Tunable band gaps and double-negative properties of innovative acoustic metamaterials

Wang, Han; Cao, Shuai; Sun, Yongtao; Xin, Ya-jun

doi:10.1007/s00339-021-04612-8

Cited by 8 publications

(2 citation statements)

References 37 publications

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“…Due to the above advantages, numerous innovative AMMs structures have been devised. These designs encompass features such as negative equivalent mass density [10][11][12], negative equivalent elastic modulus [13][14][15], and double negative equivalent parameter characteristics [16][17][18]. Nevertheless, passive AMMs typically suffer from the drawback of narrow and fixed working band once they are fabricated.…”

Section: Introductionmentioning

confidence: 99%

A locally resonant metamaterial beam with tunable electromagnetic stiffness based on the electromechanical analogy network

Deng,

He,

et al. 2024

Smart Mater. Struct.

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Locally resonant acoustic metamaterials offer distinctive advantages in controlling low-frequency elastic waves. However, passive structures often face limitations due to narrow bandgaps and fixed working band once they are fabricated. This paper introduces a novel metamaterial beam with tunable bandgaps. This achievement is made possible by employing one electromagnet and three permanent magnets to create an electromagnetic spring. The initial stiffness, provided by the spiral beam, collaborates with the electromagnetic components to establish a local resonant unite cell featuring tunable composite stiffness. Subsequently, an analogy network is formulated for the metamaterial beam based on electromechanical analogy theory. This network not only elucidates the generation mechanism and regulatory principles of bandgaps but also serves as a paradigm for the proactive design of the metamaterial beam with external control sources, particularly under finite period conditions. Finally, theoretical analysis and experimental results collectively demonstrate the flexibility of the proposed metamaterial beam in effectively suppressing low-frequency elastic waves across a wide frequency range.

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Section: Introductionmentioning

confidence: 99%

A locally resonant metamaterial beam with tunable electromagnetic stiffness based on the electromechanical analogy network

Deng,

He,

et al. 2024

Smart Mater. Struct.

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“…The band-gap is the inherent property of elastic metamaterial structures [ 22 , 23 , 24 ], which can be used for passive control of structural vibration with the advantages of no external energy input, simple structure, strong reliability, good effect [ 25 , 26 , 27 ] and crack arrest and fracture resistance in the frequency region [ 28 ]. The frequency response functions (FRFs) are usually used to analyze the band-gap characteristics, and it is easy to directly judge whether the vibration can be effectively reduced within a certain frequency range by using the FRFs [ 29 , 30 ] or not. By designing the material and structural parameters, the positions and widths of band-gaps could be tuned to improve the vibration suppression ability of the metamaterial structures.…”

Section: Introductionmentioning

confidence: 99%

A Finite/Spectral Element Hybrid Method for Modeling and Band-Gap Characterization of Metamaterial Sandwich Plates

Linzhongyang

et al. 2023

Materials

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In this study, elastic metamaterial sandwich plates with axially deformed Timoshenko beam cores, considering both the out-of-plane and in-plane deformations of the face plates, are designed and the vibration band-gap properties are explored. The beam cores act as local resonators that can bear axial force, bending moment and shearing force. The finite element method (FEM) and the spectral element method (SEM) are combined to create the finite/spectral element hybrid method (FE-SEHM) for establishing the dynamic model and calculating the frequency response functions (FRFs) of the elastic metamaterial sandwich plate with axially deformed beam cores. It is observed that the metamaterial sandwich plate possesses both the axial and transverse vibration band-gaps of the beams, and the two kinds of band-gaps are independent. Compared with the metamaterial sandwich plates with rod cores, those with axially deformed beam cores have more extensive application ranges for vibration reduction.

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Innovative lightweight re-entrant cross-like beam phononic crystal with perforated host for broadband vibration attenuation

Ravanbod

Ebrahimi-Nejad

2023

Appl. Phys. A

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Tunable band gaps and double-negative properties of innovative acoustic metamaterials

Cited by 8 publications

References 37 publications

A locally resonant metamaterial beam with tunable electromagnetic stiffness based on the electromechanical analogy network

A locally resonant metamaterial beam with tunable electromagnetic stiffness based on the electromechanical analogy network

A Finite/Spectral Element Hybrid Method for Modeling and Band-Gap Characterization of Metamaterial Sandwich Plates

Innovative lightweight re-entrant cross-like beam phononic crystal with perforated host for broadband vibration attenuation

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