Multiband elastic wave energy localization for highly amplified piezoelectric energy harvesting using trampoline metamaterials

Lee, G. S.; Park, Jeonghoon; Choi, Wonjae; Ji, Bonggyu; Rho, Junsuk

doi:10.1016/j.ymssp.2023.110593

Cited by 25 publications

(4 citation statements)

References 48 publications

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“…The proposed TREM controls phase‐shift by combining assembly‐components with different values of h m , which control the dispersive properties of the propagating elastic waves by introducing additional locally resonating oscillators (Figure 1c ). [ 30 , 31 ] Then, the interconnected meta‐slab with assembly‐components possessed individual phase‐shifting capabilities for each meta‐slab and was used for multifunctional wavefront manipulation through their configuration such as anomalous refraction, focusing, self‐acceleration, and total reflection (Figure 1d ). The multifunctional control of these features can be easily reconfigurable by replacing only assembly‐components on a fixed plate substrate.…”

Section: Design Strategy Of Tremmentioning

confidence: 99%

Timoshenko–Ehrenfest Beam‐Based Reconfigurable Elastic Metasurfaces for Multifunctional Wave Manipulation

Lee,

Choi,

et al. 2024

Advanced Science

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Herein, a Timoshenko–Ehrenfest beam‐based reconfigurable elastic metasurface is introduced that can perform multifunctional wave phenomena within a single substrate, featuring high transmission in the ultrabroadband frequency range. Conventional elastic metasurfaces are typically limited to specific purposes and frequencies, thereby imposing significant constraints on their practical application. The approach involves assembly‐components with various geometries on a substrate for reconfigurability, enabling to easily control and implement multifunctional wave phenomena, including anomalous‐refraction, focusing, self‐acceleration, and total‐reflection. This is the first study on elastic metasurfaces to theoretically analyze the dispersion relation based on the Timoshenko–Ehrenfest beam theory, which considers shear deformations and rotational inertia. The analytical model is validated by demonstrating an excellent agreement with numerical and experimental results. The findings include full‐wave harmonic simulations and experimentally visualized fields for measuring various wave modulations. Furthermore, the practicality of the system is verified by significantly enhancing the piezoelectric energy harvesting performance within the focusing configuration. It is believed that the reconfigurable elastic metasurface and analytical model based on the Timoshenko–Ehrenfest beam theory have vast applications such as structural health monitoring, wireless sensing, and Internet of Things.

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Section: Design Strategy Of Tremmentioning

confidence: 99%

Timoshenko–Ehrenfest Beam‐Based Reconfigurable Elastic Metasurfaces for Multifunctional Wave Manipulation

Lee,

Choi,

et al. 2024

Advanced Science

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“…Octagonal hole [13] Numerical + experiment 2.17 Cylindrical stub [14][6] Numerical 3.04 Trampoline [40] Numerical + experiment 2.8 Octagonal hole [24] Numerical + experiment 3.5 the wave propagation path, the distance has been set to 28 mm to ensure the efficient convergence of elastic waves. Next, the results of numerical simulations, calculated using COMSOL Multiphysics, demonstrate a significant enhancement in the wave-focusing effect of the coupled model.…”

Section: Defectmentioning

confidence: 99%

Design of phononic crystals using superposition of defect and gradient-index for enhanced wave focusing

Shen,

Cong,

et al. 2024

Smart Mater. Struct.

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This paper introduces a novel design strategy for phononic crystals (PnCs) that significantly enhances their wave amplification and focusing capabilities, making them highly suitable for energy harvesting applications. The strategy is based on the combination of two distinct wave tuning techniques: defect PnCs implementation and gradient-index (GRIN) structure designs. The two techniques are based on different mechanisms and are commonly considered independently for wave manipulation applications. In particular, defect PnCs incorporate structural or material irregularities within periodic PnCs, enabling waves of certain frequencies, typically blocked by the bandgap, to pass through and emerge with amplified amplitude at the defect location. In contrast, the gradient-index technique utilizes gradient structures that induce refractive effect to the wave propagation, focusing the wave at a pre-determined location. The PnC design strategy that we propose combines the wave amplifying effect of defect PnCs in conjunction with the wave focusing effect of the gradient-index mechanism. This combination leads to substantial performance improvement, with enhancement factors of 2.6 and 4.1, in comparison with individually implemented defect or gradient models, respectively. These results open up new possibilities for the development of PnCs with the goal of tuning wave propagations for optimized vibration energy harvesters.

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“…In 2000, Liu et al [18] reported local resonance phononic crystal, the structure can manipulate large wavelength acoustic energy by small size structure [19], broadening the study of low-frequency bandgap [20]. The emergence of the local resonance mechanism broke through the limitations of the traditional Bragg scattering bandgap [21,22] and promoted the research of the local resonance mechanism to generate the bandgap [23,24]. For example, He et al [25] proposed a column structure of locally resonant elastic metamaterial based on composite materials.…”

Section: Introductionmentioning

confidence: 99%

Auxetic hybrid metamaterial with tunable elastic wave bandgap

Chen,

Tao,

Luo

et al. 2024

Smart Mater. Struct.

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Auxetic metamaterials have shown good stability and uniform deformation capabilities against influences (vibration, temperature change, load change), making them significant in maintaining and adjusting the bandgap of phonon crystals. The low-frequency and broadband are the important goals of phonon crystals. For most traditional re-entrant honeycomb structures (T-RHS), the bandgap range is narrow and tunability is poor. Here, an auxetic hybrid structure with tunable acoustic bandgap (AHS-T) consisting of periodic mass inclusions integrated with traditional re-entrant honeycomb and chiral hybrid is proposed. Aiming at investigating the tunability of the bandgap in the low-frequency range. Compared with T-RHS, the bandgap real-time adjustment and wider bandwidth of the AHS-T be realized during compression and tension. The numerical results show that the bandgap of the AHS-T can be flexibly tailored by reasonably adjusting the strain and geometrical configurations of AHS-T. The bandwidth of AHS-T can be increased to 87.1% when the bottom diameter and column height H of the scatterer are changed reasonably. Moreover, the deformation behavior of auxetic material has an auxiliary effect on expanding the bandwidth. Compared with the structure which is not subjected to load, the adjustable amplitude of the bandgap is 41%. The findings of this work provide a design idea for manipulating elastic waves in dynamic environment.

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Multiband elastic wave energy localization for highly amplified piezoelectric energy harvesting using trampoline metamaterials

Cited by 25 publications

References 48 publications

Timoshenko–Ehrenfest Beam‐Based Reconfigurable Elastic Metasurfaces for Multifunctional Wave Manipulation

Timoshenko–Ehrenfest Beam‐Based Reconfigurable Elastic Metasurfaces for Multifunctional Wave Manipulation

Design of phononic crystals using superposition of defect and gradient-index for enhanced wave focusing

Auxetic hybrid metamaterial with tunable elastic wave bandgap

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