady-state should be guaranteed for each frequency.…”

Section: Experiments and Validationmentioning

confidence: 99%

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Highly tunable low frequency metamaterial cavity for vibration localization

Park

Seung

2022

Sci Rep

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Metamaterial cavity has gathered much attention recently due to its capability of localizing vibration energy. Despite the active research, however, there are still big technical challenges not solved yet. Especially, there has been no approach to maximize the wave localization performance of metamaterial cavity; therefore, there has been a possibility that obtained cavity mode does not show sufficiently high performance. Also, there is a tunability issue that whole metamaterials should be re-designed to tune the cavity frequency. Here, we present the metamaterial cavity system that can control its cavity mode frequency from 589 to 2184 Hz by adjusting the cavity length from 140 to 60 mm without re-designing the whole metamaterial based on the broad bandgap. Also, the performance of the obtained cavity mode can be improved by adjusting the length of the side beam attached to the metamaterial; the displacements are amplified more than 18–110 times. Consequently, one may easily obtain the highly localized vibration energy at the desired frequency by adjusting two geometric parameters based on the proposed metamaterial cavity system. Numerical and experimental supports are provided to validate our new metamaterial cavity system. This metamaterial cavity system is expected to provide a guideline for localizing vibration energy in various applications, such as energy harvesting, sensing or vibration dissipation.

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Section: Experiments and Validationmentioning

confidence: 99%

“…Ma et al exploited the high order modes of the cavity on an aluminum phononic crystal to obtain multiple cavity modes at various frequencies with a single metamaterial 30 . Lv et al achieved two cavity modes at two separated bandgaps with a single phononic crystal consisting of aluminum and acrylic 31 .…”

Section: Introductionmentioning

confidence: 99%

Highly tunable low frequency metamaterial cavity for vibration localization

Park

Seung

2022

Sci Rep

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“…Jo and Youn [ 30 ] proposed an explicit solution for a one-dimensional PnC design based on these models that maximized the output voltage at the target frequency. Lv et al [ 31 ] and Park et al [ 32 ] conducted experiments to enhance the output electric power of one- and two-dimensional PnCs. Jo et al [ 33 ] numerically explored the effects of the supercell size and defect location on the PEH performance through a parametric study.…”

Section: Introductionmentioning

confidence: 99%

L-shape triple defects in a phononic crystal for broadband piezoelectric energy harvesting

Yoon

Shin

et al. 2022

Nano Convergence

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This study proposes a phononic crystal (PnC) with triple defects in an L-shape arrangement for broadband piezoelectric energy harvesting (PEH). The incorporation of defects in PnCs has attracted significant attention in PEH fields owing to properties such as energy localization and amplification near the defect. Several studies have been conducted to enhance output electric power of PnC-based PEH systems with single defects. However, it is susceptible to the limitations of narrow bandwidth. Recently, double-defect-incorporated systems have been proposed to widen the PEH bandwidth via defect-band splitting. Nevertheless, the PEH performance rapidly decreases in the frequency range between the split defect bands. The limitations of single- and double-defect-incorporated systems can be resolved by the incorporation of the proposed design concept, called the L-shape triple defects in a PnC. The isolated single defect at the top vertex of the letter ‘L’ compensates for the limitations of double-defect-incorporated systems, whereas the double defects at the bottom vertices compensate for the limitations of the single-defect-incorporated systems. Hence, the proposed design can effectively confine and harvest elastic-wave energy over broadband frequencies while enhancing the application of single and double defects. The effectiveness of the proposed design concept is numerically validated using the finite element method. In the case of a circular hole-type PnC, it is verified that the PnC with L-shape triple defects broadens the bandwidth, and improves the output voltage and electric power compared with those of single- and double-defect-incorporated systems. This study expands the design space of defect-incorporated PnCs and might shed light on other engineering applications of the frequency detector and elastic wave power transfer.

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“…Several prior efforts have been dedicated to analytical/numerical modeling [32][33][34] and experimental demonstrations [35][36][37] of enhanced PEH strategies that leverage a PnC with a single defect. However, inherent challenges exist in that the bandwidth for PEH is considerably narrow, since the defect-mode-induced energy localization and harvesting approaches examined in previous research can be performed only at a single defect band frequency.…”

Section: Introductionmentioning

confidence: 99%

A Phononic Crystal with Differently Configured Double Defects for Broadband Elastic Wave Energy Localization and Harvesting

Youn

2021

Crystals

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Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems to broaden the bandwidth. However, these prior studies are limited to examining an identical configuration of the double defects. Therefore, this paper aims to propose a new design concept for PnCs that examines differently configured double defects for broadband elastic wave energy localization and harvesting. For example, a square-pillar-type unit cell is considered and a defect is considered to be a structure where one piezoelectric patch is bonded to a host square lattice in the absence of a pillar. When the double defects introduced in a PnC are sufficiently distant from each other to implement decoupling behaviors, each defect oscillates like a single independent defect. Here, by differentiating the geometric dimensions of two piezoelectric patches, the defects’ dissimilar equivalent inertia and stiffness contribute to individually manipulating defect bands that correspond to each defect. Hence, with adequately designed piezoelectric patches that consider both the piezoelectric effects on shift patterns of defect bands and the characteristics for the output electric power obtained from a single-defect case, we can successfully localize and harvest the elastic wave energy transferred in broadband frequencies.

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Highly Localized and Efficient Energy Harvesting in a Phononic Crystal Beam: Defect Placement and Experimental Validation

Cited by 33 publications

References 32 publications

Highly tunable low frequency metamaterial cavity for vibration localization

Highly tunable low frequency metamaterial cavity for vibration localization

L-shape triple defects in a phononic crystal for broadband piezoelectric energy harvesting

A Phononic Crystal with Differently Configured Double Defects for Broadband Elastic Wave Energy Localization and Harvesting

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