Flexural wave energy harvesting by multi-mode elastic metamaterial cavities

Ma, Tian-Xue; Fan, Quan-Shui; Li, Zhengyang; Zhang, Chuanzeng; Wang, Yue‐Sheng

doi:10.1016/j.eml.2020.101073

Cited by 53 publications

(25 citation statements)

References 31 publications

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“…Figure 3 shows the dispersion relation depending on the thickness of the X-shaped double bars in the frequency range below 10,000 Hz. To focus on flexural modes, the polarization ratio is defined as 19 where the notation denotes the complex conjugate and represents the entire volumetric domain of the unit cell. If the polarization ratio is close to 1.0 (colored red), the flexural mode is dominant, whereas if is close to 0.0 (colored blue), the mode is an in-plane mode for the z -direction.…”

Section: Resultsmentioning

confidence: 99%

“…To broaden the bandgap range, which is the sufficient condition of wave localization, Jo et al 17 designed a graded defect inside phononic crystal. In addition, to broaden the operating frequency of resonant defect, phononic crystals with double defect mode 18 or phononic crystals with multi-mode cavity 19 were proposed. Ma et al 20 presented a Helmholtz resonator-based metamaterial to induce a shift of the operating frequency.…”

Section: Introductionmentioning

confidence: 99%

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Extremely low frequency wave localization via elastic foundation induced metamaterial with a spiral cavity

Bae

Seung

2022

Sci Rep

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We proposed a metamaterial which exhibits elastic wave localization at extremely low frequencies. First, we opened an extremely low bandgap via elastic foundations. Subsequently, we investigated wave localization by imposing normal defect, which is widely used to capture waves in conventional wave localization systems. However, there were limitations: wave localization was not achieved when a weak bandgap is generated, and the operating frequency of localization is still in the upper part of the bandgap. To overcome wave localization via the normal defect, we proposed a novel metamaterial with a spiral cavity which can tune the resonating frequency depending on the length of the spiral path. By imposing on the spiral cavity inside the elastic foundation-induced metamaterial, we can shift the resonating frequency of the cavity down. Finally, we carried out wave simulations, not only to support the previous eigenfrequency study for the supercell, but also to verify that the finite-size metamaterial can also achieve wave localization at the extremely low frequencies. Through wave simulations, we could observe wave localization even at 77.3 Hz, which is definitely the lower part of the extremely low bandgap.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extremely low frequency wave localization via elastic foundation induced metamaterial with a spiral cavity

Bae

Seung

2022

Sci Rep

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“…The details In this work, we aim to harvest the energy of flexural waves. Therefore, to distinguish the flexural mode from the other wave modes, the polarization ratio α is defined as [32]…”

Section: Model and Analysismentioning

confidence: 99%

“…The harvested energy can be employed to power small electronic devices, e.g., wireless sensors. One strategy for designing energy harvesters is introducing point defects into a perfect PnC [30][31][32][33][34][35]. The elastic waves can be confined within the defects and hence the wave energy can be harvested by using piezoelectric materials.…”

Section: Introductionmentioning

confidence: 99%

Flexural wave energy harvesting by the topological interface state of a phononic crystal beam

Ma¹,

Fan²,

Zhang³

et al. 2021

Preprint

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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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Flexural wave energy harvesting by multi-mode elastic metamaterial cavities

Cited by 53 publications

References 31 publications

Extremely low frequency wave localization via elastic foundation induced metamaterial with a spiral cavity

Extremely low frequency wave localization via elastic foundation induced metamaterial with a spiral cavity

Flexural wave energy harvesting by the topological interface state of a phononic crystal beam

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

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