Functionally Graded Phononic Crystals with Broadband Gap for Controlling Shear Wave Propagation

Liu, Wenlong; Yi, Bing; Yoon, Gil Ho; Choi, Hyun Rim

doi:10.1002/adem.202000645

Cited by 8 publications

(2 citation statements)

References 42 publications

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“…Destructive interference [33][34][35], a type of interference in which two interfering waves have a displacement in opposite directions, emerges as a new direction to analytically design metastructure for flexural wave attenuation in a wide band gap, which is a class of simple but effective metamaterial for wave manipulation that has been theoretically and experimentally validated in practice [36]. Liu et al [37]. designed a onedimensional metastructure to manipulate shear wave propagation, and numerically and experimentally demonstrated the attenuation performance on transverse waves.…”

Section: Introductionmentioning

confidence: 99%

Mechanical metastructure with embedded phononic crystal for flexural wave attenuation

Liu,

Wan Kim,

Yoon

et al. 2024

Smart Mater. Struct.

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Destructive interference-based metamaterials have shown excellent characteristics in elastic wave manipulation and vibration attenuation. Nevertheless, challenges persist in the application due to limited space and lightweight design, as current metastructures require additional beam structure. To simplify the design of metamaterials for flexural wave manipulation, this paper presents a new class of embedded phononic crystal for manipulating flexural wave propagation in both one and two-dimensional space by taking advantage of destructive interference, which can effectively suppress the mechanical vibration of a beam structure with a broad band gap. The flexural wave dispersion characteristic in a non-uniform beam structure is derived based on the Euler–Bernoulli beam theory, and an embedded phononic structure with the mechanism of destructive interference is presented to demonstrate its effectiveness in mitigating mechanical vibration. Subsequently, four typical units of embedded phononic structures are designed for attenuating flexural wave propagation in a beam structure. Finally, both numerical simulations, including one and two-dimensional phononic crystals, and physical experiments are implemented to evaluate the performance of the presented metastructure for flexural wave manipulation, which indicates that the proposed embedded phononic structures can effectively mitigate structural vibration in the low-frequency domain. To the best of our knowledge, it is the first attempt to design the metabeam with embedded phononic structures by taking advantage of destructive interference.

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Section: Introductionmentioning

confidence: 99%

Mechanical metastructure with embedded phononic crystal for flexural wave attenuation

Liu,

Wan Kim,

Yoon

et al. 2024

Smart Mater. Struct.

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“…Metamaterials are artificially designed materials with unusual properties that originate from the rational design of their microarchitectures, which have been described in detail in the authors’ works [10–21]. In the past few years, with the emergence of metamaterials, research methods based on metamaterials have been rapidly developed in various fields, one of which is the research on mitigation measures of train‐induced ground vibrations.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial approach to mitigate ground‐borne vibrations induced by moving trains

Liu

Yan

et al. 2022

Applied Research

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The ground‐borne vibration generated by moving trains has become an important environmental problem. Research on mitigation measures has been uninterrupted for decades and has continued to grow rapidly in recent years with the emergence of metamaterial approaches. In this paper, to make relevant newcomers and researchers better understand the development status of mitigation measures in reducing train‐induced ground‐borne vibrations, a brief review is given of the background of train‐induced ground vibration problems, and the design mechanisms of train‐induced ground vibration mitigation measures based on metamaterials. Meanwhile, the results from state‐of‐the‐art research and practice are presented and discussed for each metamaterial mitigation measure for train‐induced ground vibration mitigation. Finally, the existing problems in previous research and future research prospects are summarized.

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Soft Phononic Crystal with Tunable Bandgap Through Pneumatic Actuation

Yi,

Liu,

Xiao

et al. 2024

Adv Eng Mater

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Pneumatic manipulation has the advantages of low cost, lightweight design, fast response, and ease of integration. However, its application in the field of phononic crystals remains limited. Inspired by pneumatic soft robots, this article proposes a pneumatic soft phononic crystal arranged in a square lattice, incorporating four pneumatic actuators within the scatterer. By manipulating air pressure, the bandgap can be effectively opened and closed. The finite element analysis is employed to examine the deformation and bandgaps of the pneumatic soft phononic crystal under varying air pressures. Moreover, the effect of the scatterer's rotation angle on the bandgap evolution in the phononic crystal is parametrically investigated. The results show that varying both the volume and the rotation angle of the scatterer can achieve bandgap opening, closing, and tuning. The proposed phononic crystal presents obvious practical applications and provides important insights for the design of soft‐tunable acoustic devices.

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Functionally Graded Phononic Crystals with Broadband Gap for Controlling Shear Wave Propagation

Cited by 8 publications

References 42 publications

Mechanical metastructure with embedded phononic crystal for flexural wave attenuation

Mechanical metastructure with embedded phononic crystal for flexural wave attenuation

Metamaterial approach to mitigate ground‐borne vibrations induced by moving trains

Soft Phononic Crystal with Tunable Bandgap Through Pneumatic Actuation

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